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ENGINE STARTING - STARTER
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Starting Control
Electrical power for engine starting control comes from the
battery bus. The engine start switch and the DEUs control the
starting system.
Indication
The DEUs use input data to show engine parameters and start
valve position on the common display system (CDS).
These are the two modes of operation for the amber START
VALVE OPEN message:
* Steady
* Flash (crew alert).
The START VALVE OPEN message is steady when the start
valve is open and the start switch is in the ground position.
The START VALVE OPEN message flashes for 10 seconds then
shows steady when the start valve is open and the start switch
is not in the ground position.
Start Switch
These occur when you put the engine start switch to the GRD
position when electrical and pneumatic power are available:
* EEC receives an engine start signal
* APU electronic control unit receives a signal to open the APU
inlet guide vanes
* Start valve solenoid energizes and the valve opens
* Starter clutch engages and the engine N2 rotor turns
* Solenoid in the P5 panel energizes to hold the switch in the
GRD position.
Fuel and Ignition
You move the engine start lever to the idle position to add fuel
and ignition during the start.
See the engine fuel and control chapter for more information.
(CHAPTER 73) See the ignition chapter for more information.
(CHAPTER 74)
Starter Cutout
At 55 percent N2, this occurs:
* DEUs remove the electrical ground for the start switch
solenoid
* Engine start switch goes to the OFF position
* Start valve solenoid deenergizes and the valve closes.
ENGINE STARTING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Engine Wet Start
The EEC stops the engine start if the EGT does not increase in
15 seconds after you move the engine start lever to the idle
position. The EEC stops fuel flow and turns off ignition. You can
find a fault message on the control display unit (CDU). See the
TRAINING INFORMATION POINT page in this section for more
information.
Engine Hot Start
The EGT digital display flashes when the EEC finds there is a
possible hot start. If the EGT starting limit is exceeded, the EEC
stops fuel flow and ignition. The EGT digital display continues to
flash until you move the engine start lever to the cutoff position.
This system operates on the ground only.
NOTE: If you operate engines, you should know normal engine
starting parameters. You should also know the
maximum and minimum limits for each parameter.
You should stop a hot engine start before the EEC
does.
In-Flight Start
The crew puts the engine start switch to the FLT position for a
windmill start. A windmill start does not use the starter.
The crew uses the starter in flight if the airplane is out of
windmill start limits. See the flight operation manual for more
information about these limits. The CDS tells the crew that the
airplane is out of limits to windmill start the engine. The
message X-BLEED START shows above the N2 digital indicator.
For this condition, the flight crew uses the starter to start the
engine. The OPERATION page in this section shows this
message on the display.
Automatic Ignition
The EEC can automatically start ignition. See the engine ignition
chapter for more information. (CHAPTER 74)
ENGINE STARTING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ENGINE STARTING - FUNCTIONAL DESCRIPTION
ENGINE STARTING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
80-00-00-007
ENGINE STARTING - FUNCTIONAL DESCRIPTION
ENGINE STARTING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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