DEPARTMENTOFTRANSPORTATIONFederalAviationAdministration14CFRPart39[4910-13-P][DocketNo.FAA-2015-2983;DirectorateIdentifier2015-NE-20-AD;Amendment39-18383;AD2016-02-04]RIN2120-AA64AirworthinessDirectives;CFMInternationalS.A.TurbofanEnginesAGENCY:FederalAviationAdministration(FAA),DOT.ACTION:Finalrule.SUMMARY:Weareadoptinganewairworthinessdirective(AD)forcertainCFMInternationalS.A.(CFM)CFM56-5Bseriesturbofanengines.ThisADwaspromptedbyacorrectedlifinganalysisbytheenginemanufacturerthatshowstheneedtoidentifyaninitialandrepetitiveinspectionthresholdforcertainpartnumber(PIN)turbinerearframes(TRFs).ThisADrequiresinitialandrepetitiveinspectionsofcertainPINTRFsonthelow-pressureturbine(LPT)frameassembly.WeareissuingthisADtopreventfailureoftheTRFontheLPTframeassembly,whichcouldleadtoengineseparation,damagetotheengine,anddamagetotheairplane.DATES:ThisADiseffective[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].TheDirectoroftheFederalRegisterapprovedtheincorporationbyreferenceofcertainpublicationslistedinthisADasof[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].ADDRESSES:ForserviceinformationidentifiedinthisAD,contactCFMInternationalInc.,AviationOperationsCenter,INeumannWay,MIDRoom285,Cincinnati,OH45125;phone:877-432-3272;fax:877-432-3329;email:aviation.fleetsupport@ge.com.YoumayviewthisserviceinformationattheFAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA.Forinfom1ationontheavailabilityofthismaterialattheFAA,call78l-238-7125.ltisalsoavailableontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-2983.ExaminingtheADDocketYoumayexaminetheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-2983;orinpersonattheDocketManagementFacilitybetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.TheADdocketcontainsthisAD,theregulatoryevaluation,anycommentsreceived,andotherinformation.TheaddressfortheDocketOffice(phone:800-647-5527)isDocumentManagementFacility,U.S.DepartmentofTransportation,DocketOperations,M-30,WestBuildingGroundFloor,RoomWl2-140,1200NewJerseyAvenueSE.,Washington,DC20590.FORFURTHERINFORMATIONCONTACT:KyleGustafson,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA01803;phone:781-238-7183;fax:781-238-7199;email:kyle.gustafson@faa.gov.SUPPLEMENTARYINFORMATION:DiscussionWeissuedanoticeofproposedrulemaking(NPRM)toamend14CFRpart39byaddinganADthatwouldapplytocertainCFMCFM56-5Bseriesturbofanengines.TheNPRMpublishedintheFederalRegisteronOctober2,2015(80FR59672).TheNPRMwaspromptedbyacorrectedlifinganalysisbytheenginemanufacturerthatshowstheneedtoidentifyaninitialand repetitiveinspectionthresholdforcertainPINTRFs.TheNPRMproposedtorequireinitialandrepetitiveinspectionsofcertainPINTRFsontheLPTframeassembly.WeareissuingthisADtocorrecttheunsafeconditionontheseproducts.2CommentsWegavethepublictheopportunitytoparticipateindevelopingthisAD.WereceivednocommentsontheNPRM(80FR59672,October2,2015)oronthedeterminationofthecosttothepublic.ClarificationtotheRepetitiveInspectionRequirementsWehaverevisedtheCompliance,paragraph(e)ofthisAD,toclarifytherepetitiveinspectionrequirementsforwhentheinitialinspectionisdonepriortotheinitialinspectionthreshold.ConclusionWereviewedtherelevantdataanddeterminedthatairsafetyandthepublicinterestrequireadoptingthisADasproposedexceptforthechangesdescribedabove.Wehavedetermined thatthechangesdescribedaboveareminorchanges,asthey:•AreconsistentwiththeintentthatwasproposedintheNPRM(80FR59672,October2,2015)forcorrectingtheunsafecondition;and•DonotaddanyadditionalburdenuponthepublicthanwasalreadyproposedintheNPRM(80FR59672,October2,2015).WealsodeterminedthatthesechangeswillnotincreasetheeconomicburdenonanyoperatororincreasethescopeofthisAD.RelatedServiceInformationunder1CFRpart51WereviewedCFMServiceBulletin(SB)No.CFM56-5BS/B72-0850,datedDecember19,2012,whichdescribesproceduresforinspectingtheTRF.ThisserviceinformationisreasonablyavailablebecausetheinterestedpartieshaveaccesstoitthroughtheirnonnalcourseofbusinessorbythemeansidentifiedintheADDRESSESsectionofthisfinalrule.3OtherRelatedServiceInformationWealsoreviewedCFMSBNo.CFM56-5BS/B72-0308.OperatorssubjecttothisADarerequiredtofollowdifferentinitialandrepetitiveinspectionintervalsdependingonwhetherCFMSBNo.CFM56-5BSIB72-0308hasbeenapplied.CostsofComplianceWeestimatethatthisADaffectsabout94enginesinstalledonairplanesofU.S.registry.Wealsoestimatethatitwilltakeabout3hoursperenginetodotheinspection.Theaveragelaborrateis$85perhour.Basedonthesefigures,weestimatethecostofthisADonU.S.operatorstobe$23,970.AuthorityforthisRulemakingTitle49oftheUnitedStatesCodespecifiestheFAA'sauthoritytoissuerulesonaviationsafety.SubtitleI,section106,describestheauthorityoftheFAAAdministrator.SubtitleVII:AviationPrograms,describesinmoredetailthescopeoftheAgency'sauthority.WeareissuingthisrulemakingundertheauthoritydescribedinSubtitleVII,PartA,SubpartIII,Section44701:"Generalrequirements."Underthatsection,CongresschargestheFAAwithpromotingsafeflightofcivilaircraftinaircommercebyprescribingregulationsforpractices,methods,andprocedurestheAdministratorfindsnecessaryforsafetyinaircommerce.Thisregulationiswithinthescopeofthatauthoritybecauseitaddressesanunsafeconditionthatislikelytoexistordeveloponproductsidentifiedinthisrulemakingaction.RegulatoryFindingsThisADwillnothavefederalismimplicationsunderExecutiveOrder13132.ThisADwillnothaveasubstantialdirecteffectontheStates,ontherelationshipbetweenthenationalgovernmentandtheStates.oronthedistributionofpowerandresponsibilitiesamongthevariouslevelsofgovernment.4Forthereasonsdiscussedabove,IcertifythatthisAD:(1)Isnota"significantregulatoryaction"underExecutiveOrder12866,(2)Isnota"significantrule"underDOTRegulatoryPoliciesandProcedures(44FR11034,February26,1979),(3)WillnotaffectintrastateaviationinAlaskatotheextentthatitjustifiesmakingaregulatorydistinction,and(4)Willnothaveasignificanteconomicimpact,positiveornegative,onasubstantialnumberofsmallentitiesunderthecriteriaoftheRegulatoryFlexibilityAct.ListofSubjectsin14CFRPart39Airtransportation,Aircraft,Aviationsafety,Incorporationbyreference,Safety.AdoptionoftheAmendmentAccordingly,undertheauthoritydelegatedtomebytheAdministrator,theFAAamends14CFRpart39asfollows:PART39-AIRWORTHINESSDIRECTIVES1.Theauthoritycitationforparthttp//www.continentalsanantonio.com39continuestoreadasfollows:Authority:49U.S.C.106(g),40113,44701.§39.13[Amended)2.TheFAAamends§39.13byaddingthefollowingnewairworthinessdirective(AD):2016-02-04CFMInternationalS.A.:Amendment39-18383;DocketNo.FAA-2015-2893;DirectorateIdentifier2015-NE-20-AD.(a)EffectiveDateThisADiseffective[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].5(b)AffectedADsNone.(c)ApplicabilityThisADappliestoCFMInternationalS.A.(CFM)CFM56-5Bengineswithturbinerearframe(TRF),partnumber(PIN)338-102-907-0orPIN338-102-908-0,installed.(d)UnsafeConditionThisADwaspromptedbyacorrectedlifinganalysisbytheenginemanufacturerthatshowstheneedforaninitialandrepetitiveinspectionofcertainPINTRFsonthelow-pressureturbine(LPT)frameassembly.WeareissuingthisADtopreventfailureoftheTRFontheLPTframeassembly,whichcouldleadtoengineseparation,damagetotheengine,anddamagetotheairplane.(e)ComplianceComplywiththisADwithinthecompliance timesspecified,unlessalreadydone.(1)ForEnginesthathaveAppliedCFMServiceBulletin(SB)No.CFM56-SBSIB72-0308:(i)Priortoaccumulating25,000cyclessincenew(CSN)ontheTRFoftheLPTframeassemblyorwithin150cyclesaftertheeffectivedateofthisAD,whicheveroccurslater,performaninitialeddycurrentinspection(ECI)oraf1uorescentpenetrantinspection(FPI)oftheTRFmountstrutsontheLPTassembly.(ii)ForengineswithunknownCSNontheTRFoftheLPTframeassembly,performtheinitialinspectionrequiredbythisADwithin150cycles-in-service(CIS)aftertheeffectivedateofthisAD.