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

MI I,-ST1)-1629A3. Content. The FMECA plan shall describe the contractor’sprocedures for implementing the specified requirements of this standardupdating the F~CA to reflect design changes, and use of the analysisresults to provide design guidance. Sample worksheet formats, groundrules, analysis assumptions, identification of the lowest indenturelevel of analysis, coding system description, failure definitions, andidentification of coincident use of the FMECA by the contractor’s reliabilityorganization and other organization elements shall be included in theplan.‘1,3.1 Worksheet formats. The contractor’s formats, whichorganize and document the FMECA and other analysis methods containedherein, shall include the information shown in the example formats,lnFigures 101.3, 102.1, 103.1, 104.1. The initial indenture level ofanalysis shall be identified (item name) on each worksheet, and eachsuccessive indenture level shall be documented on a separate worksheetor group of worksheets. A sample of the contractor’s worksheet formatsshall be included with the FMECA plan.3.2 Ground rules and assumptions. The contractor shalldevelop ground rules and analysis assumptions and include them in theFMECA plan. The ground rules shall identify the FMECA approach (e.g.,hardware, functional, or combination) , the lo~’rst indenture level to beanalyzed, and include general statements of v’hat constitutes a failureof the item in terms of performance criteria and allowable limits.Every effort should be made to ide~~tify ~[~d rec~rd al] ground rules andanalysis assumptions prior to initiation of the analysis; however,ground rules and analysis assumptions may be added for any item ifrequirements change. Additional ground rules and analysis assumptionsshall be documented and separately identified for inclusion in the FMECAreport.3.3 Indenture level. The indenture level applies to thesystem hardware or functional level at which failures are postulated.Unless otherwise specified, the contractor shall establish the lowestindenture level of analysis using the foll~)wing guidelines:a. The lowest level specified in the LSA candidate listto assure complete inputs for each 1.SA candidate.b. The lowest indenture level at which items are assigneda catastrophic (Category I) or critical (CategoryII) severity classifica&ion category (see 4.4.3).c. The specified or intended maintenance and repairlevel for items assigned a marginal (Category III)or minor (Category lV) sevet-ity classificationcategory (See 4.4.3).TASK 10524 November 1980