75-32-03
ALL ú ú C01 Page 403 ú Jul 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
S 034-025-C00
CAUTION: DO A CHECK THAT THE VALVE DOORS ARE ALMOST CLOSED.
_______
(4) Disengage and remove the flexible shafts from each side of the master ballscrew actuator.
NOTE: To do this, compress the spring hexagonal end of the flexible
____ shaft at the end away from the actuator (upper shaft) and at the actuator end (lower shaft). You must also disengage the 8-point fitting at the opposite end.
S 034-026-C00
(5) Disconnect the feedback rod of the variable bleed valve (VBV) from the feedback lever for door position as follows:
(a)
Remove and discard the cotter pin.
(b)
Remove the slotted nut.
(c)
Remove the washer.
(d)
Remove the bolt and disengage the clevis from the feedback lever.
S 034-027-C00
(6)
Remove the two screws that attach the bleed valve and master ballscrew actuator to the 9 o'clock strut.
S 034-028-C00
(7)
Loosen the four primary captive bolts that attach the bleed valve and master ballscrew actuator to the fan frame.
S 034-029-C00
CAUTION: DO NOT CAUSE DAMAGE TO THE BOOT ON THE STOP MECHANISM WHILE YOU
_______ COMPRESS THE MAIN FLEXIBLE SHAFT.
(8) Use a hexagonal (Allen) wrench, 5/64 inch across the flats, to disengage the hexagonal end of the main flexible shaft.
NOTE: To do this, push it into the stop mechanism of the bleed
____
valve and the fuel gear motor.
S 024-030-C00
(9) Remove the bleed valve and master ballscrew actuator from the engine.
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75-32-03
ALL ú ú C01 Page 404 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
TASK 75-32-03-404-031-C00
3. Install the Bleed Valve and Master Ballscrew Actuator
_____________________________________________________
A. Equipment
(1)
856A2501, Wrench - Dual Purpose Ratchet for VBV Manual Actuation, CFM International, P.O. Box 15514, Cincinnati, OH 45215
(2)
856A3368, Yoke - VBV Doors Setting, CFM International
(3)
856A3408, Gage - Setting Yoke Master for the VBV Door, CFM International
B. Consumable Materials
(1) Grease - Graphite (CP2101) (AMM 70-10-01/201)
C. References
(1)
AMM 70-10-01/201, Consumable Materials
(2)
AMM 71-11-02/201, Fan Cowl Panels
(3)
AMM 72-33-03/401, Fan Duct Panels
(4)
AMM 75-32-00/201, Variable Bleed Valve System
(5)
AMM 75-32-02/501, Bleed Valve Stop Mechanism
(6)
AMM 78-31-00/201, Thrust Reverser System
D. Access
(1)
Location Zones 506 Engine No. 1 - 9 o'clock position on the fan frame 606 Engine No. 2 - 9 o'clock position on the fan frame
(2)
Access Panels
5783L Engine No. 1 - Thrust Reverser Half
5838R Engine No. 2 - Thrust Reverser Half
E. Procedure (Fig.401)
S 724-032-C00
(1) Do a check that the translating nut in the bleed valve and master ballscrew actuator moves freely.
NOTE: To do this, operate the master ballscrew actuator with the
____ VBV control drive (flexible shaft end). Use the dual purpose ratchet wrench.
S 824-033-C00
(2)
Set the bleed valve near the closed position.
S 214-034-C00
(3)
Do a check that the stop mechanism of the bleed valve is in the closed stop position.
NOTE: To do this, turn the main flexible shaft in the direction
____ shown by the arrow on the stop mechanism housing.
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