(iii)Useparagraph3.8.intheAccomplishmentInstructionsofCFMSBNo.CFM56-5BSIB72-0850,datedDecember19,2012,todotheEClandparagraph3.C.intheAccomplishmentInstructionsofCFMSBNo.CFM56-5BSIB72-0850,todothe6FPI.DonotincludeTRFmountstrutcracklengthstowardsthecumulativecracklengthafterthecracksarerepaired.(iv)IfnocracksarefoundonanyofthethreeTRFmountstruts,repeattheinspectionwithin1,670cyclessincelastinspection(CSLI)orpriortoaccumulating25,000CSNontheTRFoftheLPTassembly,whicheveroccurslater.(v)IfthecumulativelengthofallcracksfoundatanyTRFmountstrutlocationislessthan0.20inches,repeattheinspectionwithin1,670cyclesCSLI.(vi)IfthecumulativelengthofcracksfoundatanyTRFmountstrutlocationisgreaterthanorequalto0.20inches,butlessthan0.25inches,repeattheinspectionwithin280CSLI.(vii)IfthecumulativelengthofcracksfoundatanyTRFmountstrutlocationis0.25inchesorgreater,replacetheTRFwithaparteligibleforinstallationbeforefurtherflight.(2)ForEnginesthathaveNotAppliedCFMSBNo.CFM56-5BSIB72-0308:(i)Priortoaccumulating32,000CSNontheTRFoftheLPTframeassemblyorwithin150cyclesaftertheeffectivedateofthisAD,whicheveroccurslater,performaninitialECIorFPIoftheTRFmountstrutsontheLPTframeassembly.(ii)ForengineswithunknownCSNontheTRFoftheLPTframeassembly,performtheinitialinspectionrequiredbythisADwithin150CISaftertheeffectivedateofthisAD.(iii)Useparagraph3.8.intheAccomplishmentInstructionsofCFMSBNo.CFM56-5BSIB72-0850,datedDecember19,2012,todotheECIandparagraph3.C.intheAccomplishmentInstructionsofCFMSBNo.CFM56-5BSIB72-0850,todotheFPI.DonotincludeTRFmountstrutcracklengthstowardsthecumulativecracklengthafterthecracksarerepaired.7(iv)IfnocracksarefoundonanyofthethreeTRFmountstruts,repeattheinspectionwithin2,500CSLIorpriortoaccumulating32,000CSNontheTRFoftheLPTassembly,whicheveroccurslater.(v)IfthecumulativelengthofcracksfoundatanyTRFmountstrutlocationislessthan0.20inches,repeattheinspectionwithin2,500CSLI.(vi)IfthecumulativelengthofcracksfoundatanyTRFmountstrutlocationisgreaterthanorequalto0.20inchesandlessthan0.25inches,repeattheinspectionwithin370CSLI.(vii)IfthecumulativelengthofcracksfoundatanyTRFmountstrutlocationis0.25inchesorgreater,replacetheTRFwithaparteligibleforinstallationbeforefurtherflight.(f)AlternativeMethodsofCompliance(AMOCs)TheManager,EngineCertificationOffice,FAA,mayapproveAMOCsforthisAD.Usetheproceduresfoundin14CFR39.19tomakeyourrequest.Youmayemailyourrequestto:ANE-AD-AMOC@faa.gov.(g)RelatedInformation(1)Formoreinfom1ationaboutthisAD,contactKyleGustafson,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA01803;phone:781-238-7183;fax:781-238-7199;email:kyle.gustafson@faa.gov.(2)CFMSBNo.CFM56-5BSIB72-0308,whichisnotincorporatedbyreferenceinthisAD,canbeobtainedfromCFM,usingthecontactinformationinparagraph(h)(4)ofthisAD.8(h)MaterialIncorporatedbyReference(1)TheDirectoroftheFederalRegisterapprovedtheincorporationbyreference(IBR)oftheserviceinformationlistedintlusparagraphunder5U.S.C.552(a)and1CFRpart51.(2)YoumustusethisserviceinformationasapplicabletodotheactionsrequiredbythisAD,unlesstheADspecifiesotherwise.(3)ThefollowingserviceinformationwasapprovedforIBRon[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].(i)CFMInternationalS.A.(CFM)ServiceBulletinNo.CFM56-5BSIB72-0850,datedDecember19,2012.(ii)Reserved.(4)ForCFMserviceinformationidentifiedinthisAD,contactCFMInternationalInc.,AviationOperationsCenter,1NeumannWay,MIDRoom285,Cincinnati,OH45125;phone:877-432-3272;fax:877-432-3329;email:aviation.fleetsupport@ge.com.(5)YoumayviewthisserviceinformationattheFAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA.ForinformationontheavailabilityofthismaterialattheFAA,call781-238-7125.(6)YoumayviewtlusserviceinformationattheNationalArchivesandRecordsAdministration(NARA).ForinformationontheavailabilityofthismaterialatNARA,call202-741-6030,orgoto:http://www.archives.gov/federal-register/cfr/ibrlocations.html.9

# Gaetano Sciortino, Acting Directorate

Manager,

Engine

& 

# Propeller Directorate, Aircraft Certification

Service.

10