DEPARTMENTOFTRANSPORTATIONFederalAviationAdministration14CFRPart39[DocketNo.FAA-2009-1100;DirectorateIdentifier2009-NE-37-AD]RJN2120-AA64[4910-13-P]AirworthinessDirectives;InternationalAeroEnginesAGTurbofanEnginesAGENCY:FederalAviationAdministration(FAA),DOT.ACTION:Noticeofproposedrulemaking(NPRM).SUMMARY:Weproposetosupersedeairworthinessdirective(AD)2012-09-09thatappliestoallInternationalAeroEnginesAG(IAE)V2500-A1,V2525-D5,andV2528-D5turbofanengines,andcertainserialnumbers(SINs)ofiAEV2522-A5,V2524-A5,V2527-A5,V2527E-A5,V2527M-A5,V2530-A5,andV2533-A5turbofanengines.AD2012-09-09currentlyrequirescleaning,eddycurrentinspection(ECI)orfluorescentpenetrantinspection(FPI),andinitialandrepetitiveultrasonicinspections(USis)ofcertainhigh-pressurecompressor(HPC)stage3to8drums,aswellasreplacementofthedrumattachmentnuts.SinceweissuedAD2012-09-09,wediscoveredthatadditionalattachmentnutsforcertainHPCstage3to8drumsareaffected.ThisproposedADwouldexpandtheaffectedpopulationforinitialandrepetitiveUSisoftheHPCstage3to8drum,revisetheinspectionintervals,requireremovaloftheaffectedattachmentnutsandanyHPCstage3to8drumfoundcracked,andrequireamandatoryterminatingaction.WeareproposingthisADtopreventfailureoftheHPCstage3to8drum,whichcouldresultinuncontaineddrumfailure,damagetotheengine,anddamagetotheairplane.DATES:WemustreceivecommentsonthisproposedADby[INSERTDATE60DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER).ADDRESSES:Youmaysendcomments,usingtheproceduresfoundin14CFR11.43and11.45,byanyofthefollowingmethods:•FederaleRulemakingPortal:Gotohttp://www.regulations.gov.Followtheinstructionsforsubmittingcomments.•Fax:202-493-2251.•Mail:U.S.DepartmentofTransportation,DocketOperations,M-30,WestBuildingGroundFloor,RoomW12-140,1200NewJerseyAvenueSE.,Washington,DC20590.•HandDelivery:DelivertoMailaddressabovebetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.ForserviceinformationidentifiedinthisNPRM,contactInternationalAeroEnginesAG,400MainStreet,EastHartford,CT06118;phone:860-368-3700;fax:860-368-4600;email:iaeinfo@iaev2500.com;Internet:https://www.iaeworld.com.YoumayviewthisserviceinformationattheFAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA.ForinformationontheavailabilityofthismaterialattheFAA,call781-238-7125.ExaminingtheADDocketYoumayexaminetheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2009-1100;orinpersonattheDocketManagementFacilitybetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.TheADdocketcontainsthisNPRM,theregulatoryevaluation,anycommentsreceived,andotherinformation.ThestreetaddressfortheDocketOffice(phone:800-647-5527)isintheADDRESSESsection.CommentswillbeavailableintheADdocketshortlyafterreceipt.FORFURTHERINFORMATIONCONTACT:MartinAdler,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,12NewEngland2ExecutivePark,Burlington,MA01803;phone:781-238-7157;fax:781-238-7199;email:martin.adler@faa.gov.SUPPLEMENTARYINFORMATION:CommentsInvitedWeinviteyoutosendanywrittenrelevantdata,views,orargumentsaboutthisNPRM.SendyourcommentstoanaddresslistedundertheADDRESSESsection.Include"DocketNo.FAA-2009-1100;DirectorateIdentifier2009-NE-37-AD"atthebeginningofyourcomments.Wespecificallyinvitecommentsontheoverallregulatory,economic,environmental,andenergyaspectsofthisNPRM.WewillconsiderallcommentsreceivedbytheclosingdateandmayamendthisNPRMbecauseofthosecomments.Wewillpostallcommentswereceive,withoutchange,tohttp://www.regulations.gov,includinganypersonalinformationyouprovide.WewillalsopostareportsummarizingeachsubstantiveverbalcontactwereceiveaboutthisNPRM.DiscussionOnMay2,2012,weissuedAD2012-09-09,Amendment39-17044(77FR30371,May23,2012),("AD2012-09-09"),forallIAEV2500-A1,V2525-D5,andV2528-D5turbofanengines,andcertainSINsofiAEV2522-A5,V2524-A5, V2527-A5,V2527E-A5,V2527M-A5,V2530-A5,andV2533-A5turbofanengines.AD2012-09-09requirescleaning,ECIorFPT,andinitialandrepetitiveUSisofcertainHPCstage3to8drums,aswellasreplacementofthedrumattachmentnuts.AD2012-09-09resultedfrominspectionsthatfound50HPCdrumswith