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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The engine starting system uses pneumatic power to turn the
engine’s N2 rotor during a start or motor procedure. Pneumatic
power comes from one of these sources:
* APU
* Pneumatic ground equipment
* Opposite engine.
These components control the engine start system:
* Flight compartment switches
* Display electronics unit (DEU)
* Electronic engine control (EEC).
The engine starting system operates on the ground and in flight.
Abbreviations & Acronyms
* AGB - engine accessory gearbox
* ALF - aft looking forward
* AMM - airplane maintenance manual
* CDS - common display system
* CDU - control display unit
* DEU - display electronics unit
* EEC - electronic engine control
* FMCS - flight management computer system
ENGINE STARTING - INTRODUCTION
EFFECTIVITY
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ENGINE STARTING - INTRODUCTION
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ENGINE STARTING - INTRODUCTION
EFFECTIVITY
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80-00-00-000
General
The engine starting system uses these airplane and engine
systems or components:
* Pneumatic power
* Electrical power
* Flight compartment switches
* Engine fuel control system
* Engine control system.
* Common display system (CDS).
Engine Start Switch
You put the engine start switch to the GRD position to turn the
engine with the starter. The switch automatically moves to the
OFF position at starter cutout.
When electrical and pneumatic power is available, this happens
when you put the switch to the GRD position:
* Electronic engine control (EEC) receives a start signal
* APU receives an engine start signal
* Start valve opens and the pneumatic starter turns the
engine.
The crew uses the FLT position to start the engine in flight when
the starter is not necessary.
The CONT position supplies continuous ignition.
See the engine ignition chapter for more information on the
ignition system. (CHAPTER 74)
Start Valve and Starter
The start valve opens to supply power to the starter. Usually,
this valve opens when you put the engine start switch to the
GRD position. The start valve position shows on the engine
display. You can manually open the valve.
The starter turns the engine N2 rotor through the engine
accessory gearbox (AGB).
EEC
The EEC protects the engine during start. The EEC shuts off fuel
supply to the engine when it finds the engine parameters are
out of limits during a start.
Display Electronics Units (DEUs)
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The DEUs are components of the common display system
(CDS). The DEUs monitor N2 and let the engine start switch go
back to the OFF position at starter cutout.
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The DEUs are components of the common display system
(CDS). The DEUs monitor N2 and let the engine start switch go
back to the AUTO position at starter cutout. A signal goes to the
EEC by the DEU to let the EEC use its automatic ignition feature.
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ENGINE STARTING - GENERAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
80-00-00-001
ENGINE STARTING - GENERAL DESCRIPTION
ENGINE STARTING - GENERAL DESCRIPTION
EFFECTIVITY
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