Designation:E2100−04(Reapproved2015)StandardPracticeforCalculatingtheInternationalRunwayFrictionIndex1ThisstandardisissuedunderthefixeddesignationE2100;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThispracticecoversthecalculationoftheInternationalRunwayFrictionIndex,IRFI,frommeasurementsobtainedbylocalfriction-measurementdevices2onmovementareasunderwinterconditions.1.2TheIRFIistheinternationalfrictionindextobeusedforreportingthefrictioncharacteristicsofairportmovementareas.1.3TheIRFIreportedbythispracticeisaharmonizedvalueofthepavementfrictioncharacteristics.1.4TheIRFIobtainedbyusingthispracticehasnotbeenextendedtoaddressthebrakingperformanceofanaircraft.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareprovidedforinformationonly.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3E524SpecificationforSmoothTireforPavementSkid-ResistanceTestsE867TerminologyRelatingtoVehicle-PavementSystemsE1551SpecificationforSpecialPurpose,Smooth–TreadTire,OperatedonFixedBrakingSlipContinuousFrictionMeasuringEquipmentE1844SpecificationforASize10×4–5Smooth-TreadFrictionTestTireE1859TestMethodforFrictionCoefficientMeasurementsBetweenTireandPavementUsingaVariableSlipTech-niqueE1960PracticeforCalculatingInternationalFrictionIndexofaPavementSurface3.Terminology3.1Definitions:3.1.1basesurface,n—thetypeofsurfaceevaluated;therearefourclasses(1)barepavementdry,(2)barepavementwet,(3)barecompactedsnowand(4)bareice.3.1.2compactedsnow,n—acompressedsolidmassofsnow,whichissufficientlystrongtopreventanormallyloa...
