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A

747-400 
MAINTENANCE MANUAL 
HINGE 
(REF) SEAL  RETAINER 
DOOR 
HINGE PIN 

B

FUSELAGE
LONGERON

SCREWS AND NUTS AT FRAMES
SCREWS AND NUT PLATES
HINGE
DOOR
C
APU Access Door Installation Figure 401 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

747-400
MAINTENANCE MANUAL

DOOR
(RIGHT SIDE)

B
U-BOLT 
(ADJUSTABLE) 
B 
C 
DOOR 
(LEFT SIDE) 
TRIGGER SLOT  LATCH 
C 
TRIGGER 
LATCH TYPICAL 
D 
WASHERS (AN960D416L) 
(11 ARE NECESSARY 
WITH 1 UNDER THE HEAD 
AND 1 UNDER THE NUT) 
SHIMS 
SPACER BLOCK 
LATCH 
U-BOLT 
0.11 INCH 
MINIMUM 
DOOR 
LATCH 
LATCH 
B-B  C-C 

APU Access Door Installation
Figure 401 (Sheet 3)

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A
747-400
MAINTENANCE MANUAL

DETENT CABLE

APU Access Door Installation

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747-400 MAINTENANCE MANUAL
 b) Remove the hinge pins from the ends of the hinges. c) Remove the hinge pins from the center of the hinges.
 (b)  Remove the hinge screws to remove the door:
 1)  Hold the door while you do these steps. a) Put the hold-open rods in the door. b) Remove the screws that hold the hinges to the fuselage
 (Detail C).
 TASK 52-48-02-404-007
 3.  APU Access Doors Installation (Fig. 401)
_____________________________
 A.  Standard Tools and Equipment
 (1)  
Spring scale that can measure 10 to 30 pounds.

 B.  
Consumable Materials

 (1)  
C00523 Coating - Alodine, Clear, MIL-C-5541

 C.  
References

 (1)  
51-21-04/701, Alodized Surfaces

 (2)  
52-09-00/801, Door Seals

 (3)  
IPC 52-48-02 Fig. 2

 D.  
Access

 (1)  
Location Zone
 317 APU Compartment, LH
 318 APU Compartment, RH

 (2)  
Access panel
 317A Door - APU Access
 318A Door - APU Access

 E.  
Procedure

 S 214-008
 (1)  
Examine the door seal for damage.

 (2)  
Repair the seal if it is necessary (Ref 52-09-00/801).

 S 424-041

 (3)  
If you removed the hinge pins, install the door:

 (a)  
Put the door hinge in the fuselage hinge.

 (b)  
Install the hinge pins in the center of the hinge.

 (c)  
Install the hinge pins in the ends of the hinge.

 (d)  
Hold the door with the hold-open rods.
　
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