CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
STARTING SYSTEM

When the starter air valve is energized, it opens and air pressure is delivered to the pneumatic starter.
The pneumatic starter provides the necessary torque to drive the HP rotor, through the AGB, TGB and IGB.
The necessary air pressure for the starter comes from :
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The APU.

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The other engine, through the cross bleed system.

-A ground power unit (25 to 55 psi).

EFG
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CTC-201-161-01
EFFECTIVITY

80-00-00 Page 11
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG

THIS PAGE INTENTIONALLY LEFT BLANK

EFG

STARTER AIR VALVE

EFFECTIVITY

80-11-20 Page 1
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG

STARTER AIR VALVE
The Starter Air Valve (SAV) controls the pressurized air flow to the engine pneumatic starter.
The SAV is secured on the air starter duct, just below the 3 o’clock position and is accessible through an access door provided on the right hand side fan cowl.
The valve is connected to two air ducts. The upper duct (from the pylon to the valve), and the lower duct (from the valve to the air starter).
Two electrical connections transfer electrical signals to the ECU.

EFG

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CTC-201-166-01
EFFECTIVITY
80-11-20 Page 3
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
STARTER AIR VALVE
The SAV is normally closed.
An electrical signal, sent by the ECU, changes the valve status to the open position.
The valve can be manually operated in case of electrical command failure. The wrench button has to be pressed before moving the SAV handle and air pressure must be present, to avoid internal damage.
Gloves must be worn, to avoid injury from hot parts.
Position switches provide the valve status to the ECU.

EFG

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CTC-201-167-01
EFFECTIVITY
80-11-20 Page 5
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
STARTER AIR VALVE
The SAV has three main operations which are :
-Opening operation.
-Closing operation.
-Manual override operation.
Opening operation.
The valve is normally closed, and is opened by energizing either of the two solenoid coils.
　
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