B.  
Consumable Materials

 (1)  
B00722 Solvent - Petroleum, AMS3160 (Fed. Spec. P-D-680)

 (2)  
G01043 Cloth - Lintfree

 C.  
References

 (1)  
49-16-01/401, Combustion Chamber Drain Valve

 (2)  
IPC 49-16-01 Fig. 1

 D.  
Access

 (1)  
Location Zone 317 APU Compartment-Bottom of APU Engine Case and Aft of Accessory Gearbox, LH

 318  APU Compartment-Bottom of APU Engine Case and Aft of Accessory Gearbox, RH

 (2)  
Access Panel
 317AL APU Access Door
 318AR APU Access Door

 E.  
Procedure

 S 017-002
 (1)  
Do this task: "Combustion Chamber Drain Valve Removal" (Ref 49-16-01/401).

 S 117-003

 (2)  
Clean the drain valve for the combustion chamber:

 (a)
Clean all the parts with the petroleum solvent.

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 49-16-01
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 (b)  Dry the parts with the compressed air and the clean, lintfree cloths.
 S 417-004
 (3)  Do this task: "Combustion Chamber Drain Valve Installation" (Ref 49-16-01/401).
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 COMBUSTION CHAMBER DRAIN VALVE - REPAIRS
________________________________________
 1.  General
_______
 A.  This procedure contains a task to do easy repairs to the drain valve for the combustion chamber. The repair of the drain valve components includes the removal of small surface defects. These surface defects include nicks, burrs, scratches, scoring, and gouges.
 B.  The drain valve for the combustion chamber is on the bottom of the gas generator case. The drain valve connects to the drain system interface with a drain line. A spring in the drain valve lets the fuel in the combustion chamber drain during the stopped conditions.
 C.  You can get access to the drain valve for the combustion chamber through the APU access doors.
 TASK 49-16-01-308-001
 2.  Combustion Chamber Drain Valve Repair
_____________________________________
 A.  Consumable Materials
 (1)  
G02084 Cloth - Crocus, P-C-458 Class I

 B.  
References

 (1)  
49-16-01/401, Combustion Chamber Drain Valve

 (2)  
IPC 49-16-01 Fig. 1

 C.  
Access

 (1)  
Location Zone 317 APU Compartment-Six O'Clock Position on Gas Generator Case, LH

 318  APU Compartment-Six O'Clock Position on Gas Generator Case, RH

 (2)  
Access Panel
 317AL APU Access Door
 318AR APU Access Door

 D.  
Procedure

 S 018-002
 (1)  
Do this task: "Combustion Chamber Drain Valve Removal" (Ref 49-16-01/401).

 S 328-003

 (2)  
Repair the small defects in the drain valve:

 (a)  
Use a fine stone and a crocus cloth to do a blend repair of the small surface defects.

 (b)  
Make sure you remove all the sharp edges and the high points.

 S 328-004
 (3)  
Repair the damaged threads on the adapter:

 (a)  
Repair the damaged thread with an applicable swiss file.

 (b)  
If it is necessary, you can chase the threads with an applicable die to repair them more.

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