D. Operate the VBV System (Fig. 202)
S 012-030-C00
(1) Open the right fan cowl panel (AMM 71-11-02/201).
S 012-031-C00
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU OPEN THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(2)
Open the right thrust reverser half (AMM 78-31-00/201).
S 032-016-C00
(3)
Remove the fan duct panel at the 2:30 o'clock position
(AMM 72-33-03/401).
S 982-017-C00
(4)
Put the ratchet wrench into the drive shaft of the bleed valve and ballscrew actuator and engage it.
NOTE: Do this at the free end of one of the two halves of the VBV
____
linkage system.
S 982-018-C00
(5) Turn the shaft.
NOTE: Approximately 18 turns are necessary for the full system
____
travel.
S 982-019-C00
(6) Listen for a click when the system gets to the travel limit against the stop mechanism of the bleed valve.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
UPPER LINKAGE SYSTEM
SEE B
SEE A
B
FWD
LOWER
LINKAGE
SYSTEM
A
BLEED VALVE AND BALLSCREW ACTUATOR
DRIVE SHAFT
SEE C
BLEED VALVE
AND
BALLSCREW
ACTUATOR
DUAL PURPOSE RATCHET WRENCH C S-M56-MM-1026-(1)-01-B
Variable Bleed Valve (VBV) System Actuation - Manual Movement
Figure 202
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
S 982-020-C00
(7)
Disengage and remove the ratchet wrench.
S 432-021-C00
(8)
Install the fan duct panel (AMM 72-33-03/401).
S 412-032-C00
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU CLOSE THE THRUST REVERSER, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
(9)
Close the right thrust reverser half (AMM 78-31-00/201).
S 412-033-C00
(10)
Close the right fan cowl panels (AMM 71-11-02/201).
TASK 75-32-00-862-023-C00
4. VBV System Actuation Procedure - Engine Motoring
________________________________________________
A. References
(1)
AMM 71-00-00/201, Power Plant
(2)
AMM 71-11-02/201, Fan Cowl Panels
(3)
AMM 78-31-00/201, Thrust Reverser System
B. Access
(1)
Location Zones
506 Engine No. 1 - Fan Frame
606 Engine No. 2 - Fan Frame
(2)
Access Panels
5746L Engine No. 1 - Left Fan Cowl Panel
5846R Engine No. 2 - Left Fan Cowl Panel
C. Operate the VBV System (Fig. 203)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE C SEE A
SEE B
FILLISTER HEAD SCREW
RETAINER CLIP
VBV FEEDBACK CABLE
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