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the output shaft of the starter. The reduction gears engage the
clutch as long as pneumatic power turns the turbine.
The starter output shaft turns the AGB. The AGB turns the
engine N2 rotor through shafts and other gears.
At approximately 55 percent N2, the start valve closes and
removes pneumatic power from the starter. The turbine and
reduction gears slow and the clutch disengages. The starter
output shaft then turns with the gearbox and engine. The turbine
and reduction gears continue to slow until they stop.
The starter receives a continuous flow of oil from the AGB when
the engine turns. The oil cools and lubricates the starter:
* Clutch
* Gears
* Bearings.
Oil returns to the AGB. A small quantity of oil stays in the
starter.
Training Information Point
It is not necessary to add oil to the starter after installation. But,
you must supply a new starter with a small quantity of oil. Refer
to chapter 12 of the airplane maintenance manual (AMM) part II
for oil quantity requirements and procedures.
After installation, the AGB maintains the starter oil level.
WARNING: DO NOT LET ENGINE OIL STAY ON YOUR SKIN.
FLUSH THE OIL FROM YOUR SKIN WITH WATER.
THE OIL IS POISONOUS.
ENGINE STARTING - STARTER
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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CAUTION: DO NOT HANG THE STARTER BY THE DRIVE
SHAFT. INTERNAL STARTER DAMAGE CAN
OCCUR.
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ENGINE STARTING - STARTER
ENGINE STARTING - STARTER
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THIS PAGE IS INTENTIONALLY LEFT BLANK
ENGINE STARTING - STARTER
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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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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
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