CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
PNEUMATIC STARTER
The pneumatic starter is connected to an air starter duct and converts the pressurized airflow from the aircraft air system into a high torque rotary movement.
This movement is transmitted to the engine High Pressure (HP) rotor, through the accessory drive system.
An internal centrifugal clutch automatically disconnects the starter from the engine shaft.
The pneumatic starter is secured on the aft right hand side of the AGB.
The pneumatic starter works with engine oil and has three ports :
-A filling port
-An overflow port
-A drain port.
The drain port features a plug made in two parts :
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An inner part, which is a magnetic plug used to trap any magnetic particles contaminating the oil.
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An outer part, which is the drain plug, receives the magnetic plug. This part has a check valve to prevent any oil spillage when the magnetic plug is removed for maintenance checks.
EFG
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CTC-201-162-01
EFFECTIVITY
80-11-10 Page 3
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
PNEUMATIC STARTER
The pneumatic starter has an air inlet and a stator housing assembly, which contains the following main elements :
- A turbine wheel stator and rotor.
-A gear set.
- A clutch assembly.
-An output shaft.
Pressurized air enters the air starter and reaches the turbine section, which transforms the air’s kinetic energy into mechanical power.
This high speed power output is transformed into low speed and high torque motion, through a reduction gear set.
A clutch system, installed between the gear set and the output shaft, ensures transmission of the turbine wheel power to the output shaft during engine starting, and disconnection when the output shaft speed reaches 50% of N2.
EFG
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CTC-201-164-00
EFFECTIVITY
80-11-10 Page 5
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
PNEUMATIC STARTER
The inlet housing assembly (1) ducts the flow of
compressed air to the stator assembly (2) which directs
the airflow to the turbine wheel blades (3).
This rotation produces high speed and low torque.
The turbine exhaust gasses are discharged through the
exhaust housing (4)and the exhaust screen (5).
The turbine shaft drives a pinion gear (6) which powers
three matched planetary gears (12). The planetary gears
drive an internal ring gear (11). In this device, the high
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