Rolls-RoycePOBox31,DerbyDE24SBJ,EnglandTelephone:+44(0)1332242424Fax:+44(O)1332249936www.rolls-royce.comPetitionforExemptionfrom14C.F.R.§33.27(1)(6),Amendment31A.Name,AddressandContactInformationofthePetitionerRebeccaPeacock-AirworthinessSpecialistML-52Rolls-RoycepicPOBox31DerbyDE24BBJEnglandTel:(+44)1332249428rebecca.peacock@rolls-royce.comB.PertinentSectionoftheCodeofFederalRegulationsRolls-Royceherebypetitionsforanexemptionfrom14C.F.R.§33.27(f)(6).ThisexemptionisrequestedfortheHPshaftsystemonly,fortheTrent1000enginemodelsidentifiedinSectionCbelow.Thepertinentprovisionsof14C.F.R.§33.27are:14C.F.R.§33.27Turbine,compressor,fan,andturbosuperchargerrotoroverspeed.(f)Failureofashaftsectionmaybeexcludedfromconsiderationindeterminingthehighestoverspeedthatwouldresultfromacompletelossofloadonaturbinerotoriftheapplicant:{6)Doesnotexcludetheentireshaft.C.TheExemptionbeingsoughtRolls-Roycerequestsanexemptionfrom14C.F.R.§33.27(f)(6)fortheHPshaftsystemofthefollowingnewTrent1000enginemodels:ModelTrent1000-AETrent1000-CETrent1OOO-AE2Trent1000-CE2Ratingx1000lbs.64706470Inordertoaddressdiscrepanciesbetweentheenginenomenclatureusedinengineandaircraftcertificationdocumentation,thenewenginemodelsabove,knownas"EnhancedRatings",arebeingintroduced.MechanicallythenewmodelsareidenticaltotheexistingcertificatedTrent1000models,differingonlyinthethrustprofilescontainedintheenginecontroller.Thesethrustprofilesareverysimilartotheexistingmodels,anddonotaffecttheTake-Offthrustratingorequivalentbareenginetake-offthrust.Therearenochangestotheoperatinglimitsofthenewmodelscomparedtoexisting.Noexemptionissoughtforothershaftsystemsonthese,oranyother,enginemodels.TheHPshaftsystemwillcomplywith§33.27,subjecttothegrantingoftheexemptionfrom§33.27(f)(6)requestedherein.Relieffrom§33.27(f)(6)issoughtbecauseanalysishasfailedtoshowthatfailureoftheHPshaftsystemcanneverresultinoverspeedtoburst.ThedesignoftheHPshaftsystemisnotamenabletoanalysisbyshaftsection.Rolls-Roycethereforeseeksanexemptionfrom§33.27(f)(6)toexcludetheentireHPshaftsystemfromconsiderationindeterminingthehighestRolls-RoycepicRegisteredoffice:65BuckinghamGate,LondonSW1E6ATCompanynumber:1003142.RegisteredinEngland.Page1IRolls-Royceoverspeedthatwouldresultfromacompletelossofloadonaturbinerotor.However,asdemonstratedinSectionEbelow,thelevelofsafetyaffordedbycompliancewith§33.27fortheHPshaftsystemwillbeunaffectedbythegrantingofanexemptionfrom§33.27(f)(6).Insum,Rolls-Royceisrequestingthisexemptionbecausecompliancewith§33.27cannotbeshownabsentanexemptionfrom§33.27(f)(6).However,compliancecanbeshown,withatleastanequallevelofsafetytothatrequiredtomeet§33.27,iftheexemptionisgranted.D.StatementofPublicInterestGrantingthisexemptionwillpromoteandservethepublicinterestbecause:a.Thestate-of-the-artenginemodels(andtheHPshaftsystem)atissueinthispetitionrepresentthelatestgenerationofenginesandenginetechnologyfromtheTrentenginefamily.TheTrentlineofengineshasestablishedanoutstandingtrackrecordofperformanceandsafetyover41yearsandmorethan256millionserviceflighthours.Thus,theenginemodelsandshaftsystematissueinthispetitionarebasedonprovenexpertiseandin-service-verifieddesignstylesandpractices.Thisexperienceandtrackrecordhelpstoensurethereliabilityandsafetyoftheproduct.Asexplainedfurtherinthepointsimmediatelybelow,theintroductionoftheseenginemodelsintoservicewillgeneratevaluablepublicbenefits.b.Thegrantingoftherequestedexemptionwillexpeditetheentryintoserviceofsuperiorenginesandenginetechnologythatwillenhancethesafetyandreliabilityofairlineoperations,andincreasetheefficiencyofaircraftperformance,therebypromotingU.S.economicinterests(includingthoseofBoeing,U.S.airlines,andtheiremployeesandshareholders