A location is provided on its aft end for installation of a position sensor.
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CTC-201-146-02
EFFECTIVITY
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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
VARIABLE BLEED VALVE
Master bleed valve.
The master bleed valve and ballscrew actuator assembly is the unit which transmits the driving input from the gear motor to the 11 remaining variable bleed valves.
It is located between struts 10 and 11 in the fan frame mid-box structure.
Its main components are:
-A speed reduction gearbox.
- A ballscrew actuator, linked to a hinged door.
Speed is reduced through 1 pair of spur gears and by 2 pairs of bevel gears. The bevel gears drive the ballscrew.
Axial displacement of the ballscrew’s translating nut is transmitted to the door by 2 links.
A lever, integral with the hinged door, is connected to a feedback rod which transmits the angular position of the door to a sensor (RVDT).
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CTC-201-147-01
EFFECTIVITY
75-31-00 Page 9
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
VARIABLE BLEED VALVE
Variable Bleed valves.
The 11 variable bleed valves are located in the fan frame mid-box structure in between the fan frame struts.
They feature the same internal design as the master ballscrew assembly, but have only one reduction gear instead of two.
They operate in synchronization with the master ballscrew actuator, which provides the input through a flexible drive shaft linkage.
Main drive shaft.
The main drive shaft is a flexible and unshielded power core which has a hexagonal fitting on one end and a splined end fitting on the other.
A spring is attached to the splined end, to hold the shaft assembly in position during operation, and also help removal and installation of the shaft.
It is installed between the gear rotor, which drives it, and the master bleed valve.
Flexible shafts.
The flexible shafts are installed between the variable bleed valves and are unshielded power cores, which have a hexagonal fitting on one end and a double square fitting on the other.
A spring is attached to the hexagonal end, to hold the shaft assembly in position during operation, and also help shaft removal and installation.
Ferrules are installed in the struts of the engine fan frame to guide and support the flexible shafts during operation.
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