S 824-057-C00
(36) Adjust the VBV feedback cable (AMM 75-32-05/501).
NOTE: The connection of the feedback cable to the MEC feedback arm
____ and the reverser arm of the stop mechanism is made during the test procedure.
S 714-058-C00
(37) Do an operational check (AMM 75-32-00/201).
(a) Manually operate the VBV system thru two closed/open/closed cycles.
NOTE: Make sure the feedback cable linkage can move freely.
____
S 414-059-C00
(38) Close the thrust reverser halves (AMM 78-31-00/201).
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
VARIABLE BLEED VALVE (VBV) FEEDBACK CABLE - ADJUSTMENT/TEST
___________________________________________________________
1. General
_______
A. This procedure supplies the necessary steps to adjust the feedback cable of the variable bleed valve (VBV). You must do this procedure after the removal or replacement of the:
-Feedback cable
-Fuel gear motor and stop mechanism assembly of the bleed valve
-Main engine control (MEC).
B. Three adjustments are given:
-
A resistance check
-
A travel check
-
A static rig check.
(1)
The resistance check makes sure that the force necessary to move the feedback cable is not more than a specified limit.
(2)
The travel check makes sure that the VBV doors can operate through their full travel range (while they do not push the MEC internal mechanism more than its usual travel range).
(3)
The static rig check makes sure that the feedback signal transmitted to the MEC is sychronized with the door position.
TASK 75-32-05-825-001-C00
2. Variable Bleed Valve Feedback Cable Adjustment
______________________________________________
A. Equipment
(1) Pull Scale - 0-25 pounds (0-120 N) capacity
B. Consumable Materials
(1) Grease - Graphite CP2101 (AMM 70-10-01/201)
C. References
(1)
AMM 70-10-01/201, Consumable Materials
(2)
AMM 75-32-00/201, Variable Bleed Valve System
(3)
AMM 78-31-00/201, Thrust Reverser System
D. Access
(1) Location Zones
506 Engine No. 1 - 6 o'clock strut area
606 Engine No. 2 - 6 o'clock strut area
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(2) Access Panels
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