[4910-13-P]DEPARTMENTOFTRANSPORTATIONFederalAviationAdministration14CFRPart39[DocketNo.FAA-2006-25970;DirectorateIdentifier99-NE-12-AD;Amendment39-18426;AD2016-05-08]RlN2120-AA64AirworthinessDirectives;TurbomecaS.A.TurboshaftEnginesAGENCY:FederalAviationAdministration(FAA),DOT.ACTION:Finalrule.SUMMARY:Wearesupersedingairworthinessdirective(AD)2006-23-17forcertainTurbornecaS.A.TurmoIVAandIVCturboshaftengines.AD2006-23-17requiredrepetitiveinspectionsofthecentrifugalcompressorintakewheel(inducer)bladesforcracksandcorrosion,replacementofpartsthatfailinspection,andreplacementoftheTU197standardcentrifugalcompressor.ThisADrequiresthesameinspections,butatrevisedintervals,addsthereplacementoftheTU215standardcentrifugalcompressor,andrequiresreplacementofpmtsthatfailinspection.ThisADwaspromptedbyacentrifugalcompressorinducerbladeloss.ThisADwasalsopromptedbyaTurbornecaS.A.reviewoftheengineserviceexperienceandtheirdetenninationthatmorefrequentborescopeinspections(BSis)arerequiredonenginesnotmodifiedtotheTU191,TU197,orTU224standard.WeareissuingthisADtopreventfailureofthecentrifugalcompressorinducer,whichcouldleadtoanuncontainedbladerelease,damagetotheengine,anddamagetotheairplane.DATES:ThisADiseffective[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].TheDirectoroftheFederalRegisterapprovedtheincorporationbyreferenceofacertainpublicationlistedinthisADasof[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].ADDRESSES:ForserviceinformationidentifiedinthisAD,contactTurbomecaS.A.,40220Tarnos,France;phone:33(0)559744000;fax:33(0)559744515.YoumayviewthisserviceinformationattheFAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA.ForinformationontheavailabilityofthismaterialattheFAA,call781-238-7125.ItisalsoavailableontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2006-25970.ExaminingtheADDocketYoumayexaminetheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2006-25970;orinpersonattheDocketManagementFacilitybetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.TheADdocketcontainsthisAD,themandatorycontinuingairworthinessinformation,regulatoryevaluation,anycommentsreceived,andotherinformation.TheaddressfortheDocketOffice(phone:800-647-5527)isDocumentManagementFacility,U.S.DepartmentofTransportation,DocketOperations,M-30,WestBuildingGroundFloor,RoomW12-140,1200NewJerseyAvenueSE.,Washington,DC20590.FORFURTHERJNFORMATIONCONTACT:KennethSteeves,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,1200DistrictAvenue,2

# Burlington,

MA 01803;

phone: 781-238-7765;

fax: 781-238-7199;

email: kenneth.steeves@faa.gov. 

# SUPPLEMENTARY

INFORMATION: Discussion

We issued

a notice

of proposed rulemaking

(NPRM)

to amend

14 CFR

part

39

to supersede

AD 2006-23-17,

Amendment

39-14829

(71

FR 66664, November

16, 2006), ("AD 2006-23-17").

AD 2006-23-17

applied

to the specified

products.

The NPRM published

in the Federal Register

on November

25, 2015

(80

FR 73681).

The NPRM proposed

to require

the same inspections,

but

at revised intervals,

add

the replacement

of the

TU

215 standard centrifugal compressor,

and require replacement

of parts

that

fail inspection. Comments

We gave

the public

the opportunity

to participate

in developing

this

AD.

We received

no comments

on the NPRM

(80

FR 73681, November

25, 2015). Conclusion

We reviewed

the available

data

and determined

that

air safety

and

the public interest

require adopting

this

AD

as proposed. Related

Service Information

under

1 CFR

Part

51 We reviewed Turbomeca

S.A. Alert Mandatory

Service

Bulletin

(MSB)

No. A249 72 0100, Version

H, dated

May

21, 2015.

The Alert

MSB describes procedures

for

the inspection

and replacement

of the centrifugal compressor

inducer

blades.

This service information

is reasonably

available

because

the interested

parties

have access

to

it through their normal

course

of business

or

by

the means identified

in the ADDRESSES

section. 

