MAINTAINABILITY DESIGN TECHNIQUES METRIC - AcqNotes.com

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Downloaded from http://www.everyspec.com on 2011-10-29T14:56:01.DOD-HDBK-791(AM)parts in assigned commodity classes and collects data onnonstandard parts for developing or updating militaryspecifications and standards.3-6.4 MIL-STD-143, STANDARDS ANDSPECIFICATIONS, ORDER OFPRECEDENCE FOR THE SELECTIONOFMIL-STD-143 (Ref. 14) establishes the order of precedencefor the selection of standards and specifications toidentify and describe items, materials. and processes usedby design activities in the design and production of materiel.The standard indicates that design and applicationconsiderations- i.e., function, environment. reliability,maintainability, strength, safety, and interchangeabilityas well as economic factors shall govern the selection anduse of materials.3-6.5 DEPARTMENT OF DEFENSE INDEXOF SPECIFICATIONS ANDSTANDARDS (DODISS)The DODISS (Ref. 15) is an indispensable publicationin the pursuit of implementing a standardization program.The DODISS is issued bimonthly—in hard copyand in microfiche by alphabetical and numerical listing.The publication lists the unclassified Federal, Military.and Departmental specifications, standards. and relatedstandardization documents and those Industry documentsthat have been coordinated for DoD use, i.e.,1. Military Specifications2. Military Standards3. Federal Specifications and Commercial ItemDescriptions105)4.5.6.7.8.9.10.Il.12.13.14.The1.Federal StandardsFederal Information Processing StandardsQualified Products ListIndustry DocumentsInternational Standardization DocumentsMilitary HandbooksAir Force-Navy Aeronautical StandardsAir Force-Navy Aeronautical Design StandardsOther Departmental DocumentsMilitary/Air Force-Navy AERO BulletinsAir Force Specification Bulletins.DODISS can be obtained as follows:For Military Activities:Commanding OfficerNaval Publications and Forms Center (NPFC5801 Tabor AvenuePhiladelphia, PA 19120-50992. For Government Civil Agencies and Non-GovernmentActivities (subscription basis only):Superintendent of DocumentsUS Government Printing OfficeWashington, DC 20402.3-6.6 QUALIFIED PRODUCTS LIST (QPL)The Qualified Products List (QPL) is a list of productsthat have met the qualification requirements stated in theapplicable specification. including appropriate productidentification and test or qualification reference with thename and plant address of the manufacturer and distributor,as applicable )Ref. 16). To establish a QPL, anapproved and dated military or Federal specificatitionmust exist that sets forth the qualificatition examination,tests, and criteria for retention. Ref. 15 contains a list ofQPLs and standards.QPLs are identified by the symbol “QPL” followed bythe number of the associated specification and an issuenumber to identify the issue of the QPL, e.g., “QPL-8952-1" identifies the initial issue of the QPL associated withmilitary specification MIL-B-8952. Bearing, Roller, RodEnd, Antifriction Self-Aligning. For Federal specifications,both the specification symbol and number are used,e.g., “QPL-ZZ-T-381-2” identifies the second issue of thelist associated with Federal specification ZZ-T-381. Tire,Pneumatic, Vehicular (Highway). Specification revisionindicators tire not used in the QPL number.3-6.7 ARMY MASTER DATA FILE (AMDF)The AMDF (Ref. 17) is another indispensaible publication(microfiche) since it is the official source of currentsupply management data for the items maneged or usedby the Department of the Army (DA). Items are listed byNational Stock Number (NSN); the interpretation of thecodes associated with the listing is found in Ref. 18. Thedata have precedence over conflicting data published inany other DA publication except for items within thepurview of SB 700-20, Army Adopted/Other ItemsSelected for Authorized/List of Reportable Items.Copies of AMDF can be obtained fromCommanderUSAMC Catalog Data ActivityATTN: AMCA-PPNew Cumberland Army DepotNew Cumberland, PA 17070-5010.3-6.8 IDENTIFICATION LIST (IL)The IL is arranged by Federal Supply Class (FSC)groupings (see Ref. 19 for groups and classes) and containsdescriptions of all active items in the Defense LogisticsServices Center (DLSC). Data elements reflect relatedcharacteristics and or reference number. The principaluses of the IL are to obtain or verify a National StockNumber (NSN) when only the characteristics of an itemare known, to assist in determining interchangeable andsubstitute items, and to obtain data when the NSN isknown.The ILs contain proprietary information and are forGovernment use only. Army installations may obtain3-8
