Military Standard MIL-STD-781D, Reliability Testing for Engineering Development, Qualification and Production, 1986.
MIL-STD-781 17 October D 1986 SUPERSEDING MIL-STD-781C 21 October 1977 MIL-STD-1635(EC) 3 February 1978 MIL-STD-2068 (AS) 21 March 1977 MILITARY STANDARD RELIABILITY TESTING FOR ENGINEERING DEVELOPMENT, QUALIFICATION, AND PRODUCTION I I AMSC N3988 DISTRIBUTION AREA RELI STATEMENT A: Approved for public release; distribution is unlimited. Ml L-STD-781 D DEPARTMENT OF DEFENSE Washington, DC 20363-5100 RELIABILITY TESTING FOR ENGINEERING 1. This Milita~Standard DEVELOPMENT, isapproved foruseby QUALIFICATION, ANO PRODUCTION all Depa~ments and Agencies of the Oepaflmentof Defense. 2. Beneficial comments (recommendations, additions, beofuse inimproving thisdocurnent should beaddressedto: Systems Command, ATTN: Standardization Document by letter. deletions) andanypeflinent datawhich Commander, Space and Naval Warfare may SPAWAR003-121, Washington, DC 20363 -5100, byusing theself-addressed improvement Proposal (DDForm 1426) appearing attheend ofthisdocumentor =. ii MI L-STD-781”D FOREWORD 1. MIL-STD-781 Disacomplete revision of MlL-STD-781C. task basis and is fully coordi nated with MI L-STD-785. 2. [email protected]~ tasks which can beseleaed change tosuitthe Thisstandard isorganized onatailorable in MlL-STD-781 isthereorganization ofthisdocumerit intotailorable specific needs ofeach program. Thisstandard isintentionally stru~ured todiscourage indiscriminate blanket applications. seleaed andthatthe procuring aaiviNwill provide specified specified: (l) Test Planning and Control; Environmental Stress Screening. (2) Development Tailoring will ensure thatspecific tasks will be eswntial information. Four task areas are Testing; (3) ReliaMlity Accounting Tests;(4) 3. Thestatistical testplans andtest environments have beentransferred to MlL-HDBK-781, which will beissued simultaneously withthestandard. Thestandard testplanswhich were in MlL-STD-781 Carenow included in MIL-HDBK-781 without change except that thesufix letter Cattheend ofeachtest plan number has been changed toD. (Forexample, Test Plan lVCin MlL-STD-781 Plan IV-D.) .. Ill Cisincluded in Ml L-H DBK-781 as Test MIL-STD-781D CONTENTS ~ Paragraph 1. 1.1 1.2 1.3 2. 2.1 2.1.1 3. 3.1 SCOPE . . Purpose . . . . . Application. Equipment . . . . . . . categories . . . . . . . . . . . REFERENCECYDOCUMENTS DEFINITIONS Terms . . . . . . . . . . . . . . maintenance . 18.104.22.168 22.214.171.124 Producer’srisk Discrimination . 3.1.4 126.96.36.199 Failures . . ...”..... Multiple failures Pattern failures 188.8.131.52 184.108.40.206 3.1.5 220.127.116.11 3.1.5,2 18.104.22.168 22.214.171.124 . . . . . .. . . . . . . . . . . . . . . . . . . . . . . 1 1 2 . 2 2 3 3 3 3 3 3 3 3 3 . 3 3 . . .. . . . .. . . . .. . 3 3 3 3 3 4 . failure . 4 4 4 . MTBF interval 1 1 . . error failure of reliability Observed . . . . . . Demonstrated . . failure Part manufacturing 3.1.6 126.96.36.199 . design failure Software Measures . . . : Equipment manufacturing Part design failure 188.8.131.52 . . . . (a). ratio (d) 184.108.40.206 . . (repair) Chargeable failure Failure categories Equipment . . . . Decision risks Consumer’s risk @ . . . . . Corrective . . . . . . . . . .. 3.1.3 220.127.116.11 . . . . . . . . . . . . . Contractor . . . . . . . 3.1.1 3.1.2 . . . . . . . Government documents Standards and handbooks . . . . . . . (Od ) 4 . MTBF ($) 18.104.22.168 Lower Lest MTBF (6’1 ) 4 22.214.171.124 Upper 4 126.96.36.199 Predicted 188.8.131.52 Observed 184.108.40.206 Intensity test MTBF(80) 4 MTBF(I?P) cumulative function 220.127.116.11 Instantaneous 18.104.22.168 Observed failure (Pfi)) MTBF function reliability 4 rate (P(t)) 4 . . 4 (M(t)) 4 (R(t)) 4 3.1.7 Mission 3.1.8 Life-cycle profile 4 3.1.9 Procuring activity 5 4.. 4.1 profile 6 GENEf7iIL REQUIREMENTS Reliability test program 4.2 Integrated 4.3 Environmental reliability test planning test conditions iv . .. . . .. . . . . . . . . 6 6 6 “’.. - MIL-STD-781D CONTENTS Paragraph 4.3.1 22.214.171.124 126.96.36.199 188.8.131.52 184.108.40.206 220.127.116.11 4.4 4.4.1 4.4.2 4.5 4,5.1 - Continued Combined environmental Electrical stress. . Vibration stress Thermal stress . Moisture . . . . . . . . test conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . Calibration oftest apparatus Performance baselines . . . . . . . . . . . . 7 7 7 . . . 7 . . . . . . Failure 4.6.1 18.104.22.168 action system (FRACAS) Problem and failure action Problem and failure reporting 22.214.171.124 126.96.36.199 188.8.131.52 Identification and control of failed Problem and failure investigations Failure verification 184.108.40.206 220.127.116.11 4.7 Corrective action Problem and failure reporting, .. . analysis, . . . . . . . Chargeable failures Nonchargeable failures .,. 4.7.4 4.7.5 4.8 Alternate failure GEE..........:::: 6.3 6.4 . . and closeout . . 9 9 9 9 11 11 categories : 12 Taskdescriptions . . 9 II DETAIL REQUIREMENTS . 8 8 8 . . tracking 7 8 8 8 . NOTES 7 items . 6. 6.1 6.1.1 6.2 . and corrective Failure categories Relevant failures Nonrelevant failures 5.1 6 6 7 7 . 4.6 5. . . . . Pretest performance Performance during test POst-te5t performance 4.7.1 4.7.2 4.7.3 : 6 6 Equipment cycling Testinstrumentation and facilities Tolerance oftest environments 4,5.2 4.5.3 . . 12 . . . . . . . . . . . . . ...13 Tailoring of task descriptions Details to bespecified Method of reference 13 13 13 Data Item Descriptions Subject term (keyword) 13 14 (DID). listing TASKS TA5K SECTION Task 100. TEST PLANNING 101 INTEGRATED I 02 RELIABILITY AND CONTROL RELIABILITY TEST PROCEDURE v Iol-1 TEST PLAN DOCUMENT .“ 102- I 1, MI L-STD-781 CONTENTS D ~ Continued ~a~ Task 103 RELIABILITY GRQWTH 104 TEST PROGRAM 105 JOINT TEST GROUP 106 RELIABILITY PUNNING. . REVIEWS . Task 201 SURVEY TESTING 202 RELIABILITY OEVELOPMENT/GROWTH TASK SECTION 300. RELIABILITY ACCOUNTING Task 301 RELIABILITY QUALIFICATION 302 PRODUCTION 401. . . . 104-1 . 105-1 10G1 DEVELOPMENT Task . . TEST REPORTS TASK SECTION 200. TASK SECTION 400. 103-1 TESTING ... RELIABILITY . . . .. . TEST 201. .. 202-1 TESTS TEST ACCEPTANCE ENVIRONMENTAL STRESS SCREENING Environmental STRESS SCREENING 301- I TEST 302-1 401-1. FIGURES Figure I 103- I 401.1 Example of failure categories Reliability growth profile (example). Random vibration spectrum .-. vi 10 103-3 401-3 ‘“ ‘: , MIL-STD-781 D 1. SCOPE 1.1 Pur~ose. This standard dud ng the development, qualification, 1.2 Application. performed during specifies the general and production This standard integrated establishes test programs requirements and specific ta$ks for reliability testing of systems and equipment. the tailorable specified requirements in MIL-,STD-785. for reliability Task descriptions testing for Reliability DevelopmentiGrowth Testing (RD/GT), Reliability Qualification Testing (RQT), Production Reliability Acceptance Tests (PRAT), and Environmental Stress Screening (ESS) are defined. Tasks specified in this standard are to be selectively applied of work (SOWS), and Government equipment. 1.3 Equigment distinguished I categories. according procurements, developments This standard which is applicable requests require 1. Fixed ground. equipment Category 2. Mobile ground A. Wheeled to six broad categories equipment vehicle B. Tracked vehicle C. Shelter configuration D. Manpack Category 3. Shipboard equipment A. Naval surface craft B. Naval submarine C. Marine craft D. Underwater vehicle Category 4. Equipment for jet aircraft A. Fixed wing 1 Category 5. B. Vertical and short takeoff Turboprop aircraft A. Turboprop B. Helicopter I Category 6. external A. Air-launched missiles B. Assembled external stores missiles 1 (V]5TOL) equipment ‘“ Missiles and assembled C. Ground-launched and landing and helicopter for proposals, reliability to their field service applications Category I ‘ in DOD contracted in-house stores testing statements of systems and of equipment, MIL-STD-781 D 2. REFERENCED DOCUMENTS 2.1 Government 2,1.1 Standards documents. and handbooks. Unless otherwise of the issue listed in that issue of the Department specified in the solicitation specified, of Defense form a part of this document the following standards Index of Specifications to the extent specified and handbooks and Standards (DODISS) herein. STANDARDS MILITARY I MI L-STD-280 Definitions Of Item Levels, Item Exchangeability, MIL-STD-721 Definitions Of Terms For Reliability MI L-STD-785 Reliability Program. For Systems And Equipment Production MIL-STD.81 o MI L-STD-45662 Environmental Calibration Test Methods Models,.And Related Terms. And Maintainability And Engineering Development And Guidelines System Requirements HANDBOOKS MILITARY MIL-HDBK-189 Reliat$lity MIL-HDBK-781 Reliability Test Methods, Plans, And Environments Development, Qualification, And Production Gro~h Management ., For Engineering (Copies of standards and handbooks required by contractors in connection with specific functions should reobtained from theprocuringa ctivityora sdiretiedb ythecontractingo .. procurement fficer.) MI L-STD-781D 3. DEFINITIONS 3.1 ~. Terms used herein areinaccordance MI L-STD-785, MIL-STD-81O, and MI L-H D8K-189, with 3.1.1 through Military 3.1.9. 3.1. I Contractor. Contraaor systems and equipment. includes Governmental 3.1.2 Corrective maintenance item to a specified condition. 3.1.3 I Decision risks. 18.104.22.168 withatrue 22.214.171.124 MTBFequal thanthe i~. parameter$ ailures (MT8F)equalt Producer”srisk (a}. totheuppertest MT8F itistheratioof 126.96.36.199 MTBF asaresult in188.8.131.52 through (a) lessthan equipment less than equipment Pattern of accepting equipment with atrue witha true MTBFgreater (a). ratio (d)isone MTBF (Oo)toth:lower IJreS. Thesimultaneous failures. witha (fS). of thestandard test MTBF (t?l); test plan thatis. Failure types andclassificati onsarespecified in Ml L-STD-72l with and chargeable failures which are specified in 184.108.40.206 through 220.127.116.11. MU1tiDlefail torestorean 3.l.3.3. ofrejecting ofreje~ing Thediscrimination theuppertest of failure, orproducing (81 ). Theprobability istheprobabillty Theprobability developing ofaccepting (81 )willbe occurrence two or more failed parts are found during troubleshooting multiple failures are presumed to have occurred. 18.104.22.168 per formed, othelowertestMT8F .Producer’srisk (~o). activities risk (@ istheprobability thelowertest Discrimination ratio(d). 