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 A.  The 12 variable bleed valves have 11 bleed valve and ballscrew actuators connected on either side of the master ballscrew actuator.
 B.  Each bleed valve and ballscrew actuator consists of a bevel gear speed reduction gearbox and a ballscrew unit linked to a hinged door. The translating nut is held during rotation by two pins which slide within two slots in the actuator body. The travel of this unit is transmitted to the door by two links. The driving gear of the speed reducer is used as a drive shaft to the other ballscrew actuators. A flexible shaft fits into a hex head drive in each end of the gear.
 C.  The ball bearing type screw and nut assembly consists of a screw, nut, ball return tube, a clamp attached by two screws and washers, and 68 balls.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
SEE B
FWD
A
S-M56-MM-00486
Bleed Valve and Master Ballscrew Actuator Location Figure 5 (Sheet 1)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
BALLSCREW
GEARBOX REDUCTION SPEED  BOOT PROTECTING  ACTUATOR 
A 
LEVER FEEDBACK POSITION DOOR 
A 
SHAFT SOCKET MAIN FLEXIBLE  SHAFT INPUT SEAL  SENSOR (MONITORING) FOR VBV POSITION ATTACHING BRACKET 
B  SHAFT SOCKET FLEXIBLE 
BALLSCREW  SEE  C 
SOCKET SHAFT FLEXIBLE 

SHAFT SOCKET FLEXIBLE  NUT TRANSLATING  SCREW BALL RETURN TUBE CLAMP 
A-A 
NUT 

BALL
C
Bleed Valve and Master Ballscrew Actuator Location Figure 5 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
SEE B (11 LOCATIONS)
FWD
A
Bleed Valve and Ballscrew Actuator Location Figure 6 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
A

SHAFT SOCKET
DOOR
A
SEAL
ATTACHING DOOR BOLT TO HINGE ENGINE
B
ATTACHING BOLT
SHAFT SOCKET
PROTECTING BOOT SEE C
ANGLE GEARBOX
SEAL
BALL RETURN  SCREW 
THRUST  TUBE 
BEARING  CLAMP 
TRANSLATING 
NUT 
ATTACHING 
BOLT  BALLSCREW  SHAFT  NUT 
SOCKET 

A-A
BALL
C
S-M56-MM-0929-(1)-00-B
Bleed Valve and Ballscrew Actuator Location
Figure 6 (Sheet 2)

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