747-400
MAINTENANCE MANUAL

FUEL JETTISON TRANSFER VALVE BODY
SEE A
BOLT
(12 LOCATIONS)

DISCHARGE LINE
WASHER
(12 LOCATIONS)

GASKET
REAR SPAR
VALVE BODY
WASHER (4 LOCATIONS) GASKET
MOUNTING BOLT (4 LOCATIONS)
GASKET SEAL FWD
FUEL JETTISON TRANSFER VALVE BODY
A

Fuel Jettison Transfer Valve Body (Center Wing Tank)
Figure 401

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 28-31-06
 ALL  ú ú 01 Page 404 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 434-014
 (3)  
Install the mounting screws and washers (4 locations) from out of the tank.

 S 434-015

 (4)  
Put the new gaskets in their positions on the discharge line flanges.

 S 434-035

 (5)  
Install the bolts and washers (12 locations) to attach the valve body to the discharge line.

 S 414-016

 (6)
Install the spanwise beam access doors (AMM 28-11-09/401).

 S 864-017

 (7)
Go out of and close the center wing tank (AMM 28-11-00/201).

 S 414-018

 (8)
Install the jettison transfer valve actuator (AMM 28-31-04/401).

 S 714-042

 (9)  
Do this task: Fuel Jettison Transfer Valves - Fuel Transfer Operational Test (AMM 28-31-00/501).

 TASK 28-31-06-004-019
 4. Jettison Transfer Valve Body in the Inboard Main Tank Removal (Fig. 402)
_____________________________________________________________
 A. References
 (1)  
AIPC 28-31-06 Fig. 2

 (2)  
AMM 28-11-00/201, Fuel Tanks

 (3)  
AMM 28-26-00/201, Defueling

 B.
Access

 (1)  
Location Zones 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right

 C.
Procedure

 (1)
Defuel the applicable inboard main tank (AMM 28-26-00/201).

 S 654-020
 S 864-032
 WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL AND GO INTO
_______ THE FUEL TANKS. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT FOLLOW THE SAFETY PROCEDURES.
 (2)  Purge and go into the fuel tank through the access opening 544AB or 644AB (AMM 28-11-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 405 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 034-022
 (3)  
Disconnect the couplings on the jettison transfer line from the valve body.

 S 034-036

 (4)  
Discard the packings.

 S 034-023

 (5)  
Remove the bolts and washers (4 locations) that attach the valve body to the mounting bracket.

 S 024-024

 (6)  
Move the valve body away from the mounting bracket, to disengage the splines of valve body and adapter shaft.

 S 024-037

 (7)  
Remove the valve body from the tank.

 TASK 28-31-06-404-025
 5.  Fuel Jettison Transfer Valve Body in the Inboard Main Tank Installation_______________________________________________________________________ (Fig. 402)
 A.  References
 (1)  
AIPC 28-31-06 Fig. 2

 (2)  
AMM 12-11-01/301, Fuel Servicing

 (3)  
AMM 28-11-00/201, Fuel Tanks

 (4)  
AMM 28-31-00/501, Fuel Jettison System

 B.  
Access

 (1)  
Location Zones 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right

 C.  
Procedure

 (1)  
Make sure the actuator is in the closed position.

 (2)  
Engage the valve body with the adapter shaft.

 (3)  
Make sure the index marks on the adapter shaft and valve body align.
　
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