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MaintenanceTrainingCenter
B787ME&AVTypeITrainingManual
B787
TechnicalTrainingManualMaintenanceCourseME&AVI（GEnx）
LevelI&II–ATA78EngineExhaustSystems
THISMANUALISFORTRAININGPURPOSESONLY.
NOMAINTENANCEACTIONSHOULDBETAKENASARESULTOFINFORMATIONCONTAINEDINTHISNOTEBOOK.
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ATA78EngineExhaustSystems
Description
Thislessonprovidesinformationoncomponents,interfacesandoperationoftheenginenozzleandthrustreversersystems.T
Objectives
Statethepurposeofthesystem.
Identifythemajorsystemcomponentsofthesystem.Statethepurposeofthemajorsystemcomponents.Statethegenerallocationofmajorsystemcomponents.
Describethemajorsysteminterfacesandbeabletoexplainthenormalsystemfunction.
Differentiatebetweenthemaintenanceanddispatchdeactivationproceduresforthethrustreversersystem.
Statetheprecautionsrelatedtoextendingandretractingthethrustreverser.
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ATA78-00EngineExhaustSystems
(I)
GeneralDescription–Introduction
Purpose
Theengineexhaustsystemcontrolsthedirectionoftheengineexhaustgasestoprovideforwardandreversethrust.
Theengineexhaustsystemhasthesesubsystems:
Turbineexhaust(ATA78-11)
Thrustreversers(ATA78-31)
Thrustreverseractuationandcontrol(ATA78-34)
Thrustreverserindicatingandfaultdetection(ATA78-36).
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ATA78-11TurbineExhaust（I）
GeneralDescription–Introduction
Purpose
Theturbineexhaustsystemmakesanexitductfortheturbineexhaust.
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ATA78-11TurbineExhaust（I）
Theturbineexhaustsystemhasthesecomponents:
Nozzle
Forwardcenterbody
Aftcenterbody
Centerventtube.
GeneralDescription-ExhaustSystem
Theturbineexhaustsystemisanexitductfortheturbineexhaustgases.
Duringnormalengineoperationwiththethrustreverserstowed,theexhaustgasiscontainedandgoesoverboardthroughtheexhaustcomponents.
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ATA78-10TurbineExhaust（II）
Location
Theexhaustsystemcomponentsareaftoftheturbinerearframe.Theexhastnozzleattachestotheaftsideoftheturbinerearframe.Theforwardcenterbodyattachestothenozzle.
Theaftcenterbodyattachestotheforwardcenterbody.
Thecenterventtubeattachestothesumpcoverflangeontheaftsideturbinerearframe.
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ATA78-31ThrustReverserSystem（I）
GeneralDescription–Introduction
Purpose
Thethrustreverser(T/R)systemcontrolsthedirectionofthefanairexhausttomakeforwardorreversethrust.
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ATA78-31ThrustReverserSystem（I）
thrustreverseractuationsystem(TRAS).Thethrustreversersareforgrounduseonly.
-Therearecontrolsystemfeaturestopreventdeploymentinflight.
Thethrustreversersarenotintendedforuseinbackingtheairplane.
GeneralDescription-ThrustReverser
Thethrustreverser(T/R)systemcontrolsthedirectionofthefanairexhausttomakeforwardorreversethrust.
Thethrustreverser(T/R)systemhasaleftandrighthalfthathingestotheenginestrut.
WhentheT/Rtranslatingsleevesareintheforward(stowed)position,theLPcompressoroutletair(fanair)goesthroughthebypassductandoutattherearofthefanduct.
WhentheT/Rsleevesmovetotheaft(deployed)position,draglinksattachedtotheblockerdoorsmovetheblockerdoorsintothebypassduct.
Thismakestheairflowgothroughthecascadesegments
Segmentsareuncoveredbytheaftmovementofthetranslatingsleeves.
Thecascadesegmentsturnthefanairinaforwarddirectiontoproducereversethrust.
StudentNotes
Thethrustreverserhalvesweigh1610lbs.(600.9kg)each.
Specialgroundequipmentfixturesareusedtoremoveandreplace.Thetranslatingsleevesaredeployedandstowedbythehydraulic
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ATA78-31ThrustReverserSystem（II）
16cascadesegments
Turnthefanairforwardwhentheblockerdoorsareinthecorrectposition.
YoucanopentheT/Rwith
ThePDOShydraulicsystem
Anexternalsourcewithahydraulichandpump.
EachT/Rhalfattachesby2fixedand3floatinghingesonthetopofthepylon.
TenlatchesholdtheT/Rhalvestogether.
