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The engine start switches and the ignition selector switch are
on the P5 forward overhead panel.
The upper center display unit is on the P2 main panel center.
The engine parameters usually show on this display. The
parameters can also show on the lower center display unit.
The engine start levers are on the control stand, aft of the thrust
levers.
Electrical Equipment Compartment
The display electronics units (DEU)s are on the E3 rack.
ENGINE STARTING - COMPONENT LOCATIONS - FLIGHT COMPARTMENT AND EE COMPARTMENT
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ENGINE STARTING - COMPONENT LOCATIONS - FLIGHT COMPARTMENT AND EE COMPARTMENT
ENGINE STARTING - COMPONENT LOCATIONS - FLIGHT COMPARTMENT AND EE COMPARTMENT
EFFECTIVITY
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80-00-00-003
Purpose
The start valve controls pneumatic power to the starter. The
valve opens for these engine operations:
* Ground start
* In flight starts which require starter assist
* Motoring.
Physical Description
The valve is a butterfly shutoff valve. It is electrically controlled
and pneumatically operated. The valve is spring-loaded closed.
The primary components are the valve body assembly and the
actuator assembly.
The valve body assembly has these components:
* Butterfly valve
* Valve shaft
* Shaft bearings
* External position indicator.
The actuator assembly has these components:
* Torsion spring
* Pneumatic actuator
* Solenoid valve assembly
* Valve position switch
* Manual override provision.
Functional Description
The valve solenoid energizes when you put the engine start
switch to the GRD position. This permits air pressure to the
pneumatic actuator. The pneumatic actuator force is more than
the torsion spring force and the start valve opens.
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
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ENGINE STARTING - START VALVE
ENGINE STARTING - START VALVE
EFFECTIVITY
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80-00-00-004
THIS PAGE IS INTENTIONALLY LEFT BLANK
ENGINE STARTING - START VALVE
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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
　
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