(13)
 Put the pressure back to 0 psig.

 S 092-018

 (14)
 Remove the vacuum source and the check fixture.

 S 432-019

 (15)
 Install the bolts removed from the access door.

 S 432-020

 (16)
 Tighten the bolts to 35-40 pound-inches.

 S 222-021

 (17)
 Pull the T-handle down to set the valve.

 S 212-022

 (18)
 Make sure the valve poppet is in the center of the seat.

 TASK 28-13-05-702-001
 3. Wing Surge Tank Pressure Relief Valve - (Manual Operation)________________________________________________________________Test
 A. References
 (1)
IPC 28-11-02 Fig. 8

 B.
Access

 (1)  
Location Zones 555 Surge Tank, Front Spar to Rear Spar, Left 656 Surge Tank, Front Spar to Rear Spar, Right

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A
747-400 MAINTENANCE MANUAL
 C. Procedure
 S 012-002
 (1)  
Put the screwdriver into the pressure sense hole on the valve. Push the screwdriver up.

 S 282-004

 (2)  
Make sure that the pressure relief valve opens.

 NOTE: The pressure relief valve will make a sudden noise and
____ you will feel the valve poppet quickly move away from the screwdriver. It is necessary to apply approximately 35 pounds of force to operate the valve.
 S 712-003
 (3)  Pull the T-handle down to set the valve.
 NOTE: It is necessary to apply approximately 55 pounds of force
____
 to set the valve.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 WING SURGE TANK PRESSURE RELIEF VALVE - REMOVAL/INSTALLATION
____________________________________________________________
 1.  General_______
 A.  This section supplies instructions for the removal and installation of the pressure relief valves in the wing surge tank.
 B.  The pressure relief valves are installed in the access doors 555AB, 555BB, 655AB, and 655BB for the wing surge tank. The pressure relief valve and the access door are removed as a unit. Remove the valve from the door after you remove the access door.
 TASK 28-13-05-004-001
 2.  Wing Surge Tank Pressure Relief Valve Removal (Fig. 401)_____________________________________________
 A.  References
 (1)  
AMM 28-11-03/401, Wing Surge Tank Access Door

 (2)  
AIPC 28-11-02 Fig. 8

 B.  
Access

 (1)  
Location Zones 555 Surge Tank, Front Spar to Rear Spar, Left 655 Surge Tank, Front Spar to Rear Spar, Right

 (2)  
Access Panels
 555AB Surge Tank Access Door
 655AB Surge Tank Access Door

 C.  
Procedure

 S 014-002
 (1)  Remove the applicable access door 555AB, 555BB, 655AB, or 655BB found on the wing surge tank (AMM 28-11-03/401).
 S 034-014
 WARNING:_______KEEP YOUR FINGERS AWAY FROM THE POPPET SPRING (VIEW A-A). THE SPRING FORCE IS EXTREMELY STRONG AND CAN CAUSE INJURY TO YOUR FINGERS.
 (2)  
Do these steps to remove the pressure relief valve (1) (View A):

 (a)  
Remove the mounting bolts (4) that attach the pressure relief valve to the access door (3) (8 locations).

 (b)  
Remove the pressure relief valve (1) from the access door.

 (c)  
Discard the packing (2).

 TASK 28-13-05-404-005
 3.  Wing Surge Tank Pressure Relief Valve Installation (Fig. 401)__________________________________________________
 A.  Equipment
 (1)  Bonding Meter (SWPM 20-20-00)
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