B.  
Access

 (1)  
Location Zone 191 Fairing Wing to Body Forward Lower Half, LH 192 Fairing Wing to Body Forward Lower Half, RH

 (2)  
Access Panel
 125B Door - Electronics Access

 C.  
Procedure

 S 014-002
 (1)  
Open the door.

 S 024-003

 (2)  
Remove the door.

 (a)  
Remove the bonding jumper.

 (b)  
Remove the hinge bolts.

 (c)  
Put tags on the washers to subsequently identify their location.

 (d)  
Remove the door from the airplane.

 TASK 52-48-04-404-004
 3.  Center Electronic Bay External Access Door Installation (Fig. 401)
_______________________________________________________
 A.  Consumable Materials
 (1)  
C00523 Coating - Alodine, Clear, MIL-C-5541

 (2)  
D00013 Grease - MIL-G-23827

 B.  
References

 (1)  
24-22-00/201, Manual Control

 (2)  
51-21-04/701, Alodized Surfaces

 (3)  
52-09-00/801, Door Seals

 (4)  
52-09-02/201, Flap-Type Mechanical Seals

 (5)  
IPC 52-48-04 Fig. 3

 (6)  
SSM 52-71-01

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 52-48-04
 ALL  ú ú 01 Page 401 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

STA 
STA  1000 
STA  900 
STA  800 
740 

LATCH PIN  KEEPER LATCH  SEE  A 
C 
BONDING JUMPER 
DOOR SKIN  DOOR STOP (4 LOCATIONS)  B B  A  C  HINGE ARM (2 LOCATIONS)  BOLT  HINGE 
BOLT  A  HINGE BOLT  FWD 
A 
Center Electronic Bay External Access Door Installation Figure 401 (Sheet 1) 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

THE DOOR IS OPEN
A-A

B-B
LATCH KEEPER

OUTSIDE  HANDLE 
DOOR SKIN 
(THE D00R IS CLOSED AND LOCKED) 
C-C 

Center Electronics Bay External Access Door Installation
Figure 401 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (7)  
WDM 52-71-11

 C.  
Access

 (1)  
Location Zone
 191 Fairing Wing to Body Forward Lower Half, LH
 192 Fairing Wing to Body Forward Lower Half, RH

 (2)  
Access Panel
 125B Door - Electronics Access

 D.  
Procedure

 S 214-017
 (1)  
Examine the door seal.

 (a)  
Look for damage.

 (b)  
Repair the seal if it is necessary (Ref 52-09-00/801).

 S 424-018
 (2)  
Install the door.

 (a)  
Put the door in the door opening.

 (b)  
Use your hands to put a layer of grease on the hinge bolts.

 (c)  
Install the hinge bolts. 1) Put the bolts in the hinge arms. 2) Put four washers on the bolts. 3) Put the bolts through the fittings in the structure. 4) Install, but do not tighten the nuts on the bolts.

 (d)  
Loosen the four bolts that attach the hinge arms to the door.
　
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