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 C.  Each of the doors have numbers for identification. The 500 series doors are installed on the left wing. The 600 series doors are installed on the right wing. Look at Fig. 401 for the door location.
 D.  The access doors for the main fuel tanks shown below are high impact resistant doors and they must not be replaced with a standard door:
 THE LEFT WING THE RIGHT WING 544AB 644AB 545AB 645AB 546AB 646AB 546BB 646BB 552AB 652AB 552BB 652BB 552CB 652CB 552DB 652DB 552EB 652EB
 (1)  
The cast aluminum access doors and the high impact-resistant access doors are sealed with a rubber seal ring. If the seal on a high impact-resistant door or a new replacement access door has a leak (the seal becomes loose but has no damage), you can replace the seal. Refer to this task: High Impact-Resistant Access Door Seal Replacement (AMM 28-11-00/801).

 E.  
Make sure that you remove the electrical power from the airplane before you remove the access door.

 (1)  
Make sure you do not put back the power until the tank is closed and safe.

 TASK 28-11-02-004-001
 2.  Reserve or Main Tank Access Door Removal (Fig. 402)________________________________________
 A.  Equipment
 (1)  
Rubber Cover - for tank access opening

 B.  
References

 (1)  
AMM 24-22-00/201, Manual Control

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 28-11-02
 ALL  ú ú 01 Page 401 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
NO. 2
CENTERLINE

____NOTE:  THE 500 NUMBER SERIES IS USED WITH THE LEFT WING. 
THE 600 NUMBER SERIES IS USED WITH THE RIGHT WING. 
1  HIGH IMPACT RESISTANT DOOR (SEE  B  ) 

Reserve and Main Tank Access Door Identification
Figure 401 (Sheet 1)

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 28-11-02
 ALL  ú ú 01 Page 402 ú Feb 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

FILLER HONEYCOMB ALUMINUM 
A  A 
A  A 
STANDARD ACCESS DOOR A  B HIGH IMPACT RESISTANT ACCESS DOOR 

CAPTIVE NUT  MOLDED RUBBER SEAL 
RIB (STANDARD DOOR ONLY)
ACCESS DOOR  GASKET KNITTED ALUMINUM  A-A BOLT  CLAMP RING  LOWER WING SKIN 
Reserve and Main Tank Access Door Identification Figure 401 (Sheet 2) 

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 28-11-02
 ALL  ú ú 01 Page 403 ú Feb 10/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (2)  
AMM 28-11-00/201, Fuel Tanks

 (3)  
AMM 28-26-00/201, Defueling

 (4)  
AMM 28-44-02/401, Fuel Measuring Stick Housing

 (5)  
AIPC 28-11-02, Fig. 1

 C.
Access

 (1)  
Location Zones 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 546 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 552 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 553 Reserve Tank, Front Spar to Rear Spar, Left 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 646 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 652 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 653 Reserve Tank, Front Spar to Rear Spar, Right

 D.
Procedure

 S 654-030
 (1)  
Defuel the applicable fuel tank(s) (AMM 28-26-00/201).

 S 864-005

 (2)  
Remove the electrical power (AMM 24-22-00/201).

 S 864-032
 WARNING:_______OBEY ALL THE RELATED SAFETY PROCEDURES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT FOLLOW THE SAFETY PROCEDURES.
　
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