3,1.4 _. multiple, pattern, Theatiions Consumer’s MTBFlessthan upper test MT8Fwillbe 22.214.171.124 (rePair~. orindustrial Decision risks shall beasspecified Consumer’srisk true mean-time-between-f equipment with thedefinitions in MlL-5TD-280, MlL-STD-72l, the exception and addition of the terms specified in Theoccurrence oftwoor and failures oftwoormore failures theexceptionof more independent cannot be shown of thesame equivalent applications when the failures are caused by the same basic failure occur atarate which isinconsistent with the pans predicted failure rate. d=oo/@l. failures. When to be dependent, patiin identical mechanism or and the failures 126.96.36.199 Chargeable failure. Arelevant, independent failure ofequipment under testand any dependent failures caused thereby which are cla,s~ified as one failure and used to determine contractual ccsmpliance with acceptance andrejection criteria. 3.1.5 Failure categories. Failures shall becategorized as$pecified in188.8.131.52 through 3.l.5.5 184.108.40.206 Equi~mentdesiqn failure. Any failure which can betraced directly tothedesign of the equipment; that is, thedesign of the equipment caused thepati inquestion todegrade or fail, resulting an equipment failure. 220.127.116.11 manufacturing for example, 18.104.22.168 Equipment manufacturing process control the failure Partdesiqn during failure. equipment Afailure caused bypoorworkmanshi construction, testing, porinadequate or’repai rpriorto thestart obtesting; of an assembly due to cold solder joints. failure. The failure ofpa~Swhich 3 can betraced directly in toinadequatedetign I [ MI L-STD-781D 22.214.171.124 or inadequate Partmanufacturinq failure. Patimanufaduring failures aretheresult ofpoorworkmanship manufacturing process control during part assembly, inadequate inspection, or improper testing. 126.96.36.199 the hardware. 3.1.6 Software Measures error failure. ofreliabilitf. Afailurecaused Relia&lity byanerror measurement inthecomputer shall beasspecifi4 program in188.8.131.52 associated through 3.l.6.9. 184.108.40.206 Demonstrated MTBFinterval (Od): Demonstrated MTBFinterval (6’d) istheprobable of true MTBF under test conditions; that is, an interval estimate of MTBF at a stated confidence level. 220.127.116.11 Observed MTBF (jl. Observed equipment divided by the number of relevant 18.104.22.168 standard Lower test MTBF(6’1). test plans will reject, with MTBF (#) isequal failures. Lower test MTBF high probability, (81) tothetotal isthatvalue equipment with operating which with range timeofthe isunacceptabie. The a true MTBF that approaches (6? ). 22.214.171.124 UDpertest MTBF (00). Upper test MTBF (00) isanacceptable value of MTBFequal discrimination ratio times thelowertest MTBF (81). Thestandard testplanswill accept, withhigh probability, equipment withatrue MTBFthatapproaches [80). Thisvalue (f)o) shall berealistically attainable, based on experience and information. tothe 126.96.36.199 Predicted MTBF (8P). Predicted MTBF (8P) isthatvalue of MTBFdeterminedb yreliabiiity prediction methods; itisafbnction of theequipment design andtheusee~vironment. (Op) should be eq”alto orgreaterthan (00) invalue, tOensure,with high probaMbty, that theequipment will reaccepted during the reliability qualification test. 3. I.6.6 Observed cumulative failure rate( P(t)). Theobsewed. cumulative failure equal to the number of relevan’tsystern ‘failures N(t) accumulated by t, divided by t. 188.8.131.52 lntensitv function (P(tD. Theintensity expected value of N(t), thenumber ofsystem failures ra.te(p(t)) attim.?tis function (P(t) )isthechange perunittimeofthe bytim et. This is written as: P(t) = dE(N(t))/dt where E represents the expected value 184.108.40.206 instantaneous MTBFfunction reciprocal of the failure rate function. 3. I.6.9 for a specified Observed operating (M(t)l. Theinst.antaneous reliability (R(t)~. Apointestimate time, t, given that the equipment MTBFfunction attisequal ofreliab!lity equal totheprobability of survival was operational at the beginning of the period. 3.1.7 Mission profile, Ageneric definition isspecified in MI L-STO-721. Thisamplification definition applies to reliability test programs: A thorough description of all of the major planned conditions associated with one.specific mission. Amission pro file isonesegment example, amissile captive-carry phase oramissile free-f light phase). Theprofile event, the expected anitem environmental conditions, energized and nonenergized 3.1.8 Life-cvcleorofile. Athorough time-l ifedescription of equipment from thetime of final factory acceptance 4 tothe of that events and ofalife-cycle pro file (for depicts thetimespanofthe periods, and so forth. of theevents andconditions associated with until itsulti mate disposi tion (for example, .. MIL-STD-781D factory-to-target and checkout, including conditions, sequence). standby alternate Each significant life-cycle and ready modes, operational possibdities. and the operating The profile event, such astranspotiation, deployment, dormant and mission profiles, depicts the time span of each event, storage, test are addressed, the environmental modes. 3.1.9 Procurinaactivity. Asusedin t~sstandard, procuring or the prime contractor in transactions with their SUPPI iers. $ I I 5 aaivity refers tothe Government agency MI L-STD-781D 4. GENERAL REQUIREMENTS 4.} Reliability testproqram. Thereliatility and production tests in accordance with bytheprocuring activity. Thereliability foreachappropriate acquisition phase. 4.2 Integrated reliability testprogram shall reintegrated with other development the general requirements of this standard and the task(s) specified tests shall. deselected andtailored according tothetypeofitem and test planning. lnorder toavoid duplication oftesteffoti andtoensurethat deficiencies are not overlooked, the integrated reliability test plan document shall define procedures which ensure thatreliability data isderived from another tests required bycontract. Theintegrated testplanshall contain a description of the test plans selected for use, the decision risks, and the environmental test I conditions, and shall be keyed to the program and MIL-HDBK-781. life-cycle phases and the appropriate sections of this standard 4.3 Envircmmental testconditions. Theenvironmental testconditions to reapplied duting the test specified inthisstandard andthei rvariation with time shall berepresentati vedfthe field service and mission environment of theequipment 4.3. I Combined undervest. environmental Thisrequirement testconditions. doesnotapplyto Unless othen.vise ESS. specified 6ythe procuring activity, thestress types defined in4,3.1 .\through 220.127.116.11, shall becomblned inthesame chamber atlevelsand of change appropriate to the specified stress data. The combined environmental test conditions profile be developed in accordance with the guidance provided in MI L-HDBK-781, Section 5. rates shall 18.104.22.168 Electrical stre$s. Electrical stressshallincludee quipmentO N-OFFcyclin g,'operationin accordance with thespecified operating modes and'duty cycles, andinput voltage variation above and beiowthe I nominal 22.214.171.124 value specified Vibration stress: ‘ Vi bration test.levels orrandom); andprofiless themounting inthedefinition b) frequency hall betailoredt othespecifiedi range; c)amplitude; andd)manner for type (sine sweep, complex, aPPliCatiOfl. acharacter, environment Theintent ofthisrequ irement istoproduce intheequi pmenton test avibration respo"se with magnitude, frequency range, andduration similar tothatproduced bythe field service and mission profile. Themechanical impedance effects (the interaction ofequipment, fixtures, 126.96.36.199 Thermal stress. Thethermal stress profile shall bearealistic simulation of the actual thermal environment thatthe equipment experiences inthe service application. The minimum factors to be considered in the definition of thermal stress shall be; a) statiing temperature (heat soak, cold soak) and tum on (warm” P) time; b) operating temperature (range, rate of change, and frequency of change; C) Moisture, cycles permission Moisture profile; levels during andd)cooli thetemperature ngairflow (rate and fluctuation). cycles shall besufficient to produce visible condensation and frosting or freezing, when such conditions can beexpeaed infield service. The humidity should decontrolled during thetest cycle andmaybe increased toproduce the desired result by injecting water vapor at appropriate times in the test cycle. 4.3. I.5 Equipment of field operation, cyclinq. Equipment see MI L. HDBK-781, cycling imposed Section 5. 6 dutingreliability : .,. : ::. “. and axis of attachment structures, andshakers which would influence the laboratory simulation of the effects of vi bration environments) shall be,accounted forin. establishing vi bration level sfor all tests. As a minimum, the weight reduction criteria of MIL-5TO-81O, Test Method 514.3, shall be applied. 188.8.131.52 -“ .. ntended location and theclassificati on category ofrealistic vibration) stress shall bea) ofvibration oftemperature ~~ in thecontract. applicatiOn Oftheequipmen: andshall consider field use. Theminimum factors to beconside[ed number . . tests shall be representative ... , MI L-STD-781D 4.4 Test instrumentation and facilities. tests aredescribed in MIL-HDBK-781, with MIL-STD-45662. 4.4.1 tolerance Tolerance of test environments. of test environments and facilities used in conducting Sinusoidal, of test apparatus. stated the and tested in accordance in the equipment specification, in a and b: * 2“Celsius (C) (3.6”Fahrenheit b. Vibration amplitude: MIL-HD8K-781, Section 5. Calibration Unless otherwise shall be as specified a. Temperature: 4.4.2 Test instrumentation Section 6. These items shall be fully calibrated (F)), after thermal f 10 percent. The calibration Random, stabilization. as specified of instruments, in MIL-STD-810 test equipment, and and chambers used to control or monitor the test parametem shall be verified, periodically, in accordance with the requirements of MIL-STD-45662 and to the satisfaction of the procuring activity. All instruments and test equipment used in conducting the test shall be as specified in a through c: a. Conform to laboratory Standards of the U.S. Department b. Have a precision c. Be appropriate 4.5 Performance standards whose calibration of Commerce of at least one-third for measuring baselines. is traceable the tolerance the conditions Both performance to the National for the variable and reliability performancemeasurement, performance measurements, to be measured concerned shall be assessed in a test program statistically valid length under combined, cyclic, and time-varying environmental conditions expected in service use. This shall be accomplished by demonstrating baseline, through detailed completion of the detailed Bureau of of conditions which simulate an acceptable performance before the start of reliability testing. After selected performance test criteria shall.be used during the