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 (5)  Use fuel or oil to operate the VBV system to the closed door position.
 NOTE: To do this, apply and keep a pressure of 100-300 psi
____ (1400-2100 kPa) to the closed end tube of the VBV. When the VBV system closes, it must move freely and smoothly. The system must start to close at 100 psi (700 kPa) and must continue until it gets to the stop position. When the system gets to the stop position, it is shown by an increase in gage pressure during the hand pump operation. The gage pressure will decrease if you stop the hand pump operation.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
VBV OPEN END TUBE
VBV CLOSED END TUBE
MEC
SUPPLY AND
RETURN HOSES

HAND PUMP
HYDRAULIC
CART

S-M56-MM-1010-(1)-01-B
Variable Bleed Valve (VBV) System Actuation - External Pressure Source
Figure 201

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
S 862-007-C00
 (6) Use fuel or oil to operate the VBV system to the open door position.
 NOTE: To do this, apply and keep a pressure of 100-300 psi
____ (1400-2100 kPa) to the open end tube of the VBV. When the VBV system opens, it must move freely and smoothly. The system must start to open at 100 psi (700 kPa) and must continue until it gets to the stop position. When the system gets to the stop position, it is shown by an increase in gage pressure during the hand pump operation. The gage pressure will decrease if you stop the hand pump operation.
 S 092-008-C00
 (7)  Remove the external pressure source.
 (a)  Disconnect the hoses of the hydraulic cart pump from the VBV open and closed end tubes.
 S 092-009-C00
 (8)  
Remove the caps from the MEC fittings.

 S 432-010-C00

 (9)  
Connect the coupling nut of the VBV open end to the MEC OPEN fitting.

 (a)  Tighten it to 270-300 pound-inches
 (30.5-33.9 Newton meters).

 S 432-011-C00
 (10) Connect the coupling nut of the VBV closed end to the MEC CLOSE fitting.
 (a)  Tighten it to 270-300 pound-inches
 (30.5-33.9 Newton meters).

 S 412-012-C00
 (11)
 Close the left fan cowl panel (AMM 71-11-02/201).

 S 792-013-C00

 (12)
 Do a test of the engine with the Power Plant Test Reference Table, Test No. 3 (AMM 71-00-00/501).

 (a)  Do a check for leaks at the VBV open and closed end tube connections at the MEC.
 TASK 75-32-00-982-014-C00
 3.  VBV System Actuation Procedure - Manual Movement________________________________________________
 A. Equipment
 (1)  856A2501, Wrench - VBV Manual Actuation Dual Purpose Ratchet, CFM International, P.O. Box 15514, Cinncinnati, OH 45215
 B. References
 (1)  
AMM 71-11-02/201, Fan Cowl Panels

 (2)  
AMM 72-33-03/401, Fan Duct Panels

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(3)  AMM 78-31-00/201, Thrust Reverser System
 C. Access
 (1)  
Location Zones
 506 Engine No. 1 - Fan Frame
 606 Engine No. 2 - Fan Frame

 (2)  
Access Panels
　
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