TrustReverser
Thethrustreverser(T/R)assemblyhas2halves(alsocalledC-ductsbecauseoftheirshape).
-TheLPcompressoroutletair(fanair)flowsthroughtheT/Rtoproducethemajorityoftheforwardthrust.
Thereverserismadefromaluminiumandcompositematerials.
TheT/Rshaveafanductinnerwall-providesprotectionforenginecore
the
TranslatingsleevesontheoutersectionoftheT/RmoveaftwhentheT/Roperates
Movesblockerdoorsintoposition
Changethefanairflowoutwards
Exposethecascadesegments
4T/Rhydraulicactuators(2perT/Rhalf)operatethetranslatingsleeves
Theirmovementissynchronizedbyaflexshaftthatrunsoverthetopbetweenthe2T/Rhalves.
-12draglinksconnecttothetranslatingsleeves
Pullthe12blockerdoorsintothecorrectpositioninsidetheT/R
Preventsfanairfromgoingaftwhenthetranslatingsleeveextends.
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ATA78-31ThrustReverserSystem（II）
Openthe2translatingsleevelatches.
LatchSystem
The2T/Rcowls(C-ducts)handle.
Latchbeamlatches(4)
V-bladelatch
Bumperlatches(2)
Sleevelatches(3)
Attheaftlatch,pushonthesecondarylocktoopenthespring-loadedlatchhandle.
Pullthehandletothefullopenpositiontoreleasethehookfromthekeeper.
Dothesameprocedurefortheforwardlatch.
StudentNotes
are
held
together
by
10
latches
and
1
Bifurcationlatchsystem(BLS)handle
TheBLShandleconnectswith2bumpercatchesthroughpush-pull(teleflex)cables
SecurestheinnersectionoftheT/RcowltothecoreoftheengineandtheoppositeT/Rcowl.
AlwaysopentheBLSlatchfirst.
TurntheBLSlatchhandleclockwiseuntilitcomestoastop.
Pullthehandledownuntilitcomestoastop.
Turnthehandlecounter-clockwiseuntilitcomestoastop.Next,openthetensionlatchNo.1(C-ductlatchNo.1)handle.
Pushupthesecondarylocktoreleasethelatchhandle.
Turnthelatchhandledownandinboard.
Pushdownthesecondarylocktounlockthelatch.
TensionlatchNo.1(ref.TP4)isanorangeVbladelatchhandleonthelefttorquebox.
handle
behind
the
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ATA78-31ThrustReverserSystem（II）
LatchSequence
Thelatchesareidentifiedandopenedinthissequence:
-(B)Thesinglebifurcationlatchsystem(BLS)latch(connectscoreoftheT/Rtotheengine)
doneorwhentheT/Rislocked-outfordispatch
the
(C)The2translatingsleevelatches(connecttheleftandrighttranslatingsleevestogether)
opentheaftlatchfirst,thentheforwardone.
(D)The3corecowllatches(holdthecoresoftheT/Rhalvestogether)-opentheleftlatchfirst,thentheright,thenthecorecowllatch(atthe6:00position).
(E)TheexternaltensionlatchNo.4(C-ductlatchNo.4)(holdstheT/Rhalvestogether)
(F)TheinternaltensionlatchesNo.2and3(C-ductlatchesNo.3and4)(holdtheT/Rhalvestogether),openlatch3first,thenlatch2.
(G)TheV-bladelatch(holdstheT/Rhalvestogether).
StudentNotes
Apanelatthe6:00positiongivesaccesstothenumber2and3sleevelatches.
Thepanelisalsoapressurereliefdoor.Theinsideofthepanelhastheinhibitpins.
-
Thepinsstopthesleevesfrommovingwhenmaintenanceis
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ATA78-31ThrustReverserSystem（II）
-
Thecowlsareveryheavy.
Hold-OpenRod
TheT/Rhold-openrodskeepthethrustreversercowlsopenformaintenance.
Theyarealsoasafetydevice.
PreventinjurytopersonsatworkontheengineortheT/Rcowl.
WARNING
Youmustputthehold-openrodinplacebeforeyoudoworkunderthecowl.
EachT/Rcowlhas1hold-openrod.Toinstalltherod:
Completelyremoveitfromtheupperandlowerreleasecollars.
Attachtheupperendoftherodtoabracketbelowthelowerreleasecollar.
Attachthelowerendtoafittingontheenginecore.
Thehold-openrodsarestowedontheforwardinnersurfaceoftheT/Rtorquebox.
StudentNotes
MakesuretheT/Rhold-openrodsaresecuredinplacebeforeyougounderthecowl.