cracksandreportsthatindicatedthattherequiredinspectionintervalswerenotadequate.WeissuedAD2012-09-09topreventuncontainedfailureoftheHPCstage3to8drum,whichcouldresultindamagetotheairplane.3ActionsSinceAD2012-09-09WasIssuedSinceweissuedAD2012-09-09,wediscoveredthatpartiallysilver-platednutsforcertainHPCstage3to8drumscausethedrumtocorrodeandcrack.IAEhasalsodevelopedanewnutdesignwithoutsilverplating.RelevantServiceInformationWereviewedIAEAlertNon-ModificationServiceBulletin(NMSB)No.V2500-ENG-72-0615,Revision6,datedSeptember4,2014;IAENMSBNo.V2500-ENG-72-0625,datedSeptember20,2011;andIAENMSBNo.V2500-ENG-72-0637,datedMay2,2013.IAEAlertNMSBNo.V2500-ENG-72-0615describesproceduresforperformingaUSIoftheHPCstage3to8drum.IAENMSBNo.V2500-ENG-72-0625providesguidanceonperforminganECIthatwillimprovetheabilitytodetectcrackedHPCstage3to8drums.IAENMSBNo.V2500-ENG-72-0637describesproceduresforperforminganFPIoftheHPCstage3to8drum.FAA'sDeterminationWeareproposingthisADbecauseweevaluatedalltherelevantinformationanddeterminedtheunsafeconditiondescribedpreviouslyislikelytoexistordevelopinotherproductsofthesametypedesign.ProposedADRequirementsThisproposedADwouldexpandtheaffectedpopulationforinitialand repetitiveUSIsoftheHPCstage3to8drum,revisetheinspectionintervals,requireremovalofaffectedattachmentnuts,andrequireremovalofanyHPCstage3to8drumsfoundcracked.Asmandatoryterminatingaction,thisproposedADwouldrequireinstallationofanHPCstage3to8drumthathasneveroperatedwithsilver-platednutsusingsilver-freenutstoattachtheHPCstage3to8drumtotheHPCstage9to12drum.4CostsofComplianceWeestimatethatthisproposedADaffects956enginesinstalledonairplanesofU.S.registry.Weestimatethatitwouldtakeabout3hoursperenginetoperformtheUSIandabout2hoursperenginetoperformtheFPIorECIoftheHPCstage3to8drum.WealsoestimatethatremovingsilverresiduefromtheHPCstage3to8drumwouldcostabout$2,600perengine,andrequiredpartswouldcostabout$1,060perengine.Weestimatethepro-ratedreplacementcosttoreplaceanHPCstage3to8drumtobe$52,014.Basedonthesefigures,weestimatethecostofthisproposedADonU.S.operatorstobe$53,630,644.AuthorityforthisRulemakingTitle49oftheUnitedStatesCodespecifiestheFAA'sauthoritytoissuerulesonaviationsafety.SubtitleI,Section106,describestheauthorityoftheFAAAdministrator.SubtitleVII,AviationPrograms,describesinmoredetailthescopeoftheAgency'sauthority.WeareissuingthisrulemakingundertheauthoritydescribedinSubtitleVII,PartA,SubpartIII,Section44701,"Generalrequirements."Underthatsection,CongresschargestheFAAwithpromotingsafeflightofcivilaircraftinaircommercebyprescribingregulationsforpractices,methods,andprocedurestheAdministratorfindsnecessaryforsafetyinaircommerce.Thisregulationiswithinthescopeofthatauthoritybecauseitaddressesanunsafeconditionthatislikelytoexistordeveloponproductsidentifiedinthisrulemakingaction.RegulatoryFindingsWehavedeterminedthatthisproposedADwouldnothavefederalismimplicationsunderExecutiveOrder13132.ThisproposedADwouldnothaveasubstantialdirecteffectontheStates,ontherelationshipbetweenthenationalGovernmentandtheStates,oronthedistributionofpowerandresponsibilitiesamongthevariouslevelsofgovernment.5For