Downloaded from http://www.everyspec.com on 2011-10-29T14:56:01.DOD-HDBK-791(AM)microfiche copies of the ILs by mailing a completed DAForm 12-21 toCommanderUS Army AG PublicationsATTN: AGDL-ODR1655 Woodson RoadSt. Louis, MO 63114.3-6.9 NATIONAL STOCK NUMBER (NSN)During World War II the military services' supply systemswere fraught with problems. For example, each ofthe services operated several different supply systems.Within the Army alone there were eight Technical Services,each operating an independent supply system withdifferent stock numbering methods, different specificationguides for identical items. different supply catalogformats. and different descriptive languages. It is obviousthat the system resulted in waste, inefficiency, and lack ofstandardization.Te Defense Cataloging and Standardization Act,enacted in 1952, resulted in a Government-wide systemjointly administered by he DoD and the General ServicesAdministration (GSA). The Act required “the use ofcommon supply language for naming, identifying, anddescribing each item repetitively used, purchased, orstocked for distribution by the DoD". The Act alsorequired the development of a unique stock numberingsystem to identify each item, part, assembly, or componentso it could be distinguished from another. The resultingsystem, called the Federal catalog system, is a complexstructure that provides services to users world-widemilitaryservices, other DoD components, NATO, friendlyforeign governments. and private sector contractorsdoing business with the US Government. Thus the Federalcatalog system supports logistic functions such asmaintainability concepts, repair part management, andprocurement.The net result of the Act was the evolution of a nationalstock number (NSN) that identifies an item throughoutits entire life cycle in the Federal catalog system. The NSNis the means of access to the various part lists previouslydescribed. The NSN structure consists of 13 digits (seeFig. 3-3). The first four digits comprise the Federal supplyclassification (FSC) code as listed in Ref. 19; the last ninedigits are the national item identification number (NIIN).The NIIN is subdivided into a 2-digit National CodificationBureau Code (NCBC) and a 7-digit item identificationnumber sequentially assigned by the Defense LogisticsService Center (DLSC). Presently, there are 24country codes stored in the DLSC data bank (Ref. 6).AR 708-1 (Ref. 20) directs that items in the Armysupply system will not be ordered by commercial partnumbers, i.e., the numbers that commercial firms use toidentify items of their manufacture. The DLSC has beendirected to assign an NSN to every standard item in theArmy supply system. To ensure that items do not enterthe Army supply system without an NSN, the ArmyMateriel Command (AMC) had the DLSC assign NSNSautomatically to all items authorized for central stock ageat the wholesale level. NSNS are also to be listed in partmanuals, and part number-to-NSN cross-reference chartsare to be issued with commercial manuals before releasingnew equipment to the field (Ref. 21).For improved standardization and parts reduction, it isobvious that the maintainability engineer must be awareof the NSN and the information that it conveys.3-6.10 TEST, MEASUREMENT, ANDDIAGNOSTIC EQUIPMENT (TMDE)3-6.10.1 GeneralThe necessary maintenance operations and characteristicsof equipment determine TMDE requirements. Toneglect considering TMDE requirements until equipmentdesign and maintenance procedures are finalized mayresult in the demand for many special tools or an unnecessarilywide variety of standard tools and test equipment.Designers have a tendency to design equipment withproprietary TM DE. Further. they tend to assume that theTMDE in their design facilities will be available at thepoint of use. In fact, such devices, when provided, performpoorly in the hands of lower level technicians andFigure 3-3. NSN Configuration3-9
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