A757MAINTENANCEMANUAL////////////////////////////////////////////////////PW2000SERIESENGINESENGINEMOUNTS-DESCRIPTIONANDOPERATION1.GeneralA.Theforwardandaftlowerenginemountsholdtheengineandareattachedatsixlocations.Theforwardenginemountisattachedtotherearflangeoftheintermediatecaseatthreelocations.Theaftenginemountisattachedtothedoubleflangeonthetopoftheturbineexhaustcaseandatpointsapproximately35degreesonthesideofthecenterline.Thelowerenginemountsaremadetoremovetheforceoftheenginethrustandtheverticalandsideloads.Thelowerenginemountscanbecomelargerintheaxialandradialdirectionswhenthetemperatureincreases.2.ComponentDetails(Fig.1)A.ForwardLowerEngineMount(1)Theforwardlowerenginemountholdstheengineatthreelocations:ashear-pinfittingandtwothrustlinks.Theshearpinisinstalledintoamatingholeintherearflangeoftheintermediatecaseandheldbyfourbolts.Thetwothrustlinksareattachedtotherearflangeoftheintermediatecaseononesideoftheshearpinfittingandtotheaftendofthemountassembly.Theforwardlowerenginemountattachestothestrutwithfourverticaltensionbolts.B.AftLowerEngineMounts(1)Theaftlowerenginemountholdstheengineatthreepointsonthedoubleflangeoftheturbineexhaustcase.Theaftlowerenginemountincludestwotangentiallinksandacenterlinkwhichattachestothesamemountfitting.Themountfittingattachestothestrutwithfourverticaltensionbolts.A757MAINTENANCEMANUAL////////////////////////////////////////////////////PW2000SERIESENGINESENGINEMOUNT-MAINTENANCEPRACTICES1.GeneralA.Thisprocedurehastwotasks,inspecttheinnerboltsoftheenginethrustlinkclevismountandretouqueboththeinnerandoutterboltsifanyareloose.B.Access(1)LocationZones410LeftEngineNacelle420RightEngineNacelleC.Procedure:(1)Examinetheinnerboltsoftheenginethrustlinkclevismount.(a)Boltswithtamper-proofputty:Ifthetamper-proofputtyontheboltheadandputtyontheclevismountarenotalignedthisindicatespossibleboltmovementorlooseningandisnotacceptable.(b)Iflooseningisincicatedretorqueboththeinnerandouterclevismountbolts(AMM71-21-00/201).(c)Boltswithouttamper-proofputty:Useaninspectionmerrorandlightsourcetovisuallyinspectboltsandwashersforvisiblelooseness.(d)Iflooseningisindicatedretorqueboththeinnerandouterclevismountbolts(AMM71-21-00/201).TASK71-21-00-422-038-P002.ThrustLinkClevisMountBoltsRetorque-SpecialProcedure_A.General(1)Thistaskisrequiredafteranyevidenceisseenoflooseningoftheenginethrustlinkclevismountbolts.B.Access(1)LocationZones410LeftEngineNacelle420RightEngineNacelleC.ProcedureS022-016-P00(1)Retorquetheboltswhichattachtheenginethrustlinkclevismountatthelocationclosesttothefanexitcaseto190-215in-lbs(21.47-24.29Nm).(a)Continuetotorquethe4boltsinarepeatedpatternuntilnolossoftorqueoccurs.EFFECTIVITY_______________________________OeA757MAINTENANCEMANUAL////////////////////////////////////////////////////PW2000SERIESENGINESENGINEMOUNT-MAINTENANCEPRACTICES1.GeneralA.Thisprocedurehastwotasks,inspecttheinnerboltsoftheenginethrustlinkclevismountandretouqueboththeinnerandoutterboltsifanyareloose.B.Access(1)LocationZones410LeftEngineNacelle420RightEngineNacelleC.Procedure:(1)Examinetheinnerboltsoftheenginethrustlinkclevismount.(a)Boltswithtamper-proofputty:Ifthetamper-proofputtyontheboltheadandputtyontheclevismountarenotalignedthisindicatespossibleboltmovementorlooseningandisnotacceptable.(b)Iflooseningisincicatedretorqueboththeinnerandouterclevismountbolts(AMM71-21-00/20...
