Designation:D6986−03(Reapproved2020)AnAmericanNationalStandardStandardTestMethodforFreeWater,ParticulateandOtherContaminationinAviationFuels(VisualInspectionProcedures)1ThisstandardisissuedunderthefixeddesignationD6986;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONFuelqualityisparamountinaviationfuelsbecauseoftheircriticalapplication.Manysuccessivetypesofinspectionsareconductedtoensurequalityprotection.Rapid,visualinspectionscarriedoutatvariouslocationsinthefuelsupplysystemareacriticalpartoftheinspectionprogram.Experiencehasshownthatsubjectiveevaluationssuchasdescribedbythistestmethodformaneffectivefieldalertsystemthatisbackedbyother,morequantitativetests.ThepresenttestmethodduplicatesmuchofTestMethodD4176,atestmethodapplicabletoalldistillatefuels.However,thepresenttestmethodalsoincludesfieldmethodsapplicableespeciallytoaviationfuels,andisthereforepublishedasaseparatetestmethod.1.Scope1.1Thistestmethodcoverstwoproceduresforestablishingthepresenceofsuspendedfreewater,solidparticulate,andothercontaminantsinaviationgasolineandaviationturbinefuels.1.1.1Bothproceduresareintendedprimarilyforuseasfieldtestswiththefuelathandlingtemperature.1.1.2ProcedureAusestransparentsamplecontainers;Pro-cedureBusesopaquecontainers.1.2Bothproceduresarerapidmethodsforcontaminationdetectionandincluderatingsofhazeappearanceandparticu-latepresence.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D...