)aswellasthoseofthetravellingpublic,whilealsoreducingadverseeffectsontheenvironmentrelativetoolderenginetypesonotheraircraft.Alloftheseenhancementsconstitutesubstantialpublicbenefitsc.Thesestate-of-the-artenginemodelswillreducetheoperatingcostsofaircraft,andtheairlinesthatoperatethem,relativetocostsassociatedwithaircraftthatarecurrentlyinservice.SuchareductioninoperatingcostswillbenefitU.S.andinternationalairlines,theiremployeesandshareholders.Moreover,suchreducedoperatingcostsprovidetheopportunityforairlinestooffermoreandlessexpensiveairserviceoptionstothetravelingpublic.d.Certificationofthesestate-of-the-artenginemodels,whenoperatedintheBoeing787,willreducefuelburn,therebyreducingharmfulemissionssuchascarbondioxide(C02)andNOxfromlevelsexperiencedwithotherolderenginetypescurrentlyinserviceonotheraircraft.e.TheTrent1000isbuiltwithU.S.suppliedpartsthatconstituteapproximately16%oftheenginevalue.SalesoftheenginecontributetotheU.S.economy,supportU.S.jobs,andenhancetheU.S.balanceoftradeandgrossdomesticproduct,allofwhichpromotetheU.S.publicinterestf.TheTrent1000modelsareinstalledontheBoeing787-8and787-9whichhascustomersoutsidetheUnitedStates.SalesoftheenginecontributetotheU.S.economy,supportU.S.jobs,andenhancetheU.S.balanceoftradeandgrossdomesticproduct-allofwhichpromotetheU.S.publicinterest.g.CertificationoftheseTrent1000enginemodelsintheU.S.promotestheregulatorystandardsoftheU.S.asaglobalbenchmarkforairworthiness.PromotionoftheU.S.regulatorystandardsisinthepublicinterestasthisincreasesthenumberofgoodsandservicesavailabletoU.S.citizensthatarecompliantwiththeU.S.regulatorystandards,Rolls-RoycepicRegisteredoffice:65Buckingham Gate,LondonSW1E6ATCompanynumber:1003142.RegisteredInEngland.Page2IRolls-RoyceandsincemanycountriesvoluntarilyadoptU.S.standardsthisprocessdoesnotincreasetheburdenontheU.S.government.E.StatementofnoAdverseEffectonSafetyTheFAA'sgrantofthisrequestedexemptionwillhavenoadverseeffectonsafety.Compliancewith§33.27issignificantforsafetypurposesbecauseitdemonstratesthatanengine'srotorswillnotfailunderavaryingrangeofpotentialoperatingconditions.Therequirementscontainedin§33.27(f)aresignificantforsafetybecausethissubsectionallowsfailuresofshaftsectionstobeexcludedfromtherangeofconditionsconsideredunder§33.27,butonlyifadesignorganizationcandemonstratethattheriskofsuchshaftsectionfailuresissufficientlyremote.Subsection33.27(f)(6)doesnotinitselfimposeanyadditionalsafetyrequirement.Clearly,ifriskoffailureofthewholeshaftsystemisconsideredandshowntobeatleastasremoteasisacceptablefor"shaftsections,"thentheoveralllevelofsafetymustbeatleastequaltocircumstancesinwhichonly"shaftsections"areconsidered,asprovidedforunder§33.27(f).Subsection33.27(f)(6)wasincludedinSection33.27basedonahistoryoffailuresassociatedwithconventionalshaftsystems,whichraiseddoubtabouttheabilityofdesignorganizationstofullyassessthepotentialfailuremodes(andfailurerate)ofanentireshaftsystem.However,fortheHPshaftsystemoftheTrent1000(andindeedforotherRolls-Roycemodern3shaftengines),thisanalysiscanbecarriedoutwithhighfidelitybecause:a.TheHPshaftsystemdesignutilizedacrosstheTrentenginefamilydifferssignificantlyfromconventionalshaftsystems.Forexample,itfeaturesnobearingsoroilsystemcomponents,hashighstiffnessandsignificantclearancerelativetoothershafts;consequently,thethreatsassociatedwiththefeaturesofaconventionalshaftdonotapply.AFailureModeandEffectAnalysishasdeterminedthattherearenoknownorpotentialenvironmentalthreatstotheintegrityoftheHPshaftsystemcomponentsthatcouldleadtoalossofloadfailure.b.Inordertoensureahighlevelofintegrity,thespecialcontrolsappliedtothetorquetransmittingcomponents(i.e.,theHPCompressorRearDrumandtheHPTurbinediscoftheHPshaftsystem)areofahigherstandardthanthoseofmanyothershaftsystemsinthepast.Thesemandatedcontrolsaddress,butarenotlimitedto:1.Materialspecifications;2.Materialproperties(e.g.,lowcyclefatigue,highcyclefatigue,creep);3.Manufacturinginducedanomalies;4.Serviceinduceddamagetoleranceassessment;5.Safelifemandatoryinspections;and6.Mandatorycyclelifelimitation.c.Thetheoreticalassessmentofpoints1)and2)aboveissupportedbytheserviceexperienceoftheRolls-Roycethreeshaftfamilyofengines,allofwhichincorporatethesamedesignstylefortheHPshaftsystemastheTrent1000enginemodelsthatarethesubjectofthispetition.Overthecourseofmorethan256millionserviceflighthours,therehavebeennofailuresoftheHPshaftsystemtorquepathontheTrentfamilyofengines.Thisperformancereflectsanextremelyremotepotentialfailurerateoflessthan2.7x10-9failuresperflighthour.Insum,thereisampleevidencethatanalysisofthecompleteHPshaftsystemontheTrent1000modelsatissueachievestheleveloffidelityrequiredforfailuresofshaftsectionsunder§33.27(f).Therefore,thelevelofsafetyundertherequestedexemptionwillbeatleastequaltothatotherwiseprovidedby§33.27,therebyassuringthatnoadverseeffectonsafetywillresultfromagrantoftherequestedexemption.F.SummaryforFederalRegisterInaccordancewith§11.81(f),Rolls-RoyceoffersthefollowingsummarysuitableforpublicationintheFederalRegister.Rolls·RoycepicRegisteredoffice:65BuckinghamGate,LondonSW1ESATCompanynumber:1003142.RegisteredinEngland.Page3Rolls-RoycePetitioner:Rolls-RoycepicSectionof14C.F.R.Affected:14C.F.R.§33.27(f)(6)DescriptionofReliefSought:Rolls-Roycerequestsanexemptionfrom14C.F.R.§33.27(f)(6)tobeappliedtoRolls-RoyceTrent1000enginemodelsTrent1000-AE,Trent1000-CE,Trent1000-AE2andTrent1000-CE2.Rolls-RoyceseekstoexcludetheentireHPshaftsystemfromconsiderationindeterminingthehighestoverspeedthatwouldresultfromacompletelossofloadonaturbinerotor.G.AdditionalSupportingInformationEASACertificationrequirementsCS-E840andCS-E850aresimilarrequirementstothoseof§33.27.TheexistingTrent1000enginemodelshavebeenpreviouslycertifiedbyEASAunderTypeCertificateE.036.TomeettherequirementsofCS-E840andCS-E850,EASAgrantedanEquivalentSafetyFinding.TheevidenceprovidedtosupportthisEquivalentSafetyFindingwassimilartothatprovidedinthispetitionforexemption.TheEquivalentSafetyFindingwasacceptedbyEASAonAugust27,2013.H.PrivilegesofthisExemptionOutsidetheUnitedStatesPer14C.F.R.§11.81(h),Rolls-RoycerequeststhattheprivilegesofthisexemptionbeextendedoutsidetheUnitedStates.ThisextensionofprivilegesisnecessaryforoperationsbasedwithinforeigncountrieshavingbilateralagreementswiththeUnitedStatesacceptingFAA14C.F.R.Part33astheirairworthinessstandardsfortransportcategoryaircraft.TheTrent1000isintendedfortheglobalmarketplace,withcustomersbasedincountriesutilizingtheU.S.airworthinessstandards.I.GoodCauseexiststoissuetheExemptionwithoutNoticeorCommentPursuantto14C.F.R.§11.87,Rolls-RoycerequeststhatthispetitionbeprocessedwithoutpublicationintheFederalRegisterfornoticeandcomment,asmayotherwiseberequired.Rolls-Roycebelievesthatgoodcauseexiststonotdelaythisactionbecause:a.thereliefrequestediseffectivelyidenticaltoanEquivalentSafetyFindingpreviouslyacceptedbyEASAb.delayingtheactionwouldadverselyaffectRolls-RoycebecausetheTrent1000enginemodelscoveredbythispetitionarecurrentlyundergoingcross-validationwiththeFAA,thetimingofwhichisaimedatmeetingBoeingcontinuedin-servicedeliveryrequirementsoftheBoeing787-8and787-9,andsignificantdelaysinenginevalidationwouldimpacttheBoeingprogram;andc.thispetitionistimelyfiled.RebeccaPeacockAirworthinessSpecilistRolls-RoycepteDate;Friday,6111March2015Rolls-RoycepicRegisteredoffice:65BuckinghamGate,LondonSW1ESATCompany number:1003142.RegisteredInEngland.Page4