reliability test to ensure acceptable equipment performance. Unless otherwise specified by the procuring activity, all pretest and post-test measurements shall be performed at standard ambient conditions. Whenever standard ambient conditions must be controlled to obtain reproducible results, the measurements and tests shall be made using those tolerances measurement. Actual 4.5. I test conditions Pretest performance. the specified requirements be recorded to determine shall be recorded Prior to starting required during to obtain the test period, tests, the performance the desired whether precision controlled of or not. level of the test item relative shall be established under standard ambient conditions. Performance compliance with performance requirements and to provide reference to data shall levels or criteria for checking designed performance of the item during and at the conclusion of the test. The pretest performance check shall be made after installation of the item in the test facility. The conditions during the pretest check will be standard ambient unless otherwise specified. This test shall also be used to establish anomalies in system performance errors shall not be counted 4.5.2 Performance caused by malfunctioning as hardware durinq test. cycle. These data shall be compared considered acceptable during software. Identified and corrected software failures. Performance with data shall be recorded pretest and during-test the performance for the test item during performance check shall be those specified data. each test The conditions in the equipment specifications and in the test procedure. 4.5.3 Post-test performance. Performance data shall be recorded for the test item at the conclusion of the test. These daja shall be compared with pretest and during-test performance data and the specified requirements. the procuring 4.6 The conditions during the post-test will be standard ambient, unless otherwise specified by activity. Failure reportinq, analysis, and corrective used to collect data on, analyze, reliab~lity tests. The contractor’s action system (FRACAS1. A closed loop system shall be and record timely corrective action for all failures that occur during existing FRACAS shall be utilized with the minimum changes necessary to 7 I I MIL-STD-781D conform to the requirements of MI L-STD-785 and thisstandard. The system shall cover all test items, interfaces between test items, test instrumentation, test faci Iities, test procedures, test personnel, and the handling and operating instructions. 4.6.1 Problem and failure action. At the Occurrence of a problem or failure that affects satisfactory operation of the equipment, entries shall be made in the appropriate data logs and the failed equipment shall be removed from test with minimum interruption to the equipment continuing on test. 184.108.40.206 Problem and failure reportinq. A failure report shall be initiated at the occurrence of each problem or failure of contractor hardware and software, and Government-furnished equipment (GFE) (see 6.3). The report shall contain the information required to permit determination of the origin and correction of failures. The existing failure report forms maybe used with minimum changes necessary to conform the requirements of this standard and shall include the information specified in a through c: identification, a. Descriptions of failure symptoms, conditions and operating time (or cycles) at time Of failure. b. Information on each independent of the failure symptoms, the identification return the item to operational readiness c. Information describing of failure surrounding and dependent the failure, failure and the extent modes, and a description the results of the investigation, analysis of the item design, and the corrective action taken to prevent action is taken, the rationale for this decision shall be recorded. failed to hardware of confirmation of all repairaction taken to the analysis of all part failures, failure recurrence. an If no corrective 220.127.116.11 Identification and control of failed items. A failure tags hall be affixed to the [email protected] item . .. immediately upon the de:ekt~on of any, failure or suspected failure. The failure tag shall provide space for. the failure report serial number and for other pertinent entries from the item, failure record. All. failed parts shall be marked conspicuou:l y or tagged, and controlled to ensure disposal in accordance wi th contract requirements. Failed pare, shall not be.bandied in any manner which may obliterate facts which might be pertinent to the analysis, Failed par.ts.shall be stored pending disposition by theauthorized approval .,. . . . . .,, .. .. ... agency: of the failure analysis. 18.104.22.168 Problem and. failure investiqaticms. An investigation and analysis of each reported failure shall be performed. Investigation and analysis shall be conducted to the level of hardware or software necessary to identify causes, mechanisms, and potential effects of the failure. Any applicable method (that is, test, microscopic analysis, applications study, dissection, X-ray analysis, spectrographic analysis. and so forth) of investigation and. analysis which may be needed to determine failure cause shallbe used. When . . the removed item is not defective or the cause of failure is external to the item, the analysis shall be extended to include the circuit, higher hardware assembly, test procedures, and subsystem if necessary. Investigation and analysis of GFE failures shall be limited toverifyingthat the GFE failure was not the result of the contractor’s hardware, notification of the procuring software, activity. or procedures. This determination .-. shall be documented for 22.214.171.124 Failure verification. Reported failures shall be verified as actual failures or an acceptable explanation provided to the procuring activity for lack of failure verification. Failure verification is determined either by repeating the failure mode on the reported item or by physical or electrical evidence failure (leakage residue, damaged hardware, and so forth). Lack of failure verification, by itself, is not sufficient rationale to conclude of the absence of a failure. 126.96.36.199 Corrective actibn. When the cause of failure has been determined, a corrective action shall be developed to eliminate or reduce the recurrence of the failure. Repairs shall be made in accordance with normal field operating procedures and manuals. The procuring activity shall review the corrective actions at the scheduled status review prior to implementation. In all cases, the failure analysis and the resulting corrective actions shall be documented. The effectiveness of the corrective action should be demonstrated by restarting the test at the beginning of the te;t cycle in which the original 8 failure occurred. ,. ... ,,, ., ,, MI L-STD-781D include 188.8.131.52 Problem and failure trackina and closeout. The closed loop failure reporting system shall provisions for tracking problems, failures, analyses, and corrective actions. Status of corrective actions for all problems closeout 4.7 shall be reviewed at scheduled test status reviews. Problem and failure to assure their adequacy. Failure categories.. acceptance chargeable Failure and failures shall be reviewed All failures occurring during reliability qualification and production reliability tests shal I be classified as relevant or nonrelevant. Relevant failures shall be further classi fied as or nonchargeable. Rules for classification of failures shall be in agreement with the approved Definition classifications 4.7.1 and Scoring Criteria. Relevant failures. a. Intermittent b. Unverified or for which Relevant failures activity of failure shall be as specified Nonrelevant excluded which d: are still under investigation, under 4.7 failures. Nonrelevant failures shall be as specified in a through g: damage b. Accident or mishandling c. Failures of the test facility or test-peculiar d. Equipment test requirements e. Normal in a through fai Iures a. Installation approved will make the final determination failures failures (failures which cannot be duplicated, no cause could be determined) c. Verified failures not otherwise d. Pattern 4.7.2 The procuring (see FIGURE 1). failures operating instrumentation caused by an externally adjustments applied (nonfailures) overstress specified condition, in the approved in excess of the equipment operating instructions f. Secondary relevant failures within the equipment, primary failures. The secondary failures g. Failures caused by human errors 4.7.3 Chargeable failures. a. Intermittent Chargeable failures caused by nonrelevant to be dependent shall be as specified on the prima~ in a through or failure d: failures b. Unverified or verified c. Independent failures 1. Equipment design failures 2. Equipment manufacturing 3. Part design 4. Part manufacturing verification, which are directly must be proved .. 5. Software errors identified, corrected, and verified during and the test, shall not be chargeable as equipment failures 6. CFE (operating, d. Relevant failures maintenance, or repair procedures 9 the pretest, the system that cause equipment failures) I MI L-STD-781D INCIDENT FAILURE WHICH CAN EXPECTED TO OCCUR CLASSIFIED NONRELEVANT 8E IN FAILURE OF CFE (SEE NOTE) PLUS ANY DEPENDENT FAILURES ‘o.. YES =, + CLASSIFIED CHARGEABLE NOTE: Contractor-furnished equipment FIGURE 1. Exam~leof failure 10 cataqories. ?- ,,., MI L-STD-781D 4.7.4 Nonchargeable failures. a. Ncmrelevant failures Nonchargeable failures shall be as specified in a through c: b. Failures induced by GFE operating, maintenance, or repair procedures c. Failures of items having.a specified life expectancy and operated beyond the specified replacement time of the item 4.7.5 Alternate used to categorize by embedded failure categories. both hardware The alternate and software failure failures categories specified for systems the operations in a through c can be of which are controlled software. a. Critical failure is a failure which prevents the system from performing its mission b. Major failures areas specified in 1 through 6: .1. Any failure which reduces performance of on-line hardware or software so that the system mission capability is degraded but not eliminated 2. Any failure which prevents”built-in test equipment on-line hardware or software software hardware or software 3. Any failure which causes BITE to continuously major failures to the lowest group 5. Any failure which causes BITE to continuously c. Minor failures 1. Any failure 4,8 to isolate and localize ~. Equipment, contract. Reliability be tested. to the required facilities, and localizing furnished or software (creates on-line performance, false alarms), false alarm major failures in on-line hardware or. in on-line level but permits’the but permits BITE, when rate exceeds specified will be specified for any GFE included in hardware a major failure the specified by the Government by the Government 11 failure isolate and localize level, except when and material test data will be provided a major rate to exceed are as specified in 1 and 2: which impairs on-line hardware system to fully perform mission 2. Any failure which impairs BITE performance recycled, indicate when such a failure does not exist 4. Any failure which prevents BITE from isolating or software when such failure does not exist 6. Any failuie which causes BITE false alarm (BITE) from detecting level in the in the equipment to I I MI L-STD-781 D 5. DETAIL REQUIREMENTS 5.1 Task descriptions. Task descriptions Planning and Control; Section 200, Development Section 400, Environmental Stress Screening. are divided Testing; into four general .