(10) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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A
747-400 MAINTENANCE MANUAL
WING ANTI-ICE VALVE - REMOVAL/INSTALLATION
__________________________________________
1. General_______
A. There are two tasks in this subject. There is one task for the removal and one for the installation of the wing anti-ice valve. The procedure has these parts:
-Extension of the LE flaps and installation of safety locks
-Removal of the wing anti-ice valve
-Installation of the replacement valve
-Operational test of the system.
B. The removal and installation procedure is the same for the left or the right wing anti-ice valve.
TASK 30-11-03-004-001
2. Wing Anti-Ice Valve Removal (Fig. 401)___________________________
A. References
(1)
AMM 27-81-00/201, Leading Edge Flaps
(2)
AMM 36-00-00/201, Pneumatic System
(3)
SSM 30-11-01
(4)
WDM 30-11-11
B. Access
(1) Location Zones 531 Leading Edge to Front Spar, Left Wing at Outboard Engine 631 Leading Edge to Front Spar, Right Wing at Outboard Engine
C. Procedure
S 864-002
(1)
Extend the leading edge flaps (AMM 27-81-00/201).
(2)
Install safety locks on the leading edge flaps (AMM 27-81-00/201).
S 864-004
(3)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
S 494-019
(a) P6, Main Power Distribution Panel
1) 6C8, WING TAI VLV
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747-400
MAINTENANCE MANUAL
SEE A
PNEUMATIC MANIFOLD
SEE B
1. CONNECTOR ELECTRICAL 2. JUMPERS BONDING 1 VALVE POSITION INDICATOR
3. VALVE A
4. NUT A A HANDLE MANUAL CONTROL
5. COUPLING V-BAND
5. V-BAND COUPLING 4. NUT DUCT FLANGE
B 3. VALVE
1 SOME VALVES HAVE ONLY ONE BONDING JUMPER A-A 6. ASSEMBLY SEAL
Wing Anti-Ice Valve Installation Figure 401
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747-400 MAINTENANCE MANUAL
2) 6C9, WING TAI CONT
S 844-005
WARNING: MAKE SURE THAT YOU RELEASE THE PRESSURE IN THE PNEUMATIC
_______ SYSTEM. IF THERE IS PRESSURE IN THE PNEUMATIC SYSTEM WHEN YOU REMOVE THE WING ANTI-ICE VALVE, THE SUDDEN FLOW OF BLEED AIR CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(4)
Make sure that there is no pressure in the wing pneumatic manifold (AMM 36-00-00/201).
S 024-007
(5)
Remove the wing anti-ice valve:
(a)
Disconnect the electrical connector DV152 (left) or DV153 (right) (1) from the valve (3).
(b)
Disconnect the bonding jumpers (2) from the valve (3).
NOTE: Some valves have only one bonding jumper.
____
(c)
Remove the nut (4) from the T-bolts on the two V-band couplings (5).
(d)
Hold the valve (3). 1) Loosen both V-band couplings (5). 2) Move the V-band couplings (5) away from the valve (3).
(e)
Move the valve (3) out of position and remove the two seals (6).
TASK 30-11-03-404-008
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