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__________________________________________________
 1.  General_______
 A.  This section contains instructions for the removal and installation of the access door in the wing surge tank.
 B.  The access doors for the surge tank are installed in the wing lower skin, outboard of the reserve tanks.
 C.  When the surge tank access doors are installed you must align the long nut retainer with the notch in the access door opening. This prevents the incorrect location of the surge tank access doors.
 D.  Make sure that you remove the electrical power from the airplane before the access door is removed. Do not put back the electrical power until the tank is closed and safe.
 TASK 28-11-03-004-001
 2.  Access Door for the Wing Surge Tank Removal (Fig. 401)____________________________________________
 A.  Equipment
 (1)
Cover - rubber, for tank access opening

 B.  
References

 (1)
AMM 24-22-00/201, Manual Control

 (2)
AIPC 28-11-02, Fig. 8

 C.  
Access

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

 D.  
Procedure

 (1)
Remove the electrical power (AMM 24-22-00/201).

 (2)
Hold the clamp ring and remove the mounting bolts (21 locations).

 (3)
Remove the clamp ring and the aluminum gasket from the access door.

 (4)
Put the clamp ring and the aluminum gasket in a flat container.

 S 864-002
 S 034-003
 S 034-004
 S 034-015
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-11-03
 ALL  ú ú 01 Page 401 ú Feb 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 024-005
 CAUTION: DO NOT PUT AN OBJECT BETWEEN THE WING SKIN AND THE ACCESS DOOR
_______ TO OPEN THE DOOR. DAMAGE TO THE SURFACES THAT SEAL ON THE WING SKIN OR THE ACCESS DOOR CAN CAUSE A LEAK.
 (5)  Push the access door up and remove the access door from the fuel tank.
 NOTE: If the door cannot be easily removed, hit the door lightly
____ around the edge with a rubber mallet.
 S 034-006
 (6)  Install the rubber cover around the access door opening.
 TASK 28-11-03-404-007
 3. Access Door for the Wing Surge Tank Installation
_________________________________________________ (Fig. 401, 402)
 A. Consumable Materials
 (1)  
B00083 Solvent - Aliphatic Naphtha, TT-N-361

 (2)  
Grease, Anticorrosion - Aero Shell No. 14, MIL-G-25537

 (3)  
Cloth - Clean, Lint-free

 B.
References

 (1)  
AIPC 28-11-02, Fig. 8

 C.
Access

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

 D.
Procedure

 S 434-008
 (1)  
Remove the rubber cover from the access opening.

 S 114-009

 (2)  
Clean all the surfaces that seal, and the clamp ring.

 (a)  
Use a lintfree cloth that is moist with solvent.

 S 214-010
 (3)  
Make sure the aluminum gasket is serviceable.

 (a)  
The gasket is not serviceable if one of these conditions occur: 1) The gasket has torn fastener holes 2) extended out of shape 3) Has more than 10% of the strands broken through the

 thickness of the gasket in one area.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-11-03
 ALL  ú ú 01 Page 402 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

NO. 1 NO. 2 
MAIN TANK  RESERVE TANK  SURGE 
TANK 
WING SURGE TANK 
ACCESS DOOR 
SEE  A 

ACCESS
DOOR PRESSURE RELIEF VALVE
WING LOWER SKIN
GASKET
(KNITTED ALUMINUM)
　
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