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

MTT,-sTn-1629Afor each mission, mission phase, and operationalmod e. Narratives should describe the environmentalprofiles, expected mission times and equipmentutilization, and the functions and outputs of eachitem.b.c.d.e.f.g“h.Construct block diagrams. Functional and reliabilityblock diagrams which illustrate the operation,interrelationships, and interdependencies of functionalentities should be obtained or constructed for eachitem configuration involved in the system’s use.All system interfaces shall be indicated.Identify all potential item and interface failuremodes and define their effect on the immediatefunction or item, on the system, and on the missionto be performed.Evaluate each failure mode in terms of the worstPotential consequences which may result and assigna severity classification category (see 4.4.3)0Identify failure detection methods and compensatingprovisions for each failure mode.Identify corrective design or other actions requiredto eliminate L1-]ef~ilure or concrol the risk.Identify effects of corrective actions or othersystem attributes, such as requirements for logisticssupport.Document the analysis and summarize the problemswhich could not be corrected by desigt~ al)d identifythe special controls which are necessary to reducefailure risk.4.4.3 Severity classification. Severity classifications areassigned to provide a qualitative measure 0[ the worst potential consequencesresulting from design error or item failure. A severityclassification shall be assigned to each identified failure mode andeach item analyzed in accordance with t}]e 1{)ssst.~temcllt.sbelow. Nllcreit ray not be possiblu to idull~ifv da iLeIil(Jr .I f,]ilt.lr~’ mode accordil~gto the loss statements in Ll~c four categories below, similar 10SS statementsbased upon loss of system inputs or outputs shall be developed andincluded in the FMECA ground rules for procurirlg activity approval.Severity classificati~)rlcategories ‘~”hichare c:’ns istent witt] PIIL--STD-882severity caLegorics are cjefined as f~)ll(~ws:9