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The DEUs use the valve position switch to supply indication in
the flight compartment.
You use a 3/8 inch square drive tool to manually open the valve.
A visual indicator on the valve body shows valve position.
A small hole in the left fan cowl gives you access to the manual
override. A placard is near the hole.
Training Information Point
WARNING: REMOVE PNEUMATIC POWER FROM THE
AIRPLANE BEFORE YOU REMOVE THE START
VALVE. AIR PRESSURE IN THE PNEUMATIC
STARTER DUCT COULD CAUSE INJURY.
CAUTION: DO NOT OPERATE THE MANUAL DRIVE WITHOUT
PNEUMATIC POWER AVAILABLE. YOU MUST
SUPPLY PNEUMATIC POWER TO THE VALVE TO
PREVENT DAMAGE TO THE ACTUATOR
DIAPHRAGMS. IF YOU DO NOT OBEY
PRECAUTIONS, DAMAGE TO THE VALVE CAN
OCCUR.
ENGINE STARTING - START VALVE
EFFECTIVITY
GUN ALL 80-00-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
80-00-00-004
ENGINE STARTING - START VALVE
ENGINE STARTING - START VALVE
EFFECTIVITY
GUN ALL 80-00-00
Page 15
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
80-00-00-004
THIS PAGE IS INTENTIONALLY LEFT BLANK
ENGINE STARTING - START VALVE
80-00-00
Page 16
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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 starter turns the engine for engine starting or motoring
procedures. The starter changes air pressure into mechanical
energy.
Physical Description
The starter has a single-stage, axial-flow, turbine air motor. The
starter uses reduction gears and a sprag clutch to turn the
output shaft to the engine accessory gearbox (AGB).
The starter has one port for oil drain and fill. This port also has a
magnetic chip detector.
A coupling attaches the starter to the AGB. A coupling attaches
the lower pneumatic starter air duct assembly to the top of the
starter.
Functional Description
Pneumatic power goes through an open start valve to turn the
turbine air motor in the starter. The turbine turns the reduction
gears and engages the clutch. The clutch transmits torque to
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
GUN ALL 80-00-00
Page 17
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
80-00-00-005
CAUTION: DO NOT HANG THE STARTER BY THE DRIVE
SHAFT. INTERNAL STARTER DAMAGE CAN
OCCUR.
ENGINE STARTING - STARTER
EFFECTIVITY
GUN ALL 80-00-00
Page 18
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
80-00-00-005
ENGINE STARTING - STARTER
ENGINE STARTING - STARTER
EFFECTIVITY
GUN ALL 80-00-00
Page 19
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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