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T/RActuationAndControl
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ATA78-34T/RActuationAndControl（I）
GeneralDescription–Introduction
Purpose
Thethrustreverseractuationsystem(TRAS)supplieshydraulic
powertoextendsleeves
or
retract
the
thrust
reverser
(T/R)
translating
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ATA78-34T/RActuationAndControl（I）
distributionunits(RPDU)controlvalvesinthehydrauliccontrolunit(HCU)andatracklockmechanismtosupplyhydraulicpressuretooperatetheT/Rs.
StudentNotes
TherightengineT/Rgetshydraulicpressurefromtherighthydraulicsystem.
TheleftengineT/Rgetshydraulicpressurefromthelefthydraulicsystem.
TheRPDUsthatprovideT/RcontrolareintheFWDEEBayandreceivepowerfromtheP300andP400panelelectricalbuses.
GeneralDescription–TRAS
Thethrustreverseractuationsystem(TRAS)supplieshydraulicpowertodeployandstowthethrustreversertranslatingsleeves.
-Itoperatesonlyonthe(normal).
TheTRASconsistsof:
ground,
with
the
engine
fire
handle
IN
Thrustreverserhydrauliccontrolunit(HCU)
Thrustreversertracklockmechanism.
ThrustreverserT-Piece
4thrustreverserhydraulicactuators
Thrustreverserfeedbackunit
Thrustreversersyncshaftandtubing
Thrustreversermanualdriveunit
Thrustreversertestenableswitch.
Thereversethrustleversstartandcontrolthesystemoperation.
Thethrustcontrolmodule(TCM)suppliesT/Rcontrolsignalstothe
Electronicenginecontrol(EEC)
CDN
CCRcabinetshavethrustreverserhostedsoftware.
Whenthethrustreversers(T/R)operate,theEECandremotepower
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ATA78-34T/RActuationAndControl（II）
-Performanceadjustmentsareapplied.
IsolationValveDeactivation
YoucandeactivatetheT/Rfordispatchorforsafetyofgroundmaintenance.
AlwaysfollowAMMsafety/preparationprocedures.Procedure:
Openthehydrauliccontrolunit(HCU)accesspanel.
PuttheHCUinhibitleverintheinhibitpositionandinstallthelockpin.
InstallT/Rsleevelock-outpins(2)ineachtranslatingsleeve(loweraftarea).
Pinsarestowedinlatchaccessdoor.
DeactivatetheT/Rsystemincircuitbreakerindicationandcontrol(CBIC).
Placardairplaneanddocumentaircraftrecords,asnecessary.
StudentNotes
TheBoeingMMELpermitsdispatchwiththethrustreverserinoperativewiththeseconditions:
Theinoperativereverserissecuredandlockedintheforwardthrustposition
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ATA78-36Thrustreverserproximitysensors（I）
GeneralDescription–Introduction
Purpose
Thethrustreverser(T/R)proximitysensorssupplydataforthesefunctions:
-Extendandretractcontrol
-Systempressurizationstatus
-Flightdeckindication
-Faultdetection
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ATA78-36Thrustreverserproximitysensors（I）
TheRPDUssupplythepower.
GeneralDescription-T/RIndications
Thethrustreverser(T/R)indicationandfaultdetectionmonitorsthethrustreverseractuationsystem(TRAS).
Thesystemsupplies:
Actuatorposition
Actuatorlockstatus
Tracklock(TL)status
-TheEECsuppliesthecontrol.
StudentNotes
The2upperactuatorshaveLVDTstogiveactuatorpositiontotheEEC.
Thereare6proximitysensorsforeachthrustreverser:
system
OneontheHCU
OneontheT/L
Oneoneachofthe4lockingactuators.
Hydrauliccontrolunit(HCU)isolationvalve(IV)pressurestatus.Themainenginedataconcentrator(MEDC)getslockstatusfrom:
Lockingactuatorproximitysensors
TLproximitysensor.
EachT/Rhalfhasalinearvariabledifferentialtransformer(LVDT).Whenthereversethrustleverispulledtotheupposition:
Thetranslatingsleevesmoveto40%deploy
TheamberREVshowsonEICAS
Thethrustreverserinterlocksolenoidisenergizedandreleasedtopermitreversethrust
TheLVDTsgivethepositionfeedbacktotheEEC.
TheEECandtheCDNreceiveandusethedataforcontrol,faultmonitor,anddisplay.
Themainenginedataconcentrator(MEDC)providestheexcitationtothe
proximitysensorcoilsandreadsthecoilinductancefeedback.
-
3oftheproximitysensorsgotochannelAoftheMEDCand3proximity
sensorsgotochannelB.
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ATA78-36Thrustreverserproxim
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