28-22-31
 ALL  ú ú 02 Page 403 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 864-016
 (9)  
Set the battery switch to the ON position.

 S 714-017

 (10)
 Set the APU master switch to the ON position.

 (a)  Make sure the valve override handle moves to the OPEN position.
 S 714-018
 (11) Set the APU master switch to the OFF position.
 (a)  Make sure the valve override handle moves to the CLOSED position.
 S 864-019
 (12) Set the battery switch to the OFF position.
 TASK 28-22-31-004-020
 4.  APU Shutoff Valve Body Assembly Removal (Fig. 401)_______________________________________
 A. Equipment
 (1)  Container - suitable to hold the residual fuel from the APU fuel line
 B. References
 (1)  
AMM 28-10-00/201, Fuel Storage

 (2)  
AMM 28-11-11/401, Integral Fuel Tank Access Panels

 C. Access
 (1)  
Location Zone
 305 Left Fuel Tank

 (2)  
Access Panels
 7202 Fuel Tank Access Door

 D. Procedure
 S 654-021
 (1)  
Defuel the No. 1 fuel tank and prepare to go into it (AMM 28-10-00/201).

 S 014-022

 (2)  
Get access to the wing rear spar.

 (a)  Remove the No. 1 access panel for the No. 1 fuel tank (AMM 28-11-11/401).

 (3)
Do the task, "APU Shutoff Valve Actuator Assembly Removal".

 S 014-024

 (4)  
Get access to the valve through the No. 1 access panel (7202) and the applicable rib access openings (AMM 28-11-11/401).

 S 034-025

 (5)  
Put the container below the valve and disconnect the APU fuel line.

 S 034-023
 (a) Remove the unions and keep them for the installation.
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 28-22-31
 ALL  ú ú 01 Page 404 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 024-026
 CAUTION:_______DO NOT LET THE VALVE BODY ASSEMBLY FALL. YOU WILL CAUSE DAMAGE TO THE FUEL TANK SEAL.
 (6)  Remove the valve body assembly.
 (a)  
Two persons are necessary to do this task. 1) One person must be out of the tank. 2) One person must be in the tank.

 (b)  
The person in the tank must hold the valve body assembly up.

 (c)  
The person out of the tank must remove the mounting screws for the body assembly.

 (d)  
Move the valve body assembly away from the tank.

 TASK 28-22-31-404-027
 5.  APU Shutoff Valve Body Assembly Installation____________________________________________
 A. Consumable Materials
 (1)  B00316 - Solvent, Aliphatic Naphtha TT-N-95
 B. References
 (1)  
AMM 28-10-00/201, Fuel Storage

 (2)  
AMM 28-11-11/401, Integral Fuel Tank Access Panels

 C. Access
 (1)  
Location Zone
 305 Left Fuel Tank

 (2)  
Access Panels
 7202 Fuel Tank Access Door

 D. Procedure
 S 164-028
 (1)  Clean these surfaces with the aliphatic naphtha and dry them with a clean lintfree cloth.
 (a)  
The O-ring groove of the valve body assembly

 (b)  
The machined surfaces of the valve body assembly

 (c)  
The machined surfaces of the rear spar.

 S 434-029
 (2)  
Install some new O-rings, lightly lubricated with fuel, on the unions and install them in the valve body assembly.

 S 434-030

 (3)  
Install a new O-ring, lightly lubricated with fuel, in the groove on the valve body assembly.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-22-31
 ALL  ú ú 01 Page 405 ú Jul 15/91
　
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