the reasons discussed

above,

I certify

that

the proposed regulation: (1)

Is not

a "significant

regu

l atory action"

under Executive

Order

12866, (2)

Is not

a "s ignificant

rule

" under

the DOT Regulatory

Policies

and Procedure

s (4

4 FR 11034

, February26

, 1979

), (3) Will

not affect intrastate

aviation

in Alaska

to the extent

that

it justifies making

a regulatory distinction,

and (4) Will

not have

a significant

economic

impact,

positive

or negative,

on

a substantial

number

of small entities

under

the criteria

of the Regulatory

Flexibility

Act. L

i st

of

S ubj

ec

t

s

i n

14

C FR Part

3

9 Air transportation,

Aircraft,

Aviatio

n safety, Incorporation

by reference,

Safety. Th

e Pr opose

d

A m

e ndm

e nt Accordingly

, under

the authority delegated

to me

by

the Administrator,

the FAA proposes

to amend

14 CF

R part

39

as follows: PART

3

9

- A IRWORTHI

NESS

DI RECT

I VE

S I. The authority

citation

for part

39 continues

to read

as follows: Authority:

49 U.S.C.

106(g), 40113,44701. § 39.13

! A m

e nd

ed

) 2. The FAA amends§

39.13

by

r emovi

ng airworthiness

directive

(A

D

) 2012-09- 09, Amendment

39-17044

(77

FR 30371,

May

23,

20

1 2), and adding

the following

new AD: I n ter

n at

i o

n

a

l Aero Engines

AG: Docket

No. FAA-2009-1100;

