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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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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