MIL-STD-1629-RevA - Barringer and Associates, Inc.

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?IIL-STD-1629AiiiIAu)u)t-IVauvuokJ&wzo1=uzi>wzId—IAuK101-11TASK 10124 Nov(’mh(’r1980
MIL-STD- 1629ATASK 102CRITICALITYANALYSIS1. Purpose. The purpose of the criticality analysis (CA) isto rank each potential failure mode identified in the FMEA Task 101,according to the combined influence of severity classification and itsprobability of occurrence based upon the best available data.1.1 Application. The CA, Task 102, supplements the FMEA,Task .101, and shall not be imposed without the imposition of Task 101.2. Documents referenced in Task 102:llANDBOOKSMilitarvMIL-HDBK-217 Reliability Prediction of Electronic Equipment3. Analysis approach. One approach from the two specifiedin 3.1 and 3.2 of Task 102 shall be selected. The availability ofspecific parts configuration data and failure rate data will determinethe analysis approach to be used. The qualitative approach is appropriatewhen specific failure rate data arc not available. The failure probabilitylevels, when used, should be modified as L})esystem is better defined.As parts configuration data and failure race data become available,criticality numbers should be calculated and incorporated in the analysis.3.1 Qualitative approach. Failure modes identified in theFMEA are assessed in terms of probabili~y of occurrence when specificparts configuration or failure rate data are not available. Individualfailure mode probabilities of occurrence should be grouped into distinct,logically defined levels, h’hich establish cllequali~ative failure probabilitylevel for entry into the appropriate CA worksheet column. ProbabilityOf Occurrence Ieve]s are defined as follows:a. Level A - Frequent. A higl]probability of occurrenceduring the item operating time interval. Highprobability may be defined as a single failure modeprobability greater than 0.20 of tl]eoverall probabilityot failure during the item operating time interval.b. Level B - Reasonably probable. A moderate probabilityof occurrence during the item operating time interval .Probable may be defined as a single failure modep~(lhability Of (j~~(jrr~~]]~~ w!li~j~is m~re Ll)an (J.1ObuL less than 0.20 of the overall probability offailure during the item operating time. .-. -——-— —....= — — —=-.—.-—.=-_>_—_-—_—_—— —.
Page 1 and 2: MIL-STD-1629A24 NOVEMBER 1980SUPERS
Page 3 and 4: MT7,-STW 1629AFOREWORDIThe~failure
Page 5 and 6: ----MIL-STD-16Z9ACONTENTS(Continued
Page 7 and 8: MI1.-STD-1629A1. SCOPEThis standard
Page 9 and 10: MTL-STD-1 629A3. DEFINITIONS3.1 Ter
Page 11 and 12: !’11 L-!;’J’l)- 1629A3. 1.17.
Page 13 and 14: .MT1.-ST~-l629A4.3.5 Failure defini
Page 15 and 16: MTT,-sTn-1629Afor each mission, mis
Page 17 and 18: ?f?l.-STD-l629Ab. Des~ripGlon of de
Page 19 and 20: MT1,-STD-1629A3.2 Functional approa
Page 21 and 22: MI J,-STD-16?9Afunctional block dia
Page 23 and 24: MI L-STD-1629A5.6.2 Next higher lev
Page 25 and 26: Ml 1,-STD-1079Afurther amplified in
Page 27: MIL-STD-1629A. --1III[IIIIIIIIIIIii
Page 31 and 32: IMII.-ST1)-162(]Ashown in Figure 10
Page 33 and 34: MIL-STD-1629Awhere:C* = Criticality
Page 35 and 36: MI I.-sTI)-I629AINCREASINGCRITICALI
Page 37 and 38: MIL-STD-1629A3*1 Failure predictabi
Page 39 and 40: .--— .-—--— , --—— ——
Page 41 and 42: MTL-STD- 1629A4\l Damage modes. All
Page 43 and 44: NI 1.-[; 1’1)- 1(); ?!)Au0.-.mr-r
Page 45 and 46: MI I,-ST1)-1629A3. Content. The FME
Page 47 and 48: —..-A 1MIL-STD-1629AAPPENDIXA10.
Page 49 and 50: MIL-STD-1629A50.1.3 Intended use. T
Page 51 and 52: MIL-STD-1629AWhere:C= “ Criticali
Page 53 and 54: INSIRUCII ONS: In ● continuing ef
Page 55 and 56: MIL3TD-1629ANotice 17 June 1983MILI
Page 57 and 58: MIL-STD-1629ACONTENTS (Continued)Fi
Page 59 and 60: MIL-STD-1629ASPECIFICATIONSMilitary
Page 61 and 62: MIL-STD-1629Ad. Functional Failure
Page 63 and 64: MIL-STD-1629A..2’Ilm.o.,id1-< xQ
Page 65 and 66: —MIL-STD-1629A50.5 DMEA (Task 104
Page 67 and 68: MIL-STD-1629ACONTENTS (Continued)Pa
Page 69 and 70: .-MIL-STD-1629AAPPENDIX AAPPLICATIO
Page 71 and 72: 20-30Stop LCNMIL-STD-1629AEnter the
Page 73: NOTICE OFCANCELLATIONNOT MEASUREMEN

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