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A 747-400 MAINTENANCE MANUAL
 (4)  S 218-005Visually examine the threads in the gas generator case to make sure they do not have damage. (a) If it is necessary, use steps 2 and 3 to repair the threads in the gas generator case.
 (5)  S 418-007Do this task: "Combustion Chamber Drain Valve Installation" (Ref 49-16-01/401).

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747-400 MAINTENANCE MANUAL
 APU DRAIN MAST - REMOVAL/INSTALLATION
_____________________________________
 1.  General_______
 A.  This procedure contains the removal and the installation tasks for the APU drain mast.
 B.  The fuel mast assembly is referred to as the APU drain mast.
 C.  The APU drain mast is installed on the side of the fuselage. You can get access to the drain mast fasteners through the compartment that is forward of the APU compartment firewall.
 TASK 49-16-03-004-001
 2.  APU Drain Mast Removal (Fig. 401)______________________
 A.  References
 (1)  
IPC 49-16-00 Fig. 1

 B.  
Access

 (1)  
Location Zone 316 Area Aft of Stabilizer Box Compartment, RH

 (2)  
Access Panel
 315AL Access Door

 C.  
Procedure

 S 864-002
 (1)  
Make sure the APU control switch on the P5 panel is OFF and attach a DO-NOT-OPERATE tag.

 S 864-003

 (2)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Supply Panel
 1) 6K18 APU ALTN CONT

 (b)  
P83 Panel, E8 Aft Equipment Center
 1) APU PRIMARY CONT

 S 014-004
 (3)  
Open the access door 315AL to get access to the area aft of the stabilizer box compartment.

 S 024-005

 (4)  
Remove the APU drain mast:

 (a)  
Disconnect the drain lines from the drain mast fittings.

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747-400
MAINTENANCE MANUAL

SEE A
APU DRAIN MAST SEE B
APU COMPARTMENT FIREWALL
____NOTE:  ADHESIVE IS APPLIED BELOW THE FLANGE TO SHAPE THE FLANGE TO THE SKIN CONTOUR  FITTINGS, 90` DRAIN MAST 
SEALANT  A  ACCESS DOOR, 315AL 
1. BOLT 2. COLLER (10 LOCATIONS) 
3. APU DRAIN MAST
B 
Figure 401 APU Drain Mast Installation 

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747-400 MAINTENANCE MANUAL
 (b)  
Install caps on the drain lines to prevent contamination.

 (c)  
Remove the bolts (1) and the collars (2) that attach the drain mast (3) to the fuselage.

 (d)  
Remove the drain mast (3).

 S 164-008
 (5)  
Clean the drain mast and the skin surface:

 (a)
Clean the parting agent from the skin surface.

 NOTE: The parting agent is applied to the skin surface to
____ permit an easy separation of the adhesive from the skin.
 (b)  If the same drain mast is to be installed, remove the adhesive from the flange and clean the flange.
 NOTE: The adhesive is applied between the drain mast and
____ the skin to make a shim. This shim is for a contour difference between the drain mast and the skin.
　
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