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CHAPTER 78
Engine Exhaust
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The engine exhaust system controls the direction of the engine
exhaust gases.
The engine exhaust system has these sub-systems:
* Turbine exhaust
* Thrust reverser (T/R).
Abbreviations and Acronyms
* A/T - autothrottle
* CDS - common display system
* CDU - control display unit
* DCV - directional control valve
* DEU - display electronics unit
* EAU - engine accessory unit
* EEC - electronic engine control
* ELEC - electrical
* ENG - engine
* FCC - flight control computer
* GND - ground
* HIV - hydraulic isolation valve
* INBD - inboard
* ind - indication
* ISV - isolation valve
* LVDT - linear variable differential transformer
* P - panel
* prox - proximity
* REF - reference
* RLY - relay
* RTO - rejected take off
* S - seconds
* seq - sequence
* SL - sync lock
* stby - standby
* SW - switch
* sync - synchronizing
* sys - system
* T/R - thrust reverser
ENGINE EXHAUST SYSTEM - INTRODUCTION
EFFECTIVITY
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ENGINE EXHAUST SYSTEM - INTRODUCTION
ENGINE EXHAUST SYSTEM - INTRODUCTION
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General
The engine exhaust system controls the direction of the turbine
exhaust gases and the fan air exhaust gases.
Turbine Exhaust System
The turbine exhaust system supplies an exit for the engine
exhaust gases. This exit increases the velocity of the exhaust
gases. This increases engine thrust.
The major components of the turbine exhaust system are the
exhaust nozzle and the exhaust plug.
Thrust Reverser System
The thrust reverser (T/R) system changes the direction of the
fan air exhaust to help create reverse thrust. The flight crew
uses reverse thrust to slow the airplane after landing or during
a rejected takeoff (RTO). The turbine exhaust airflow direction
does not change during reverse thrust. The T/R system has a
electro-hydraulic control system and an indicating system.
The T/R system has two thrust reversers. T/R 1 is the thrust
reverser for engine 1 (left). T/R 2 is the thrust reverser for
engine 2 (right).
Each T/R has a left and right half. Each half has a translating
sleeve which moves aft (deploy position) for reverse thrust. The
two sleeves work independently from each other. Fan air
exhaust goes out radially and forward when the translating
sleeves are in the deploy position.
Four hinges attach each T/R half to the strut. You must
deactivate the thrust reverser before you open a T/R half.
Latches are at the bottom of the two halves. The latches keep
the two halves together.
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The turbine exhaust system supplies an exit for the turbine
exhaust gases. The system increases the turbine exhaust gas
velocity to increase engine thrust.
TURBINE EXHAUST SYSTEM - INTRODUCTION
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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