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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The engine control system supplies most of the signals to
control the engine thrust. It also supplies signals to other
airplane systems that use engine control status.
The engine control system has these components:
* Thrust lever assemblies
* Thrust lever resolvers
* Engine start levers and switches
* Thrust lever interlock solenoids.
Abbreviations and Acronyms
* AGB - accessory gearbox
* AMM - aircraft maintenance manual
* ASM - autothrottle servomotor
* CDS/DEU - common display system/display electronics unit
* EEC - electronic engine control
* FDAU - flight data acquisition unit
* IDG - integrated drive generator
* HPSOV - high pressure shutoff valve
* RLA - reverse thrust lever angle
* TLA - thrust lever angle
* TO/GA - takeoff/go-around
* TRA - thrust lever resolver angle
* T/R - thrust reverser
ENGINE CONTROLS - INTRODUCTION
EFFECTIVITY
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D633A101-GUN Oct 10/2002
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ENGINE CONTROLS - INTRODUCTION
ENGINE CONTROLS - INTRODUCTION
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ENGINE CONTROLS - INTRODUCTION
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The engine control system supplies manual and automatic
control inputs to operate the engine. The engine control system
has these components:
* Thrust levers (forward and reverse)
* Thrust lever resolvers
* Engine start levers and switches
* Thrust lever interlock solenoids.
Thrust Levers
You use the thrust levers to supply the manual inputs to the
engine control system. There are two thrust lever assemblies,
one for each engine. For each engine, there is a forward thrust
lever and a reverse thrust lever. The reverse thrust lever is on
the forward thrust lever.
For each engine, the thrust levers supply a thrust command
signal to the electronic engine control (EEC) through the thrust
lever resolver. Each thrust lever assembly connects
mechanically to the resolver through an adjustable rod.
An interlock latch prevents the operation of the forward thrust
lever and the reverse thrust lever at the same time.
Thrust Lever Resolver
There are two thrust lever resolver assemblies, one for each
engine. Each thrust lever resolver assembly has two resolvers,
one for EEC channel A and one for EEC channel B. The thrust
lever resolvers change the mechanical forward and reverse
thrust lever positions to analog thrust lever resolver angle
(TRA) signals. These signals go to the EEC. The EEC uses these
signals to control the engine.
See the Engine Fuel and Control section for more information
on EEC engine control. (SECTION 73-21)
Start Levers
There are two start levers, one for each engine. You use the
engine start lever during an engine start. You also use it to
shutdown the engine. The start levers operate switches which
supply signals to different aircraft and engine systems and
components.
ENGINE CONTROLS - GENERAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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Reverse Thrust Interlock Solenoids
There are two reverse thrust interlock solenoids, one for each
engine. Each reverse thrust interlock solenoid limits the range
of motion of a reverse thrust lever. You can make the thrust
reverser deploy, but you can not increase the reverse thrust
until the thrust reverser sleeves are near the full deployed
position. The EEC operates the solenoids. The thrust lever
interlock solenoids are in the autothrottle assembly. You must
lower the autothrottle assembly to access the thrust lever
interlock solenoids.
See the thrust reverser section for more information.
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