Designation:E2555−07(Reapproved2012)AnAmericanNationalStandardStandardPracticeforFactorsandProceduresforApplyingtheMIL-STD-105PlansinLifeandReliabilityInspection1ThisstandardisissuedunderthefixeddesignationE2555;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThispracticepresentsaprocedureandrelatedtablesoffactorsforadaptingPracticeE2234(equivalenttoMIL-STD-105)samplingplanstoacceptancesamplinginspectionwhentheitemqualityofinterestislifelengthorreliability.Factorsareprovidedforthreealternativecriteriaforlotevaluation:meanlife,hazardrate,andreliablelife.Inspectionofthesampleisbyattributeswithtestingtruncatedattheendofsomeprearrangedperiodoftime.TheWeibulldistribution,togetherwiththeexponentialdistributionasaspecialcase,isusedastheunderlyingstatisticalmodel.1.2Asystemofunitsisnotspecifiedbythispractice.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E456TerminologyRelatingtoQualityandStatisticsE2234PracticeforSamplingaStreamofProductbyAttri-butesIndexedbyAQL2.2OtherDocuments:MIL-STD-105ESamplingProceduresandTablesforIn-spectionbyAttributes33.Terminology3.1Definitions:3.1.1TheterminologydefinedinTerminologyE456appliestothispracticeunlessmodifiedherein.3.1.2acceptancequalitylevel(AQL),n—qualitylimitthatistheworsttolerableprocessaveragewhenacontinuingseriesoflotsissubmittedforacceptancesampling.E22343.1.2.1Discussion—Thistermisoftenreferredtoasthe“acceptancequalitylimit.”3.1.2.2Discussion—ThisdefinitionsupersedesthatgiveninMIL-STD-105E.3.1.2.3Discussion—AsamplingplanandanAQLarecho-seninaccordancewiththeriskassumed.Use...