-. 12 tasks: Section Section 300, Reliability Accounting 100, Test Tests; and MI L-STD-781D 6. NOTES 6.1 Tailoring of task descriptions. as required by governing regulations, type, magnitude, and funding. 6.1.1 Details to be spe~ified. The task descriptions and as appropriate, specified herein to the particular The Details to be specified by the procuring each task description specifies the details, additions, modifications, deletions, of the task that should be considered by the procuring activity when tailoring program needs. Detai Is annotated by an asterisk (*) are essential proper implementation of the task. 6.2 Method of reference. When specifying are intended activity program paragraph under or options to the requirements the task description to fit and shall be provided the task descriptions to be tailored system or equipment, to the contractor of this standard as requirements, both the standard and the specific task description number(s) shall be cited. Applicable information required for the Details to be specified by the procuring activity paragraph of each task shall be included the SOW. 6.3 Data Item Descrirstions (DID1. When this standard is used in an acquisition for which in incorporates a DD Form t 423, Contract Data Requirements List (CDRL), the data requirements speci fied for Task 101 through Task 401 shall be developed as specified by an approved DID (DD Form 1664) and delivered in accordance’with the approved CDRL incorporated into the contract, When the provisions of DOD FARSUP 52.227-7031 are invoked and the DD Form 1423 is not used, the data specified for Task 101 through Task 401 and 4.6 shall be delivered by the contractor in accordance with the contract or purchase order requirements. Deliverable data required by this specification are: DATA REQUIREMENT ~ APPLICABLE 101 DI-RELI-80250 Reliability Test Plan 102 DI-RELI-80251 Reliability Test Procedures 103 DI-RELI-80250 Reliability Test Plan 106 DI-RELI-80252 Reliability Test Report 201 DI-RELI-80247 DI-RELI-80248 Thermal Suwey Report Vibration Survey Report 202 DI-RELI-80250 DI-RELI-80251 DI-RELI-80252 DI-RELI-80253 DI-RELI-80254 DI-RELI-80255 301 DI-RELI-80250 DI-RELI-80251 DI-RELI-80252 DI-RELI-80253 DI-RELI-80254 DI-RELI-80255 DID ‘ Reliability Test Plan Reliability Test Procedures Reliability Test Report Failed Item Analysis Report Corrective Action Plan Failure Summary and Analysis Report Reliability Test Plan . Reliabi Iit y Test Procedu res Reliability Test Report Failed Item Analysis Report Corrective Action Plan Failure Summary and Analysis 13 Report . r MI L-STD-781 302 DI-RELI-80250 DI-RELI-80251 DI-RELI-80252 DI-RELI-80253 DI-RELI-80254 DI-RELI-80255 I I 401 DI-RELI-80249 DI-RELI-80250 DI-RELI-80251 DI-RELI-80253 DI-RELI-80255 Paraaraph 4.6 6.4 I I I I D;-RELI-80253 DI-RELI-80254. Subiect term (kev word) D Reliability Test Plan Reliability Test Procedures Reliability Test Report Failed Item Analysis Report Corrective Action Plan Failure Summary and Analysis Environmental Stress Screening Reliability Test Plan Report Reliability Test Procedures Failed Item Analysis Report Failure Summary and Analysis Failed Item Analysis Corrective Action Report Plan Iistinq. Built-in test (BIT) Built-in test equipment (BITE) Development Testing Tasks Environmental Stress Screening (ESS) Tasks Failure reporting, analysis, and.correctiv.e action (FF&CAS) Production Reliability Acceptance Tests (PRAT) Reliability Accounting Tests Tasks ~. , Reliability Development/Growth Testing (RD/GT) Reliability Qualification ?esting(RQT). Test Planning and Control Tasks .: ,, Custodians: Army - CR Navy. EC Air Force- 11 Report Preparing activity: Navy - EC (Project No. RELI-0025) Review activities. Army - CR, Ml, AR, AV Navy -AS, SH, OS Air Force-01, 10, 13, 16, 17, 18, 19 User activities: Army - AR, ME I 14 Report TASK SECTION TEST PLANNiNG ,,. , ... AND . -. 100-1 100 CONTROL: MI L-STD-781 D TASK 101 INTEGRATED 101.1 PurDose. The purpose which identifies the reliability. reliability test program. 101.2 integrates Task description. all tests that provide 101.3 ● * * equipment . Reliability Corrective * An integrated by the contract reliability data for evaluating the information TEST PIAN of TASK 101 is to develop tests required Details to be specified SOW shall include RELIABILITY an integrated and integrates activitv in a through reliability them (see 6.1.11. The details and (see 6.3). to be specified in the f, as applicable: of the reliability b. Identification c. Identification of the contra~ual status of the integrated reliability of the life-cycle, mission, and environmental profiles of MI L-STD-785 which identifies of systems and equipment a. Identification usage in service d. Identification test plan document into a comprehensive test plan shall be prepared the reliability bv the wocurinq specified DOCUMENT test tasks tasks for use i.n support test plan document which represent of the reliability test program (that is, Predictions, Failure Mode Effects, and Criticality Analysis (FM ECA), Failure Repofling, Analysis, and Action System (FRACAS), and so forth) e. Specification of alternate failure categories f. DI-RELI-80250, Reliability Test Plan, applies to this task and shall be specified when required as a deliverable data item “Essential -. 101-1 MI L-STD-781D TASK 102 RELIABILITY 102.1 Purpose. The purpose of TASK 102 is to develop reliability test procedures for each tesl included in the integrated reliability test plan document 102.2 Task description. A separate reliability integrated reliability test plan document (see 6.3). 102.3 Details to be specified SOW shall include ● ● TEST PROCEDURE the information bv the grocurina specified after its approval by the procuring activity. test procedure activity in a through shall be prepared for each test in the (see 6.1.1 ~. The details to be speci fied in the f, as applicable: a: Identi;cation b. Identification of contractual of equipment status of reliability test procedures to be used forreliabilityqualification testing c. Identification of equipment and quantity development to be used for reliability and growth testing ● * required d. Details of hardware configuration and system operation under test e. Performance parameters to be monitored during the test f. DI-RELI-80251, Reliability Test Procedures, applies to this task and shall be specified as a deliverable data item ‘Essential ,, . .. .. 102-1 when MI L-STD-781D TASK 103 RELIABILITY 103.1 Purpose. The purpose GROWTH PIANNING of TASK 103 is to develop a reliability specifies the plan for achieving. specified reliability values and which growth and monitoring progress as the test proceeds. 103.2 Task description. to indicate what the reliability the reliability requirement growth provides planning curve whkh a means for tracking reliability A graphically portrayed reliability growth planning curve shall be prepared value should be at various points in full-scale development if conformance to is to be achieved. 103.2.1 Reliability a rowth Dlannina curve development. development shall be based on data from previous development The reliability growth planning curve programs for items of the same type being developed. These data shall be analyzed to determine the length of the reliability growth test period and to provide project management with a meansof monitoring progress during test (see 6.3). Detailed guidelines are provided in MIL-HDBK-189. 103.2.2 rowth Reliabilitva curve preparation. The reliability growth curves shall be prepared as point estimates of each reliability parameter specified (that is, system MTBF, mission MTBF, probability of success, and so forth) for the entire system and each major subsystem, as specified by the procuring activity. The vertical axis of the graph shall portray cumulative values of the reliability parameter of the system or major subsystem and the horizontal axis shall be in units of both calendar time and test time. shall be clearly indicated. A growth curve is shown in FIGURE 103-1. Each test planned rowth curve startinq point. 103.2.3 Reliabilitva Planned growth curves shall depict planned levels of reliability achievement at specific points in calendar time and test time and shall be coordinated with the scheduled reliability program reviews. Values along the planned growth curve shall represent the planned reliability improvement as measured by a point estimate. The MTBF value indicated by the planned gro~h curve at the end of any test program (for example, RD/GT in FIGURE 103-1) should be achieved or exceeded at or before the end of that test program. The starting point for the planned growth curve shall be determined: 1) from information of previous programs on similar systems; 2) by specifying a minimum level of reliability engineering which must be achieved to conform to the specified requirements; assessment of the design and any previous development test data. or 3) by conducting an If historical data are unavailable, the starting point maybe estimated by applying a constant factor (K) (that is, 10 percent, 15 percent, and so forth) to the reliability predicted for the mature system. Every effort should be made, however, to obtain information relevent to a realistic starting point prior to applying a K. A second curve, called the Adjusted Growth curve, which reflects the level at which the achieved corrected failures were discounted, may also be provided. =. 103.2.4 growth Predicted reliability rate that is predicted rowth between rate, been derived from historical data from similar with the present program shall be specified. 