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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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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
GUN 201-999 80-00-00
Page 9
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
General
The engine starting system has these components on the left
side of the engine:
* Pneumatic starter ducts
* Start valve
* Starter.
You open the left fan cowl to get access to these components.
The electronic engine control (EEC) is on the right side of the
engine fan case at the 2:00 position, aft looking forward (ALF).
You open the right fan cowl to get access to the EEC.
Pneumatic Starter Ducts
There are two pneumatic starter duct assemblies.
The upper assembly has two tubes and two flexible joints. One
end connects to a pneumatic duct at the strut. The other end
attaches to the start valve. The assembly attaches to the fan
case.
The lower assembly has one tube. The assembly connects to
the start valve and to the starter. The assembly attaches to the
fan case.
Start Valve
The start valve is above the starter on the fan case.
Starter
The starter is on the forward face of the engine accessory
gearbox (AGB) at the 8:00 position.
ENGINE STARTING - COMPONENT LOCATIONS - ENGINE
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
80-00-00-002
ENGINE STARTING - COMPONENT LOCATIONS - ENGINE
ENGINE STARTING - COMPONENT LOCATIONS - ENGINE
EFFECTIVITY
GUN ALL 80-00-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
80-00-00-002
Flight Compartment
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
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
80-00-00-003
ENGINE STARTING - COMPONENT LOCATIONS - FLIGHT COMPARTMENT AND EE COMPARTMENT
ENGINE STARTING - COMPONENT LOCATIONS - FLIGHT COMPARTMENT AND EE COMPARTMENT
EFFECTIVITY
GUN ALL 80-00-00
Page 13
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
80-00-00-003
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.
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