Directorate Identifier 2009-NE-37-A

D. (a) Comments

Due

Date The FAA

must receive comments

on this

AD action

by [INSERT

DATE

60 DAYS AFTER

DATE

OF PUBLICATION

IN THE FEDERAL REGISTER]. 6(b)AffectedADsThisADreplacesAD2012-09-09,Amendment39-17044(77FR30371,May23,2012).(c)ApplicabilityThisADappliesto:(1)AllInternationalAeroEnginesAG(IAE)V2500-Alturbofanengines;and(2)AllIAEV2525-D5andV2528-D5turbofanengines;and(3)IAEV2522-A5,V2524-A5,V2527-A5,V2527E-A5,V2527M-A5,V2530-A5,andV2533-A5turbofanengineswithserialnumbers(SINs)V10001throughVl3190,andV15001throughV16728,excludingVl6707.(d)UnsafeConditionThisADwaspromptedbythediscoverythatadditionalattachmentnutsforcertainHPCstage3to8drumscausethedrumtocorrodeandcrack.WeareissuingthisADtopreventfailureoftheHPCstage3to8drum,whichcouldresultinuncontaineddrumfailure,damagetotheengine,anddamagetotheairplane.(e)ComplianceComplywiththisADwithinthecompliance timesspecified,unlessalreadydone.Useparagraph3.A.ofiAEAlertNon-ModificationServiceBulletin(NMSB)No.V2500-ENG-72-A0615,Revision6,datedSeptember4,2014,todotheultrasonicinspection(USI)requiredbythisAD.Youmayusetheinspectionslistedinparagraph(g)(3)ofthisAD.insteadofaUSIfortheinitialinspectionrequiredbyparagraphs(e)(l)through(e)(S)ofthisAD.IfcracksarefoundduringanyoftheinspectionsrequiredbythisAD,removethedrumfromservicebeforefurtherflight.(1)InitialUSIoftheHPCstage3to8drum-Group"A"andGroup"B":ForIAEV2500-AlturbofanengineswithSINslistedin"GroupA"or"GroupB"inparagraphl.E.inIAEAlertNMSBNo.V2500-ENG-72-A0615,Revision6,dated7September4,2014,performaninitialUSIoftheHPCstage3to8drumwithin200cyclesofaccumulating8,000cycles-since-new(CSN)orwithin200cyclesfromtheeffectivedateofthisAD,whicheveroccurslater.(2)InitialUSIoftheHPCstage3to8drum-Group"C":ForIAEV2SOO-ASturbofanengineswithSINslistedin"GroupC"inparagraphl.E.inIAEAlertNMSBNo.V2SOO-ENG-72-A061S,Revision6,datedSeptember4,2014,performaninitialUSIoftheHPCstage3to8drumwithin200cyclesofaccumulating6,2SOCSNorwithin200cyclesfromtheeffectivedateofthisAD,whicheveroccurslater.(3)InitialUSIoftheHPCstage3to8drum-Group"D":ForIAEV2SOO-ASturbofanengineswithSINslistedin"GroupD"inparagraphl.E.inIAEAlertNMSBNo.V2SOO-ENG-72-A061S,Revision6,datedSeptember4,2014,performaninitialUSIoftheHPCstage3to8drumwithin200cyclesofaccumulating3,7SOCSNorwithin200cyclesfromtheeffectivedateofthisAD,whicheveroccurslater.(4)InitialUSIoftheHPCstage3to8drum-Group"E":ForIAEV2SOO-AI,-AS,and-OSturbofanenginesnotlistedin"GroupA,""GroupB,""GroupC,"or"GroupD,"andwithdrumassemblypartnumbers(PINs)listedin"GroupE"inparagraphI.E.inIAEAlertNMSBNo.V2500-ENG-72-A0615,Revision6,datedSeptember4,2014,performaninitialUSIoftheHPCstage3to8drumwithin200cyclesofaccumulating12,500CSNorwithin200cyclesfromtheeffectivedateofthisAD,whicheveroccurslater.(5)InitialUSIoftheHPCstage3to8drum-Group"F":ForIAEV2500-A1,-AS,and-D5turbofanenginesnotlistedin"GroupA,""GroupB,""GroupC,"or''GroupD,"andwithdrumassemblyPINslistedin'·GroupF"inparagraphI.E.inIAEAlertNMSBNo.V2500-ENG-72-A061S,Revision6,dated8September4,2014,performaninitialUSIoftheHPCstage3to8drumwithin200cyclesofaccumulating9,000CSNorwithin200cyclesfromtheeffectivedateofthisAD,whicheveroccurslater.(f)RepetitiveUSisoftheHPCStage3to8Drum(1)Forenginesincludedin"GroupA,""GroupB,"''GroupC,""GroupE,"or"GroupF,"asdefinedinparagraph(e)ofthisAD,performrepetitiveUSisoftheHPCstage3to8drumwithinevery750cyclesofthelastUSI.(2)Forenginesincludedin"GroupD,"asdefinedinparagraph(e)ofthisAD,performrepetitiveUSisoftheHPCstage3to8drumwithinevery500cyclesofthelastUSI.