103.3 contract . ● Details to be specified shall includq the information a. Identification b. Identification c. Imposition Engineering the scheduled programs, bv the procuring specified review rationale activitv in a through shall he provided points. When these programs [see 6.1 .1). the predicted the requirement curves 103-1 would The details be if the for the reliability growth and the similarities curves have and differences to be specified in the e, as applicable: of contractual status of the reliability growth of majOr subsystems which require reliability of TASK 101 with reliability to incorporate planning curve growth planning the reliability curves growth planning MIL-STD-781D . d. Termination e. DI-RELI-80250, as a deliverable data item criteria for test Reliability Test Plan, applies to this task and shall be specified ●Essential 103-2 when required w o w 25 50 75 100 125 I SVSTEtA/lTEM: NUMBER: OATE: ,ED,CTCD so ,~UAL M ICNAL. “MULATIVE 30 ~ EDT ROIGT D1 II 01 II 07111 01 Ill ‘ESTPROGRAM VEAR(CY) I)TR MTBF (HRS) 150 175 200 225 250 ,70 I00 Es I 300 IOQ I10 3 OXVZACORADAR gooooo 15 JULY1985 so 10 2 so 70 1 ADJUSTEDGROWT~ PREDICTEDVALUE 450 ‘on tso 13 2 86 I A son A FIGu REI03-1. REMARK’: 700 300 150 1 A’” ~ 4 “0 Reliablityq ‘m .3 1 rowth 1‘m 2 87 profile lW J. I b (exam ,Cm 1 88 Dle~ ,Sm 2 — 1000 0 0 1SW I500 I500 89 0 MI LJSTD-781D TASK 104 TEST PROGRAM 104.1 Purpose. reviews at specifed milestones. 104.2 The purpose of TASK 104 is to establish ti mes to erwtcre that reliability Task description. REVIEWS The reliability a requirement tests are proceeding test program to conduct i n accordance shall be planned test program with contractual and scheduled to permit the review of test status. Formal review and assessment of contract test requirements shall be conducted at major program points as specified by the contract. Progress of individual tests shall be assessed by test status reviews. Test reviews shall be scheduled with subcontractors aa”vity shall be informed in advance of each review. and vendors as appropriate. The procuring 104.2.1 Test readiness reviews. To assure that the test item and all supporting elements are ready at the start of the test, a test readiness review shall be planned and scheduled at least 7 days prior to the start of any test. 104.2.2 Pretest readiness review. (This review shall be conducted when specified for U.S. Army procurements). After the procuring activity approves the reliability test procedure and before start of the shajl be convened at the contractor’s test facilitY to ‘eview reliability test, a reliability test readiness review the test prerequisites and to ensure that all test requirements specified in the apprOved test Plan and test procedures are compatible and understood by all parties. The contractor shall notify the procuring activity a minimum of 10 days before conduct of the review. documented by the contractor and made available of the test. The results of the pretest readiness review shall be to the procuring activity at least 2 days prior to the start 104.2.3 Status reviews. Formal reviews shall be scheduled as preplanned milestones during the reliability tests to permit the review of testing status and the results achieved to date. The status reviews shall be scheduled in accordance with the contract and shall consider, but not necessarily be limited to, the information specified in a through g: a. Current reliability assessments and projections based on test results b. Results of current problem and failure investigations and engineering c. Preventive and corrective action recommendations d. Potential design problems based on the preventive and corrective analysis action recommendations e. Status of subcontractor and supplier, or both, reliability development tests f. Status of previously assigned acQ.on items g. Assignment of action items resulting from the review including scheduled completion dates 104,2.4 Test completion review. test. This review shall be conducted specified in a through A test completion to evaluate review shall be conducted at the completion the results of the test and shall consider the informati of the on f: a. Current reliability growth assessments and achievements b. Status of open problems and failures c. Status of preventive and corrective actions d. Status of previousl y assigned action items e. Assignment of action items resulting from the review, dates f. Conclusions of the review 104-1 based on test results .: including scheduled completion MI L-STD-781 104.2.5 As specified by the procuring activity, D the contractor shall document each review. 104.3 Details to be specified bv the procurinq activitv (see 6.1.l\. Details to be specified contract shall include the information specified in a through e, as applicable: . ● ~ a. b. A record of the results of each review The speci fic number of days advance notice c. Identification of advance d. Identification of procuring e. Delivery for test readiness and pretest in the readiness reviews notification for other scheduled a’ctivity and contractor items identification of any data item required ●Essential 104-2 follow-up reviews methods on review of open MI L-STD-781 D TASK 105 JOINT TEST GROUP 105.1 provide Purgose. coordination 105.2 The purpose throughout Task description. of TASK 105 is to require. the establishment the reliability test program The JTG shall periodically and to periodically review of a joint test group (JTG) to review test data including all test data. subcontractor qualification, and acceptance test data (see 6.3). The JTG also shall approve on the spot changes previously approved preventive maintenance schedules and detailed test procedures. 105.2.1 JTG membership. The membership of the JTG shall be comprised of Government reliability, to and contraflor personnel and shall be chai red by a Government representative. Contractor JTG members shall include appropriate representatives from design, reliability, system safety, test, parts, and quality assurance activities. Additional contractor or Government personnel may 15eassigned as temporary members for special tasks, as required. 105.2.2 Specific JTG tasks. to, the tasks specified a. b. schedules malfunction nonrelevant in a through Conduct Approve Specific tasks to be performed by the JTG shall include, but not be limited e: periodic review of all test data on the spot changes t~ all previously approved preventive maintenance and detailed test procedures c. Review and approve all corrective action recommendations generated as a result of . report5 d. Approve recommended classifications of malfunctions and failures as relevant or during the reliability qualification or production reliability acceptance tests e. Approve acceptance recommendations audit of all documentation at the end of the test to affirm at the completion of the test and conduct compliance with contractual requirements 105.3 Detail$ to be soecified bv the mocurinq activitv contract shall include the information specified in a through of Government (see 6.1. 1). Details d, as applicable: a. Identification b.. c. d. Identification of additional tasks Recording of the results of the tasks Delivery identification of any data items required representatives 105-1 to be specified in the an MI L-STD-781D TASK 106 RELIABILITY TEST REPORTS 106.1 Purpose. The purpose of TASK 106 is to establish a requirement for the preparation of reli abtlity test reports whjch summarize reliability test results obtained to date and other pertinent information. 106.2 Task description. Periodic summary and final test reports shall be prepared to summarize test results obtained. The test reports shall include summaries of failures, failure analyses, and recommended or implemented corrective actions. 106.2.1. Final reliability equipment reliability. charts or graphs with against test time. 106.3 contract ● required test reDort. Details to be specified shall include The final reliability test report shall include a general analysis of A summary of pertinent data and information shall be presented including applicable test data plotted thereon, failures plotted against time, and observed MTBF plotted the information a. Identification bv the procurina specified of tests which b. Delivery schedule c. DI-RELI-802S2, Reliability as a deliverable data item activitv in a through require Test Report, (see 6.1. 1). Details to be’specified in the c, as applicable: final test reports applies ●Essential 106-1 to this task and shall be specified when MI L-STD-781 D ... ! TASK SECTION 200 DEVELOPMENTTESTING 200-1 MIL-STD-781D TASK 201 SURVEY TESTING 201.1 that thermal Purpose. The purpose of TASK 201 is to establish and implement survey testing stabilization and resonant conditions of the equipment can be determined. 201.2 Task description. Thermal and vibration survey testing equipment to determine the level of equipment thermal stabilization procedures so shal( be conducted on a sample of the and to search for resonant conditions and design weaknesses. Thermal andwibration suweys shall be performed prior to the start of reliability growth testing and, when specified, prior to reliability qualification testing and environmental stress screening (ESS). Equipment selected for reliability specifically authorized by the procuring activity. testing shall not be used for survey testing unless 201.2. I Thermal survey. A thermal survey shall be performed on one sample of the equipment to,be tested, under the temperature and duty cycle specified in the reliability test procedures. The thermal survey shall be used to identify hot spots and the component of greatest thermal inertia, andto establish the timetemperature relationship between the equipment and the chamber air. These relationships shall be used to determine the Ievet of equipment thermal stabilization. The 10wer test level [email protected] $ta~lizatiOn. occurs when the temperature of the point of the maximum thermal inertia is within 2°C of the lower test level temperature or the rate of change is less than 2-C per hour. Upper test level temperature stabilization occurs when the temperature of the maximum thermal inertia point is within 2°C of the upper temperature level or the rate of change is less than 2-C per hour. Temperatures of equipment cooling air and chamber air shall be recorded continuously .during both. the.survey and the tests. Should the results of the thermal survey indicate local temperatures significantly higher than those predicted by the final thermal design analysis or greater than those used for derating in the reliability prediction, corrective action shall be accomplished, verified, and approved prior to the start of reliability testing. 