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

!’11 L-!;’J’l)- 1629A3. 1.17.1 Initial indentyre level. The level of the total, overallItem which Is the subject of &he FMECA.3.1. 17.2 Other indenture lqvels. The succeeding indenture levels(second, third, fourth, etc~) which represent an orderly progression tothe simpler division of the item.3.1.18 Interfaces. The systems, external to the system beinganalyzed, which provide a common boundary or service and are necessaryfor the system to perform its mission in an undegraded mode; for example,systems that SUpply power, cooling, heating, air services, or inputsignals.3.1.19 Single failure point. The failure of an item which WCUIICIresult in failure of the system and is not compensated for by redundancyor alternative operational procedure.3.1.20 Threat mechanism. The means or methods which are embodiedor employed as an element of a man-made hostile environment to producedamage effects on a weapon system and its components.3.1.21 Undetectable failure. A pos~ulated failure mode in theFMEA f@r which there is l}{)fai;ur+ det~rti(~llwet}~cd by ~’l~irl~ t}~t+optw+’l~ris made aware of the failure.4. GENERAL REQUIREMENTS4.1 General. The failure mode, effects, and criticalityanalysis (FMECA) shall be planned and performed in accordance with thegeneral requirements of this standard and the task(s) specified by theprocuring activity.4.2 Implementation. Tl~e FMECA shall be initiated early inthe design phase to aid in the evaluation of the design and to provide abasis for establishing corrective action priorities. The FMECA is ananalysis procedure wl]iclldocuments all probable failures in a systemwithin specified ground rules, determines by failure mode analysis theeffect of each failure on system operation, identifies single failurePoints, and ranks each failure according LO a severity classifica~ion offailure effect. Tilis procedure is t}:e resu~L c’f twf! steps wi~ich, whencombined, provide the FMECA. These two steps arc:a. Failure mode and effects analysis (FMEA).b. Criticality analysis (CA).4.3 FMECA planning. Planninf\ the FNECA work involves Lhecontractor’s procedures for implementing the specified requirements ofthis standard, updating the FM’ECA LO reflect design changes, and ~Ise of