(3)IfyouinspecttheHPCstage3to8drumatshopvisit,youmaydelaythenextUSIasshowninthe"GracePeriodsTable"foreachcompliancegrouplistedinparagraph1.E.inIAEAlertNMSBNo.V2500-ENG-72-A0615,Revision6,datedSeptember4,2014.(g)RemovalofSilver-PlatedNutsUnlessalreadydone,atthenextpiece-partexposureoftheHPCstage3to8drumaftertheeffectivedateofthisAD,dothefollowingbeforereturninganyHPCstage3to8drumtoservice:(1)Removefromserviceallsilver-platednuts(fullyorpartially-plated),PINsAS44862orAS64367,thatattachtheHPCstage3to8drumtotheHPCstage9to12drum.(2)RemovethesilverresiduefromtheHPCstage3to8drum.(3)PerformaninspectionoftheHPCstage3to8drumusingatleastoneofthefollowingmethods:(i)Fluorescentpenetrantinspection(FPI)oftheHPCstage3to8drumforcracks,or9(ii)Eddycurrentinspection(ECI)oftheHPCstage3to8drumforcracks.(h)InstallationProhibitionAftertheeffectivedateofthisAD,donotinstallanysilver-platednuts,PINAS44862orAS64367,intoanyengine.(i)MandatoryTerminatingActionWithin9,450cyclesaftertheeffectivedateofthisAD,install:(1)anHPCstage3to8drumthathasneveroperatedwithsilver-platednuts(fullyorpartiallyplated)toattachtheHPCstage3to8drumtotheHPCstage9to12drum,with(2)silver-freenutstoattachtheHPCstage3to8drumtotheHPCstage9to12drum.U)DefinitionForthepurposeofthisAD,"piece-partexposure"isremovaloftheHPCstage3to8drumfromtheengine,removalofallbladesfromthedrum,andseparationoftheHPCstage3to8drumfromthestage9to12drum.(k) CreditforPreviousActionsIfyouperformedaninspectionoftheHPCstage3to8drumbeforetheeffectivedateofthisADusingoneofthefollowingIAENMSBs,youmettheinitialinspectionrequirementofparagraph(e)ofthisAD:(i)IAENMSBNo.V2500-ENG-72-0594,Revision3,datedAugust7,2009,throughRevision6,datedApril12,2010.(ii)IAENMSBNo.V2500-ENG-72-0603,Revision2,datedMarch17,2010,orearlierrevisions.(iii)IAENMSBNo.V2500-ENG-72-0608,Revision3,datedSeptember20,2011,orearlierrevisions.10(iv)IAENMSBNo.V2500-ENG-72-0615,Revision5,datedAugust5,2014,orearlierrevisions.(v)IAENMSBNo.V2500-ENG-72-0638,InitialIssue,datedApril11,2013.(I)AlternativeMethodsofCompliance(AMOCs)TheManager,EngineCertificationOffice,FAA,mayapproveAMOCsforthisAD.Usetheproceduresfoundin14CFR39.19tomakeyourrequest.Youmayemailyourrequestto:ANE-AD-AMOC@faa.gov.(m)RelatedInformation(1)FormoreinformationaboutthisAD,contactMartinAdler,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA01803;phone:781-238-7157;fax:781-238-7199;email:martin.adler@faa.gov.(2)IAENMSBNo.V2500-ENG-72-0637,datedMay2,2013;IAENMSBNo.V2500-ENG-72-0625,datedSeptember20,2011;IAEEngineManualTask72-41-11-200-001;andIAEEngineManualTask72-41-11-110-001,whicharenotincorporatedbyreferenceinthisAD,canbeobtainedfromIAE,usingthecontactinformationinparagraph(m)(3)ofthisproposedAD.IAENMSBNo.V2500-ENG-72-0637andIAEEngineManualTask72-41-11-200-001provideguidanceonperformingtheFPI.GuidanceonperformingtheECIcanbefoundinIAENMSBNo.V2500-ENG-72-0625.IAEEngineManualTask72-41-11-110-001providesguidanceoncleaningtheHPCstage3to8drum.(3)ForserviceinformationidentifiedinthisAD,contactInternationalAeroEnginesAG,400MainStreet,EastHartford,CT06118;phone:860-368-3700;fax:860-368-4600;email:iaeinfo@iaev2500.com;Internet:https://www.iaeworld.com.11(4)YoumayviewthisserviceinformationattheFAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA.ForinformationontheavailabilityofthismaterialattheFAA,ca11781-238-7125.IssuedinBurlington,Massachusetts,onDecember16,2014.ColleenM.D'Alessandro,AssistantManager,Engine&Directorate,AircraftCertificationService.12