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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
6.  Main Flexible Shaft (Fig. 7)
___________________
 A.  The main flexible shaft is an unshielded power core which has a hexagon fitting on one end and a splined end fitting on the other. A spring is attached to the splined end. The spring holds the shaft in position during operation and also permits easy removal of the shaft.
 7.  Flexible Shafts (Fig. 7)
_______________
 A.  Each shaft is an unshielded power core which has a hexagon fitting on one end and an 8-point fitting on the other end. A spring is attached to the hexagon end. The spring holds the shaft assembly in position during operation and also permits easy removal of the shaft assembly. The ferrules that are installed in the struts of the engine fan frame, are designed to support the flexible shaft assemblies during operation.
 8.  Variable Bleed Valve Feedback Cable (Fig. 7)
___________________________________
 A.  The VBV feedback cable transfers the position of the feedback lever to the MEC allowing constant monitoring of the angular position of the VBV doors.
 9.  Operation (Fig. 8)
_________
 A.  The variable bleed valve system performs four primary functions:
 (1)  
Positions the bleed valves in response to a differential fuel pressure through the fuel gear motor.

 (2)  
Mechanically synchronizes the bleed valves throughout the stroke.

 (3)  
Limits the bleed valve position at the end of each stroke.

 (4)  
Provides feedback of the bleed valve position.

 B.  The fuel gear motor is hydraulically activated by pressurized fuel. The MEC determines the direction and speed of motor rotation. The gear motor drives the rotary shaft which drives the gear reduction stage of the master ballscrew actuator through the stop mechanism.
 C.  The flexible shafts transmit power from the rotary shaft to the remaining ballscrew actuators. The flexible shafts are supported by ferrules at their mid-points. The ballscrew actuators reduce shaft speed with bevel-cut gears and convert rotary motion to linear output.
 D.  The actuator output is from a trunnion mount provided on the translating ball nut. The mount is connected to the bleed valve by a tandem linkage to provide a rotational movement on the bleed valve pivotal axis. The direction of the bleed valve rotation is controlled by the fuel gear motor.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
SEE B
SEE D
SEE C
FWD
A
Main Flexible Shaft, Flexible Shafts, and VBV Feedback Cable Location
Figure 7 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SPRING
SHAFT
SHAFT
SPRING
MAIN FLEXIBLE SHAFT
C
FLEXIBLE SHAFT
B
FEEDBACK
REVERSER ARM
CONNECTION

MEC CONNECTION
6 O'CLOCK STRUT BRACKET MOUNT
VBV FEEDBACK CABLE
D
S-M56-MM-0370-(1)-01-B
Main Flexible Shaft, Flexible Shafts, and VBV Feedback Cable Location
Figure 7 (Sheet 2)

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////

BALLSCREW ACTUATOR (11 UNITS)
　
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