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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 014-039
 (2)  Remove the cargo handling hardware and floor panels to get access to the check valves (AMM 25-58-01/401, AMM 53-21-02/401).
 NOTE: The check valves are installed at STA 1250.
____
 S 494-005
 (3)  Make sure the landing gear ground locks are installed (Ref 09-11-00/201).
 S 494-031
 WARNING: REFER TO THE SPECIFIED PROCEDURE TO INSTALL THE DOOR LOCKS
_______ CORRECTLY. THE DOORS CAN CLOSE QUICKLY IF YOU INSTALL THE DOOR LOCKS INCORRECTLY. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT.
 (4)  
Install the body and the wing gear door locks (AMM 32-00-30/201).

 S 024-029

 (5)  
Remove the check valve:

 (a)  Remove the electrical connector from the airflow sensor (pack 1 - DT423, pack 2 - DT424, pack 3 - DT425).
 NOTE: The airflow sensor is installed in the conditioned air
____ duct that goes through the wing gear wheel well.
 (b)  
Remove the clamp from the bottom end of the duct
 (detail A, Fig. 401).

 (c)  
Remove the bonding jumper from the duct bonding clamp.

 (d)  
Remove the support rods from the duct section and remove the duct from the airplane.

 (e)  
Remove the washers and nuts from the bolts (16 locations), and remove the check valve and the gasket from the bulkhead.

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 21-21-01
 ALL  ú ú 04 Page 404 ú Oct 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (f)  Put a cover on the duct openings to prevent entry of unwanted objects.
 TASK 21-21-01-404-013
 3.  Conditioned Air Check Valve Installation________________________________________
 A. Consumable Materials
 (1)  
B00600 Alcohol - Isopropyl

 (2)  
G01043 Cloth - Lint-Free

 B. References
 (1)  
21-00-00/201, Air Conditioning

 (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.

 C. Access
 (1)  Location Zone
 135 Wing Landing Gear Well, LH
 136 Wing Landing Gear Well, RH
 241 Main Deck, LH
 242 Main Deck, RH

 D. Procedure
 S 424-030
 (1)  Install the check valve:
 (a)  
Remove the covers from the duct openings.

 (b)  
Put the gasket and valve into their position on the bulkhead and install the bolts, washers and nuts (16 locations).

 (c)  
Rub the mating surfaces of the duct and the valve with a clean lint-free cloth that is moist with isopropyl alcohol.

 (d)  
Install the new seal in the end of the duct.

 (e)  
Install the end of the duct that contains the seal on the check valve.

 NOTE:____It is not necessary to lubricate the seal. The seal is lubricated by the manufacturer.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-21-01
 ALL  ú ú 05 Page 405 ú Oct 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (f)  
Attach the support rods to the duct assembly.

 (g)  
Install the bonding jumper on the duct bonding clamp.

 (h)  
Install the clamp assembly. Tighten the clamp to 70 (| 5) inch pounds.

 (i)  
Install the electrical connector on the airflow sensor (pack 1 - DT423, pack 2 - DT424, pack 3 - DT425).

 S 864-023
 (2)  
Supply conditioned air to the airplane (21-00-00/201).

 S 794-024

 (3)  
Do a check for leaks at the duct joints that were disassembled.
　
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