# 3CostsofComplianceWeestimatethatthisADaffects36enginesinstalledonairplanesofU.S.registry.Weestimatethattwoofthese engineswillrequirecompressorreplacement.Wealsoestimatethatabout40hoursperenginearerequiredtocomplywiththisAD.Theaveragelaborrateis$85perhour.Partscostabout$40,000perengine.Basedonthesefigures,weestimatethecostofthisADonU.S.operatorstobe$202,400.AuthorityforthisRulemakingTitle49oftheUnitedStatesCodespecifiestheFAA'sauthoritytoissuerulesonaviationsafety.SubtitleI,Section106,describestheauthorityoftheFAAAdministrator.SubtitleVII,AviationPrograms,describesinmoredetailthescopeoftheAgency'sauthority.WeareissuingthisrulemakingundertheauthoritydescribedinSubtitleVII,PartA,SubpartIII,Section44701,"Generalrequirements."Underthatsection,CongresschargestheFAAwithpromotingsafeflightofcivilaircraftinaircommercebyprescribingregulationsforpractices,methods,andprocedurestheAdministratorfindsnecessaryforsafetyinaircommerce.Thisregulationiswithinthescopeofthatauthoritybecauseitaddressesanunsafeconditiontl1atislikelytoexistordeveloponproductsidentifiedinthis rulernakingaction.RegulatoryFindingsThisADwillnothavefederalismimplicationsunderExecutiveOrder13132.ThisADwillnothaveasubstantialdirecteffectontheStates,ontherelationshipbetweenthenationalgovernmentandtheStates,oronthedistributionofpowerandresponsibilitiesamongthevarious levelsofgovernment.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,theFAAamendspart39oftheFederalAviationRegulations(14CFRpart39)asfollows:PART39-AIRWORTHINESSDIRECTIVES1.Theauthoritycitationforpart39continuestoreadasfollows:Authority:49U.S.C.I06(g),40113,44701.§39.13[Amended]2.TheFAAamends§39.13byremovingairworthinessdirective(AD)2006-23-17,Amendment39-14829(71FR66664,November16,2006)("2006-23-I7"),andaddingthefollowingnewAD:2016-05-08TurbomecaS.A.:Amendment39-18426;DocketNo.FAA-2006-25970;DirectorateIdentifier99-NE-12-AD.5(a)EffectiveDateThisADiseffective[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].(b)AffectedADsThisADreplacesAD2006-23-17.(c)ApplicabilityThisADappliestoTurbomecaS.A.TurmoIVAandIVCturboshaftengines.(d)UnsafeConditionThisADwaspromptedbyacentrifugalcompressorinducerbladeloss.WeareissuingthisADtopreventfailureofthecentrifugalcompressorinducer,whichcouldleadtoanuncontainedbladerelease,damagetotheengine,anddamagetotheairplane.(e)ComplianceComplywiththisADwithinthecompliancetimesspecified,unlessalreadydone.(1)RemovetheTU197andTU215standardcentrifugalcompressorsandinstalltheTU224standardcentrifugalcompressor,within30daysaftertheeffectivedateofthisAD.(2)Performinitialandrepetitiveultrasonicinspections(Uis)oreddycurrentinspections(ECis)ofthecentrifugalcompressor(inducer).UseAccomplishmentInstructions,paragraph6.B.(l)(b)ofTurbomecaS.A.AlertMandatoryServiceBulletin(MSB)No.A249720100,VersionH,datedMay21,2015todotheinspections.UseAppendixIofTurbomecaS.A.AlertMSBNo.A249720I00,VersionH,datedMay21,2015forthescheduleofinspections.6(3)Performinitialandrepetitiveborescopeinspections(BSis)ofthecentrifugalcompressorinducer.UseAccomplishmentInstructions,paragraphs6.B.(1)(a)ofTurbomecaS.A.AlertMSBNo.A249720100,VersionH,datedMay21,2015todotheinspections.UseAppendix1ofTurbomecaS.A.AlertMSBNo.A249720100,VersionH,datedMay21,2015forthescheduleofinspections.(4)If,duringanyinspectionrequiredbyparagraphs(e)(2)or(e)(3)ofthisAD,anycrack,corrosion,orotherdamageisdetectedontheinducer,thenbeforenextflight,replacethecentrifugal(5)AccomplishmentofaUIorECIofthecentrifugalcompressorinducer,requiredbyparagraph(e)(2)ofthisAD,isacceptableinlieuofaBSIrequiredbyparagraph(e)(3)ofthisADforthatengine.(6)Replacementofacentrifugalcompressorrequiredbyparagraph(e)(4)ofthisAD,doesnotconstituteterminatingactionfortherepetitiveinspectionsrequiredbyparagraphs(e)(2)and(e)(3)ofthisAD.(f)CreditforPreviousActionsYoumaytakecreditfortheinspectionsandcorrectiveactionsrequiredbyparagraphs( e)(2)and( e)(3)ofthisAD,ifyouperformedtheinspectionsandcorrectiveactionsbeforetheeffectivedateofthisAD,usingTurbomecaS.A.AlertMSBNo.A249720100,VersionG,oranearlierversion.(g)AlternativeMethodsofCompliance(AMOCs)TheManager,EngineCertificationOffice,FAA,mayapproveAMOCsforthisAD.Usetheproceduresfoundin14CFR39.19tomakeyourrequest.Youmayemailyourrequestto:ANE-AD-AMOC@faa.gov.7(h)RelatedInformationFormoreinformationaboutthisAD,contactKennethSteeves,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA01803;phone:781-238-7765;fax:781-238-7199;email:kenneth.steeves@faa.gov.(i)MaterialIncorporatedbyReference(1)TheDirectoroftheFederalRegisterapprovedtheincorporationbyreference(IBR)oftheserviceinformationlistedinthisparagraphunder5U.S.C.552(a)and1CFRpart51.(2)YoumustusethisserviceinformationasapplicabletodotheactionsrequiredbythisAD,unlesstheADspecifiesotherwise.(i)TurbomecaS.A.AlertMandatoryServiceBulletin(MSB)No.A249720100,VersionH,datedMay21,2015.(ii)Reserved.(3)ForTurbomecaS.A.serviceinformationidentifiedinthisAD,contactTurbomecaS.A.,40220Tarnos,France;phone:33(0)559744000;fax:33(0)559744515.(4)YoumayviewthisserviceinformationatFAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA.ForinformationontheavailabilityofthismaterialattheFAA,call781-238-7125.(5)YoumayviewthisserviceinformationattheNationalArchivesandRecordsAdministration(NARA).ForinformationontheavailabilityofthismaterialatNARA,8call202-741-6030,orgoto:http://\VWW.archives.gov/federal-register/cfr/ibrlocations.html.IssuedinBurlington,Massachusetts,onFebruary26,2016.ColleenM.D'Alessandro,Manager,Engine&PropellerDirectorate,AircraftCertificationService.9