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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
CONDITIONED AIR CHECK VALVE - REMOVAL/INSTALLATION
__________________________________________________
1. General_______
A. There are two tasks in this procedure. There is one task for the removal and one task for the installation of a conditioned air check valve. The procedure has these parts:
(1)
The installation of the landing gear ground locks and door locks
(2)
The removal of the floor panels to get to the valve
(3)
The removal of the conditioned air check valve
(4)
The installation of the conditioned air check valve
(5)
An inspection of the valve installation for air leaks.
B. There is a conditioned air check valve for each of the three air conditioning packs. The check valves are installed on the forward bulkhead of the wing gear wheel well.
C. The removal and installation procedure is the same for all three check valves.
D. Access to the check valves is through a main deck floor panel and the wing gear wheel well.
TASK 21-21-01-004-001
2. Conditioned Air Check Valve Removal (Fig. 401)___________________________________
A. References
(1)
09-11-00/201, Towing
(2)
25-58-01/401, Lock/Stop Roller/Castor Trays
(3)
32-00-30/201, Landing Gear Door Locks
(4)
53-21-02/401, Main and Upper Deck Floor
(5)
IPC 21-23-52 Fig. 2
(6)
IPC 21-23-63 Fig. 1
B. Access
(1) Location Zone
135 Wing Landing Gear Well, LH
136 Wing Landing Gear Well, RH
241 Main Deck, LH
242 Main Deck, RH
C. Procedure
S 864-002
(1) Make sure that all three PACKS switches on the P5 overhead panel are set to OFF.
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ALL ú ú 04 Page 401 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
PACK 1
CHECK VALVE
SEE A
SEE B PACK 2
CHECK VALVE
PACK 3
CHECK VALVE
SUPPORT
ROD
SUPPORT
ROD CLAMP
FWD
AIR CONDITIONING
EQUIPMENT BAY
DUCT ASSEMBLY
CLAMP
A
Conditioned Air Check Valve Installation
Figure 401 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
WING GEAR
WHEEL WELL
FORWARD
BULKHEAD
(REF)
GASKET
SEAL SUPPORT
ROD
CHECK
VALVE
NUT AND WASHER (16 LOCATIONS)
DUCT BONDING CLAMP
SUPPORT ROD
AIRFLOW JUMPER BONDING SENSOR
ELECTRICAL CONNECTOR
B
Conditioned Air Check Valve Installation Figure 401 (Sheet 2)
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