(3)
Remove the tail support equipment, if installed (AMM 07-11-08/201).
S 864-072
(4)
Remove the electrical power if it is not necessary for other tasks (AMM 24-22-00/201).
S 084-065
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A
747-400 MAINTENANCE MANUAL
MAIN TANK TRANSFER VALVE ACTUATOR - REMOVAL/INSTALLATION
________________________________________________________
1. General_______
A. This section supplies instructions to remove and install the transfer valve actuator for the main tank.
B. The transfer valve actuators for the main tanks are installed on the rear spar of each wing. They are found inboard of the inboard engine strut.
C. The access to the actuators is through the access panels in the inboard aileron actuator.
TASK 28-16-04-004-001
2. Transfer Valve Actuator for the Main Tank Removal (Fig. 401)_________________________________________________
A. References
(1)
AIPC 28-16-04, Fig. 1
(2)
AMM 27-51-00/201, Trailing Edge Flap System
(3)
SSM 28-16-01
(4)
WDM 28-16-11
(5)
WDM 28-16-14
B.
Access
(1)
Location Zone 573 Rear Spar to Inbd Aileron Leading Edge, Left 673 Rear Spar to Inbd Aileron Leading Edge, Right
(2)
Access Panel
573AT Access Panel
673AT Access Panel
C.
Procedure
S 094-033
WARNING: MAKE SURE THAT PERSONS AND THE EQUIPMENT ARE CLEAR BEFORE YOU
_______ MOVE THE FLAP CONTROL LEVER. THE LEADING EDGE FLAPS, THE TRAILING EDGE FLAPS AND THE FLAP DRIVE MECHANISMS WILL MOVE. WITH HYDRAULIC POWER REMOVED, ELECTRICAL POWER WILL MOVE THE FLAPS AUTOMATICALLY WHEN YOU MOVE THE FLAP CONTROL LEVER.
(1) Do this task: Deactivation of the Trailing Edge Flaps (AMM 27-51-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 864-034
(2)
Open these circuit breakers and remove the DO-NOT-CLOSE tags:
(a)
On the overhead circuit breaker panel, P7: 1) 7H21, FUEL XFR VALVE MAIN 1 2) 7H24, FUEL XFR VALVE MAIN 4
S 864-002
(3)
Open the circuit breaker 7H21 FUEL XFR VALVE MAIN 1 or 7H24 FUEL XFR VALVE MAIN 4 on the P7 Overhead Circuit Breaker Panel and attach a DO-NOT-CLOSE identifier.
S 014-003
(4)
Open the applicable access panel 573AT or 673AT.
S 034-004
(5)
Disconnect the electrical connector DV55, from the valve actuator, V55 (No. 1 main tank) or the connector DV50 from the actuator, V50 (No. 4 main tank).
S 984-005
(6)
Put the manual override lever for the valve actuator to the closed position.
S 034-006
(7)
Remove the bolt, the washers, and the nut that attach the bonding jumper to the lug on the actuator.
S 034-007
(8)
Remove the screws and the washers (4 locations) that attach the actuator to the index plate.
S 024-008
(9)
Remove the actuator and disengage the actuator shaft that has splines from the adapter plate.
TASK 28-16-04-404-009
3. Transfer Valve Actuator for the Main Tank Installation (Fig. 401)
______________________________________________________
A. Equipment
(1)
Bonding Meter (SWPM 20-20-00) Approved for use in fuel vapor areas
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