201.2.2 Vibration survey. A vibration survey shall be per forrned,on one sample of the equipment to be tested to search for resonant conditions and design weaknesses. Unless otherwise specified by the procuring activity, the vibration conditions shall be those specified in the reliability test procedures. Any failures which occur during vibration survey testing shall be reported, investigated, and analyzed and corrective action shall be accomplished, verified, and approved prior to the start of reliability Equipment mounting for the vibration survey shall simulate mounting in actual use. 201.3 Details to be mecified bv the mocurina activitv (see 6.1. 1~, Details contract shall include the information specified in a and b, as applicable: reliability a. Identification test procedures b. DI-RELI-80247, this task and shall be specified of vibration and temperature conditions if other than specified Thermal Survey Rep6rc, and DI-RELI-80248, when required as deliverable data items 201-1 to be specified Vibration for cause; testing. in the in the Survey Report, apply to MIL-STD-781D TASK 202 RELIABILITY 202.1 =. DEVELOPMENT/GROWTH The purpose of TASK 202 is to conduct also known as test, analyze, and fix (TAAF), which incorporating corrective actions into the design. 202.2 identification, a reliability developmentfgrowth a basis for resolving reliability performance of design corrections minimize 202.2.1 (see 4.3) applied 184.108.40.206 which Combined during failure the recurrence environmental test conditions. failure The combination The equipment of a typical analysis, and through the effectiveness. The and the verification (see MIL-HDBK-189). by the procuring of test item in test facility. which is representative detection, of failures RD/GT tests shall be as specified Installation in a manner monitoring, test (RD/GT), problems Task description. An RD/GT shall be conducted to enhance system reliability analysis and correction of failures, and the verification of corrective action RD/GT test will incorporate test facility provides TEST of environmental test condi tians activity. to be tested field installation, shall be installed and the flow of external in the air around the equipment shall simulate corresponding anticipated operational conditions. All instrumentation required to monitor the test, including the operation of the test facility, shall be provided. Calibration and adjustment of the test items during the test shall be limited to that which is specified in the approved test procedure. 220.127.116.11 Testinq sequence. The testing sequence shall be performed as specified in the test procedure and shall be repeated until a failure occurs. When a failure occurs, investigation and analysis shall be initiated to determine failure cause (see 4.6). 202.2.2 Reliability test records. Reliability in the approved test procedures and shall account test records shall be maintained continuously for all calendar and operating time. as specified 18.104.22.168 Performance Parameter measurements. The equipment performance parameters measured and the frequency of measurement shall be as specified by the procuring activity. When of required performance parameters time of failure cannot be determined, recorded measurement is not within specified limits, a failure shall be recorded. If the exact the failure shall be presumed to have occurred at the time of the last of the same parameter. The results of all measurements during the test cycle. Atleastonesetof measurements after any specified equipment startup period. 22.214.171.124 Failure actions. to be the value When a failure shall be made when i:observed, shall be made and recorded the equipment is first energized entries shall be made on the data Iogsand the failed equipment shall be removed from test with-minimum interruption to the equipment continuing on test. Failure actions shall be specified in the test procedure. The absence of one or more items of equipment from test shall not interfere with the continued entry of log data. failed 126.96.36.199 Replacement parts may be authorized of failed items. Temporary replacement of plug-in items or replacement of by the procuring activity to permit the test to continue while failures are being investigated. Modules and wbassemblies shall not be permanently designated as dispo~able-at-fail ure items. Failure of disposable-at-failure determine failure cause (see 4.6. 1.3). 188.8.131.52 Failure recordinq, analysis, and corrective action. replaced unless previously items shall be investigated All failures occurring during to RD/GT tests shall be recorded, investigated, and analyzed to determine the cause of failure. Corrective actions shall be developed to preclude recurrence of the failure (we 4.6. I ). The effectiveness of each corrective action shall redemonstrated prior to incorporating it in the equipment design. 202-1 I MI L-STD-781 202.2.3 Reliabilitva rowth monitoring. Reliability D growth shall be monitored during RD/GT tests by comparing test results to the reliability growth profile. The achieved reliability, expressed as a point estimate, shall be plotted on the same chart as the predicted growth curve (see FIGURE 103-1). Data from the RD/GT test and other applicable tests shall be used to plot this curve. The achieved reliability curve shall not be adjusted by excluding past failures after the design changes which purport to eliminate these failures have been implemented. 202.2.4 Reliability estimates and projections. shall be prepared for each specified system reliability statistical methods and techniques in MI L-H DBK-189 Details to be specified 202.3 contract shall include the information . . “ ● . . a. Specification b. Identification c. d. e. f, g. bv the procurinq specified parameter activitv in a through estimates and future (see 6.1. Il. proje’aions using the Details to be included in the i, as applicable: of the required value for each reliability of eauioment to be used . . parameter to be measured Specification of the combination of environmental test conditions and levels Specification,o f.performance parameters to be measured and frequency of measurement Imposition of TASK 102 as a prerequisite task Imposition of TASK 103 as a prerequisite task Imposition of MIL-STD-785, TASK 104, Failure Reporting, Analysis, and Corrective Action System (FRACAS), as a requisite task h. Authorization of temporaw failure investigation required Reliability parameter. Projections shall be made and MI L-H DBK-781, Section 4. use of plug-in’ modules i. The following data item descriptions as deliverable data items: (DIDs) apply. to thistask DI-RELI-80252 DI-RELI-80253 DI-RELI-80254 DI-RELI-80255 continued and”shallbe ., Reliability Reliability Test Plan Test Procedures Reliability Test Repo~ Failed Item Analysis Repoti Corrective Action Plan Failure Summary and Analysis Report g Essential 202-2 ,,,: .’. “. . .testing during specified when T~ plQ DI-RELI-802S0 DI-RELI-802S1 to permit : .. . ~. .’ MIL-STD-781 TASK SECTION RELIABILITY D 300 ACCOUNTING 300-1 TESTS MI L-STD-781D TASK ENVIRONMENTAL SECTION 400 STRESS SCREENING 400-1 MI L-STD-781’D ● d. Specification of performance parameters to be measured of measurement ● e. Imposition of TASK 102 as a prerequisite task ● f. Imposition of MIL-STD-785, TASK 104, Failure SYstem (FRACAS), as a prerequisite task, g. h. required Identification of refurbishment The following data item descriptions as deliverable Reporting, during Analysis, the test and the frequency and Corrective requirements (DIDs) apply to this task and shall be specified data items: DI-RELI-80250 DI-RELI-80251 DI-RELI:80252 DI-RELI-80253 DI-RELI-80254 DI-RELI-80255 Action Reliability Reliability Test Plan Test Procedures Reliability Test RepoR Failed Item Analysis Report Corrective Action Plan Failure Summary and Analysis ●Essential 302-3 Report when MI L-STD-781D TASK 302 PRODUCTION RELIABILITY ACCEPTANCE TEST 302.1 Pumose. The purpose of TASK 302 is to determine if the production equipment conform to specified performance and reliability requirements under specified environmental 302.2 Task description. Production selected equipments from each production selected by the procuring acceptance tests specified activity Reliability Acceptance Tests (PRAT) shall be conducted on lot as specified by the procuring activity. PRAT shall be as from the sequential, in MIL-HDBK-7B1, continues to conditions. fixed duration, or all-equipments Section 4 and shall be executed environmental test conditions used in the reliability qualification equipments tested shall statistical y represent the lot from which and the rules for sample selection shall be as specified PRAT shall be subjected to acceptance preconditioning under production the same combined tests. For a sampling-type test, the they are sel ected. Lot size shall be defined by the procuring activity. All equipment selected for and shall pass the tests specified in the production test specification. 302.2.1 Combined environmental test conditions. 4.3) to be applied during reliability production acceptance procuring activity. The combined environmental test conditions (see tests shall be as specified or approved by the 302.2.1.1 Installation of test item in test facility. The equipment to be tested shall be installed in the test facility in a manner which is representative of a typical field installation, and the flow of external air around the equipment shall simulate corresponding anticipated operational conditions. All instrumentation required to monitor the test, including the operation of the test facility, shall be provided. Calibration and adjustment procedure. of the test items during the test shall be limited to that which is specified 302.2.1.2 Te$tinq sequence. The testing sequence shall be performed procedure. This sequence shall be repeated until an acceptor reject decision is completed. 302.2.2 Reliability approved test procedure. test records. Reliability in the approved test as specified in the test is reached or the total test time test records shall be maintained as specified in the 302.2.2.1 Performance parameter measurements. The equipment performance parameters to be measured and the frequency of measurement shall be as specified by the procuring activity. When the value of any required performance parameter is not within specified limits, a failure shall be recorded. If the exact time of failure cannot be determined, the failure shall be presumed to have occurred at the time of the last recorded observation or successful measurement-6f that parameter. Observations and measurements $hall be periodically made and recorded during the test cycle. At least one set of measurements shall be recorded when the equipment is first energized after any specified equipment shutdown period. 