(2)  
The installation of the access door for the APU battery.

 TASK 52-49-04-004-001
 2.  APU Battery Access Door Removal (Fig. 401)_______________________________
 A.  General
 (1)  
There are two alternatives to remove the door.

 (a)  
You can remove the hinge pins to remove the door.

 (b)  
You can remove the bolts that hold the hinge to the structure to remove the door.

 B.  
References

 (1)  
IPC 52-49-04 Fig. 2

 C.  
Access

 (1)  
Location Zone 315 Area Aft of Stabilizer Box Compartment, LH

 (2)  
Access Panel
 315A Door - Access

 D.  
Procedure

 (1)  
Open the door.

 S 024-003

 (2)  
Remove the door.

 (a)  
Remove the bolt that holds the stay brace to the door (Detail B).

 (b)  
Remove the hinge pins to remove the door (ALTERNATIVE).

 S 014-002
 1)  Remove the retainer from the center of the hinge (Detail C).
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A
747-400
MAINTENANCE MANUAL

SEE  A  STA 2648  A  LATCH (2 LOCATIONS) 
SEE  B  A 
DOOR 

STAY BRACE
HINGE
DOOR IN THE CLOSED POSITION A RETAINER SEE C
DOOR IN THE OPEN POSITIONA
APU Battery 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
BOLT
STAY
LATCH BRACE
SHIM
B
A-A
HINGE PINS
RETAINER FWDINBD
C
APU Battery 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
 2) Remove the hinge pins while you hold the door. 3) Remove the door from the airplane.
 (c)  Remove the hinge bolts to remove the door (ALTERNATIVE). 1) Remove the bolts that go through the skin into the nutplates on the hinge half. 2) Remove the bolts that go through the hinge half into the
 nutplates on the structure. 3) Remove the special bolts from the ends of the hinge half. 4) Move the hinge half and the door away from the structure.
 TASK 52-49-04-404-004
 3.  APU Battery Access Door Installation (Fig. 401)____________________________________
 A.  Standard Tools and Equipment
 (1)  
Scale-Spring - 0-15 pound range

 B.  
Consumable Materials

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

 C.  
References

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

 (2)  
IPC 52-49-04 Fig. 2

 D.  
Access

 (1)  
Location Zone 315 Area Aft of Stabilizer Box Compartment, LH

 (2)  
Access Panel
 315A Door - Access

 E.  
Procedure

 S 424-005
 (1)  
Install the door.

 (a)  
Use the hinge pins to install the door if you used them to remove the door. 1) Move the door until the hinge half on the door is in the

 hinge half on the fuselage. 2) Put the long hinge pin in the forward hinge segment. 3) Put the short hinge pin in the aft hinge segment. 4) Install the retainer on the hinge.

 (b)  
Use the hinge bolts to install the door if you used them to remove the door. 1) Move the door until the hinge is in the correct location in
　
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