(10) Close the applicable access door (AMM 06-09-03/201).
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A
747-400 MAINTENANCE MANUAL
WING ISOLATION VALVE - REMOVAL/INSTALLATION
___________________________________________
1. General
_______
A. This gives procedures for these tasks:
(1)
The removal of the wing isolation valve
(2)
The installation of the wing insolation valve.
NOTE: This task contains a leak test of the valve after its
____
installation.
(3)
An operational check of the wing isolation valve.
(4)
A visual check of the wing isolation valves.
B.
The two isolation valves are installed in the pneumatic manifold aft of the air-conditioning bay. It is necessary to open the applicable air-conditioning access door to get access to the valves.
C.
It is necessary to remove the pack no. 1 water separator to get access to the left wing isolation valve.
TASK 36-11-07-004-001
2. Wing Isolation Valve Removal (Fig. 401)
____________________________
A. References
(1)
AMM 06-09-03/201, Body Section 44 Access Doors and Panels
(2)
AMM 21-51-05/201, Water Separator
(3)
AMM 24-22-00/201, Manual Control
(4)
AMM 36-00-00/201, Pneumatic System
B.
Access
(1)
Location Zone 191 Fairing, Wing To Body, Forward Lower Half, LH 192 Fairing, Wing To Body, Forward Lower Half, RH
(2)
Access Panel
191NL Air-Conditioning Access Door
192NR Air-Conditioning Access Door
C.
Procedure
(1)
Supply the electrical power (AMM 24-22-00/201).
(2)
Release the pressure in the pneumatic system (AMM 36-00-00/201).
S 864-004
(3)
Put the opposite wing ISLN switch (P5 Pilots' Overhead Panel) in the closed position.
S 864-002
S 864-003
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A
747-400
MAINTENANCE MANUAL
PACK NO. 1
LEFT WING WATER SEPARATOR
ISOLATION
VALVE
AIR CONDITIONING
PACKS SEE B
SEE A
RIGHT WING ISOLATION VALVE
SEE B FWD
AIR CONDITIONING PACKS
CLAMP
A
(2 LOCATIONS) BONDING JUMPER
FLOW DIRECTION INDICATOR
1
ELECTRICALDUCT CONNECTOR
OUTBD FWD
LEFT WING ISOLATION VALVE IS SHOWN (RIGHT WING ISOLATION VALVE IS SIMILAR)
1 ON RIGHT WING ISOLATION
VALVE, FLOW DIRECTION B
INDICATOR POINTS INBOARD.
Wing Isolation Valve Installation
Figure 401
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747-400 MAINTENANCE MANUAL
(4) S 864-035Put the ISLN switch for the valve that you will remove in the open position.
(5) S 864-005Put the APU VALVE switch in the closed position.
S 864-006
WARNING: YOU MUST RELEASE THE PRESSURE IN THE DUCT BEFORE YOU REMOVE A
_______ PNEUMATIC SYSTEM COMPONENT. HIGH PRESSURE AIR CAN CAUSE INJURY TO PERSONS.
(6)
Open the wing anti-ice valves to release the pressure in the pneumatic ducts (AMM 36-00-00/201).
S 014-007
(7)
Open the access door 192NR for the right isolation valve or 191NL for the left isolation valve (AMM 06-09-03/201).
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