302.2.2.2 Failure actions. At the time of failure, entries shall be made on the data logs and the failed equipment shall be removed from test and repaired with minimum interruption to the equipment continuing on test. Failure actions shall be as specified in the test procedure. All failed item$ shall be replaced. Any item-which has deteriorated but does not exceed specified tolerance limits shall not be replaced unless that part is known to have been stressed beyond its rated capability due to the failure of another part. After a failed and repaired equipment has been returned to operable condition, and the effectiveness of the repair verified, the equipment shall be returned to test with minimum interruption to the other equipment on test. The absence of one or more items of equipment undergoing repair shall not interfere with the continued entry of log data. Unless determined to be nonrelevant, failures discovered in equipment or subelements during troubleshooting which are not dependent 302-1 on the basic failure, shall be MI L-STD-781 categorized, recorded and considered as relevant multiple failures occurring at the same time as the basic failure. Failed modules and subassemblies shall not be permanently replaced unless previously designated 1 disposable-at-failure rnaybea. thorized I permit the test to continue. Piece parts removed the equipment could be impaired. I I I I as items or approved by the procuring activity. Temporary replacement of plug-in items by the procuring activity during troubleshooting and repair periods, when necessary, to during repair shall not be reinstalled when the reliability of 302.2.3 Failure classification. Ali failures shall be classified as relevant or nonrelevant. Relevant failures shall be further classified as chargeable or nonchargeable. Classification of failures shall be proposed by the contractor and forwarded to the procuring activity’for approval. Failure categories are specified in 4.7. 302.2.4 Lot acceptance. If an accept decision is reached on a lot sampling basis by conforming requirements of the specified test plan and procedures, all equipment in that production lot shall be accepted. The reliability test units shall be resubmitted refurbishment of test units is required, see 302.2.10. for the performance acceptance to the tests. When 302.2.5 All-equipment test acceptance. During all-equipment production reliability acceptance testing, all equipment that complete the specified test satisfactorily shall be accepted until the reject line of the test is crossed. 302.2.6 Lot reiection. If a reject decision is reached on a lot sampling basis, all equipment in that lot are noncompliant, and further acceptance and shipment of units shall be discontinued.. Corrective action shall be taken as specified (see 302..2,8). ,. 302,2.7 All-equipment test reiection. If all-equipment production reliability acceptance testing results in a reject decision by crossing the reject line of the test plan, further acceptance shall be discontinued, Corrective action shall b.etaken as specified (see 302.2.8). 302.2.8 Corrective action. When a reject decision is reached or.the occurrence of pattern failures is determined, the procuring activity shall be immediately notified and a corrective action plan developed. The corrective action plan shall specify the proposed corrective action and its impact on the program and the reliability rendered of the equipment. Requirements obsolete because of any redesign for the disposition of all defective material and material shall be included to ensure their exclusion from the production equipment. Prior to implementation, the corrective action for its approval in accordance with contract requirements. 302.2.9 Preventive maintenance. Only preventive plan shall be submitted maintenance to the procuring procedures specified activity for the equipment during service use and specified in the approved test procedures shall be performed dwing PRAT. No additional preventive maintenance is permitted during PRAT or during repair unless specifically .. authorized by the procuring activity. 302.2.10 Refurbishment. Unless otherwise specified by the procuring activity, the equipment shall be refurbished and returned to satisfactory operation at the completion of PRAT. Failed parts and parts which have deteriorated b“t have “ot exceeded specified tolerance limits shall be replaced, unless the procuring activity directs otherwise. test procedures prior to shipment. All refurbished equipment 302.3 Details to be specified by the procurinq activity contract shall include the information specified in a through . . . a. b. Specification Specification of test plan to be used of rules for sample selection c. Specification of the comb!ned 302-2 shall successfully complete the acceptance (see 6.1, Il. Details to be specified h, as applicable: and definition environmental I I D of a lot test conditions and levels in the MI L-STD-781.D ● * ● * a. Specification of test plan to be used b. c. d. Identification Specification Specification of equipment to be used of the combined environmental test conditions and levels of performance parameters to be measured during the test and the frequency of measurement ● e. ● f. required Imposition Imposition of TASK 102 as a prerequisite task of MI L-STD-785, TASK 104, as a prerequisite g. Identification of refurbishment h. The following data item descriptions as deliverable requirements task after completion of test (DIDs) apply to this task and shall be specified data items: QIQ D1-RELl~80250 DI-RELI-80251 DI-RELI-80252 DI-RELI-80253 DI-RELI-80254 DI-RELI-80255 Reliability Test Plan Reliability y Test Procedu res Reliability Test Report Failed Item Analysis Report Corrective Action Plan Failure Summary and Analysis ‘Essential 301-3 Report when MI L-STD-781D TASK 301 RELIABILITY 301.1 specified Purpose. performance QUALIFICATION The purpose of TASK 301 is to demonstrate and reliability 301.2 Task description. representative of the approved requirements TEST that the equipment under the specified combined design conforms environmental to conditions. Reliability qualification tests shall be conducted on equipments which are production configuration. Unless otherwise speci fied, two equipments shall be used for reliability qualification testing. Test plans utilized those from MIL-HDBK-781, Section 4, as specified or approved a, fl, and d values shall be and the appropriate by the procuring activity. 301.2.1 .Reliabilitv qualification test requirements. Reliability qualification tests shall be conducted in accordance with reliability test procedures which have been approved by the procuring activity. Testing shall be continued been completed, 301.2.1.1 (see 4.3) applied until an acceptor unless otherwise reject decision directed has been reached by the procuring or the total required test time has activity. Combined environmental test conditions. The combined environmental test conditions during reliability qualification tests shall be as specified or approved by the procuring activity. 301.2.1.2 Installation of test items in test facility. The equipment to be tested shall be installed in the test facility in a manner which is representative of a typical field installation, and the flow of external air around the equipment shall simulate corresponding anticipated operational conditions. All instrumentation required to monitor the test, including the operation of the test facility, shall be provided. Calibration and adjustment procedure. of the test items during the test shall be limited 301,2.2 approved Reliability test records. Reliability to that which is specified test records shall be maintained in the approved as specified test in the test procedure. 301.2.2.1 Performance Parameter measurements. The equipment performance parameters measured and the frequency of measurement shall be as specified by the procuring activity. When to be the value of any required performance parameter is not within specified limits, a failure shall be recorded. If the exact time of failure cannot be determined, the failure shall be presumed to hive occurred at the time of the last recorded observation or successful measurement of that same parameter. Observations and measurements shall be made at the specified interval shall be recorded when the equipment and recorded during the test cycle. At least one set of measurements is first energized after any specified equipment shutdown period. 301.2.2.2 Failure actions. At the time of tilu,re, entries shall be made on the data logs and the failed equipment shall be removed from test and repaired with minimum interruption to the equipment continuing on test. Failure actions shall be as specified in the test procedure. All failed items shall be replaced. Any item which has deteriorated but does not exceed specified tolerance limits shall not be replaced unless that part is known to have been stressed beyond its rated capability another part. After a failed and repaired equipment has been returned to operable due to the failure of condition, and the effectiveness of the repair verified, the equipment shall be returned to test with minimum interruption to the other equipme?t on test. The absence of one or more items of equipment undergoing repair shall not interfere with the continued entry of log data. Unless determined to be nonrelevant, failures discovered in equipment or subelements during troubleshooting which are not dependent categorized, recorded, and considered as relevant multiple failures occurring failure. Failed modules and subassemblies shall not be permanently replaced disposable-at-failure may be authorized on the basic failure, shall be at the same time as the basic unless previously designated as items or approved by the procuring activity. Temporary replacement of plug-in items by the procuring activity during troubleshooting and repair periods, when necessary, to 301-1 I I MI L-STD-781D permit the test to continue. Piece parts removed the equipment could be impaired. during repair shall not be reinstalled when the reliability of 301.2.3 Failure classification. All failures shall be classified as relevant or nonrelevant. Relevant failures shall be further classified as chargeable o! nonchargeable. Classification of failures shall be proposed by the contractor and forwarded to the procuring activity for approval. Failure categories are specified in 4.7. I I 301.2.4 Reliability q ualification comtiiance. by the procuring activity after each equipment failure Compliance shall be based on the total accumulated the time of the review. Reliability qualification compliance shall be reviewed is categorized or at any other appropriate time. test time and the total number of chargeable failures at 301.2.4.1 Compliance determination. Compliance shall be determined by comparing the test results with the accept or reject criteria of the specified test plan. The accumulated test time is the total equipment equipment operating time or exposure time, whichever is appropriate, and shall be recorded asaccumulated test hours. Failures classified as chargeable shall not be reclassified as nonchargeable on the basis of a recommended reliability corrective 301.2.4.2 Accept decision. when an accept decision and the procedure of the reliability any single equipment equipments on test. action. The equipment design shall be qualified for production with is reached by conforming to the requirements of the specified qualification has accumulated test. An accept decision Iess,than one-half of the average respect to test plan shall not be made at a point where creditable test time for all 301.2.4.3 Reie<t decision. If the relia~lity qualification test results in a reject decision, the equipment design has not been qualified for production with respect to reliability. In the event of a reiect .,. decision, a corrective action plan shall be developed in accordance with 301.2,5 which shall address all failures that have occurred during the test. After the corrective actions have been-approved and incorporated in the equipment, a retest shall be conducted using the same or other sample size as approved by the procuring activity. surveys shall be repeated reliability rendered action. activity When a reject decision is reached or the occurrence of pattern failures shall be immediately notified and a corrective action plan developed. action plan shall specify the proposed of the equipment. Requirements obsolete because of any redesign ., ,. . . .. .> corrective action and its impact. on.the is program. and the. for the disposition of all defective material and material shall be included to ensuret heir exclusion from the production equipment. Prior to implementation, the corrective action for its approval in accordance with contract requirements. plan shall be submitted to the procuring activity =. 301.2.6 Preventive maintenance. Only the preventive” maintenance procedures specified for the equipment during service use and listed in the approved test procedures shall be performed during the reliability qualification test. No additional preventive maintenance shall be permitted during the reliability qualification , . . Unless otherwise specified by the procuring activity, the thermal and vibration if those aspects of the design are affected by the corrective action. 301.2.5 Corrective determined, the procuring The corrective ..,, test or during repair unless specifically authorized by the procuring activity. 301.2.7 Refurbishment. Unless otherwise specified by the procuring activity, the equipment shall be refurbished and returned to satisfactory operation at the completion of the reliability qualification test. Failed items shall be replaced>nd items which have deteriorated but do not exceed specified tolerance limits shall be replaced, unless the procuring activity directs otherwise. All refurbished successfully complete the acceptance test procedures prior to shipment. 301.3 Details to be specified bv the procurinq activitv contract shall include the information specified in a through 301-2 equipment shall (see 6.1. 1). Details to be included h, as applicable: in the .. : . . MI L-STD-781D 0.04g2/Hz + 3 d8 /OCTAVE -3 d8 IOCTAVE ./ \ .-. 20 2000 350 80 FREQUENCY-Hz FIGURE 401-1. Random 401-3 vibration spectrum. *,9 MI L-STD-781D TASK 401 ENVIRONMENTAL 401.1 Purvose. environmental defective reliability procuring The purpose stress screening STRESS SCREENING of TASK 401 is to require (ESS) to detect and correct the formulation latent and implementation manufacturing defects (marginal of and parts, workmanship p defects, and other nonconforming anamolies) before the initiation of accounting tests. (ESS also may be applied to each production item before acceptance by the activity.) 401.2 Task description. ESS shall be conducted at selected levels of assembly. During full-scale development, ESS procedures shall be developed for the system and for all lower levels of equipment which may be procured separately as spare or repair parts: The application and implementation of these procedures during full-scale development and production shall be included in the overall reliability test planning. 401.2.1 ESS desiqn. ESS shall be deigned to stimulate failures due to latent manufacturing defects. The applied environmental stresses need not simulate the item’s specified life-cycle, mission and environmental profile. Ouring ESS. the item shall be cycled through operational modes while simultaneously being subjected MIL-HDBK-781. to the required environmental stresses. A discussion of ESS techniques is specified in 401.2.2 Environmental stresses. Unless otherwise specified by the procuring activity, the environmental stresses applied during ESS shall be random vibration and temperature cycling. The random vibration power spectral density curve and the thermal profile definition for temperature cycling shall be as specified by the procuring activity. These environmental stresses maybe applied either in combination or in sequence. “Unless otherwise specified by the procuring activity, the random vibration spectrum specified in FIGURE 401-1 shall be utilized. 401.2.2, the equipment number I Equipment installation. shall be hard-mounted Unless otherwise on the vibration specified platform or approved by the procuring 401.2.2.2 Random vibration. Random vibration shall be applied fora minimum of axes along which vibration shall be applied shall be based on the packaging equipment. of 5 minutes When vibration on each axis. on more than one axis is required, activity, or fixture. the vibration of 10 minutes. design of the shall be applied The for a minimum 401.2.2.3 Temperature cyclinq. Temperature cycling shall be performed continuously in accordance with the specified thermal profile and for the specified number of cycles. Unless otherwise specified by the procuring activity, the rate of temperature change may be the maximum attainable by the chamber but in no case shall it cause the equipment to experience a rite of change less than 5-C per minute the equipment to experience thermal shock. More detail is provided in MI L-H DBK-781. 401.2.2.4 ESS sequence. sequence shall be continuously failure free cycles is completed. until the specified failure nor shall it cause The ESS sequence shall be performed as specified in the ESS procedure. This repeated until a failure occurs or the specified failure free time or number of When a failure occurs, the equipment shall be repaired and ESS resumed free time or cycles are completed. 401.2.3 ESSapplicability. ESS$hall be applied to all equipments submitted for reliability testing. Failures occurring during ESS are not chargeable for acceptor reject decisions but shall be recorded and analyzed, and appropriate repair action shall be taken. Repair shall be limited to that which is necessary to restore the equipment to its prefai lure condition, in accordance with contract requirements. Unless 401-1 MI L-STD-781D otherwise operating specified in the ESS procedures, the last repair during the ESS shall be ve~fied period of at least two consecutive temperature cycles. 401.3 Details to be specified bv the procurinq activitv (see 6.1. Il. contract include the information specified in a th,rough k, as applicable: a. Reliability * ● ● Imposition of TASK 10J, Test Procedure b. Environmental Integrated Test Plan Document, stress types h. Vibration axes requirements The following as deliverable in the and TASK 102, Specification of random vibration power spectral density curve Specification of thermal profile for temperature cycling Specification of number of hours (cycles) for the ESS Specification of number of consecutive failure-free operating hours (cycles) Equipment mounting requirements for vibration k. L Details to be specified c. d. e. f. g. i. Performance measurement ● j. Imposition of MI L-STD-78S, System (FRACAS), as a prerequisite task required Reliability by a failure-free and minimum vibration time per axis requirements before, during, and after ESS TASK 1.04, Failure Reporting, Analysis, and Corrective data item descriptions Action [DIDs) apply to this task and shall be specified data items: DI-RELI.80249 DI-RELI-80250 DI-RELI-80251 DI-RELI-80253 DI-RELI-80255 Environmental Stress Screeqi.ng Reliability Test Plan Repo~. ., Reliability Test Procedures Failed Item Analysis Report Failure Summary *Essential 401-2 and Analysis Report when ,“ INSTRUCTIONS: In . mmtiuiw ●ffort to makeour stmdamli=ationdomme.ti better, the DoD vroridu this form ror w in n- are imited 10 p,onde cubmittiru mmmr.mta -d uwwatiom [., imPM.mentA. AU w“ of milix stmdmdization d— sussuttom ‘l%b form my be detached, folded ak.ns the lina indicated, taped along M Iooae edge (DO NOT ET,4PLE), and Problem amsa mch u w+ins whkb [email protected]=d interpretation, = mailed. In Mock 6. be u mecifie u pcuible about Puticulm too ridd. restrictive. pvblecm. EIIW? Anowledsemmi lm. in ambimwus. block 6 anY mmrh or m not irwmmtible, relakd to will be msiled @ You within 30 bya and sim to let PIWWSOCI puagnpb ● Wecifii You know that wmUIU chmwa of the d— your .1. which U cmnmenb block we. would allewiala tha 7 u rolled out, an recekd and are ktnz umddczed. NOY73: ‘l%ta form ~to tin mY mot b+ wed an —t m~~ Uly POrum Or the .feralmd h mquut cor.t.cb. of d.xwnents, nor w reqaest miiwn, deiiatic.m% or clarification of COmmmts submittad on thb form do not miutttmti o? imply a.tbc.rizatioo copies domlnmt(.) or 10 amend (Fold (Fold OEFENSE LoGIsrIcs dam don, COntncmd ** thil nquilemcnfs. UN) MM, AGENCY 111111 p’!ijq uNITED 0; FICIAL WSINE$S ?ENAL?VFOR P~, VATE “SE S300 BUSINESS REPLY MAIL F2F!ST FOS7AGE CLASS PERMIT NO. 4966 WAS”, NGTON 0 C. WILL BE PAluBY THE OEFCNSELoGISTICSAGENCY STATES I I STANDARDIZATION DOCUMENT IMPROVEMENT PROPOSAL (See kfrucfkvu- Rfwie Si&) I ~CUMENT I I N.JM9ER ‘fL-,TTD NAME Z WCUMEN? TITLE - 781~ OP S“BMITTIN.3 ORGANIZATION 4. TVPS ❑ I I 1 I N*. 8Wa. ZIP LEM P“[email protected] o-) use. MANUFACTURER ❑ . okra Cti, •1 PBOn 0nGANlu710N VENDOR ❑ [email protected] I I OF Oml,.,stifi,: - AREA9 N.* d Wonullw .,1.-1. lot n,mmnu.ddom I I I 1 . R-/R ;. I I I FiEMAFlK8 I I I .-. I I I I . NAME 0, SUBMITTER I I lb t nnt, M,, - b. WORO.TELEPHoNENIJU8ER ,I,Icl”& Acd] - O.,lml O.,lon.l MAILING ~ODRESS(Sm,i, CIIY,SW#. Z,FCn&) - ~tlomti ,1 00 ~“gp~ 1426 ,~SV,0U9 EO,T,OM ,9 [email protected] a. O&TE OF SUaMISSlOM,VYUUDD,