B.
Access

 (1)  
Location Zones
 241 Passenger Cabin - Section 44 (Left)
 242 Passenger Cabin - Section 44 (Right)

 C.
Procedure

 S 424-047
 (1)  Install the forward APU flame arrestor in the drain tubing between the coupling nut and the coupling body.
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757 MAINTENANCE MANUAL
 (2)  S 434-048Install one retaining ring on the body ferrule and the other retaining ring on the nut ferrule.
 (3)  S 434-049Install two new O-rings, one on the body ferrule and one on the nut ferrule.
 (4)  S 434-050Connect the retainer halves.
 (5)  S 434-051Install the coupling nut on the coupling body.
 (6)  S 434-092Install lockwire on the coupling nut.
 (7)  S 414-052Install the floor panel (AMM 53-01-01/401).

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 APU SUMP DRAIN VALVE - REMOVAL/INSTALLATION
___________________________________________
 1.  General_______
 A.  The APU sump drain valve is found between the main wheel well doors and is installed on the keel beam.
 TASK 28-25-09-004-028
 2.  Remove the APU Sump Drain Valve (Fig. 401)_______________________________
 A.  References
 (1)  
AMM 32-00-15/201, Landing Gear Door Locks

 (2)  
AMM 32-00-20/201, Landing Gear Downlocks

 B.  
Access

 (1)  
Location Zone
 149 Aft Section of Keel Beam

 C.  
Remove the APU Sump Drain Valve

 S 214-005
 (1)  Make sure the downlocks are installed on the nose and main landing gear (AMM 32-00-20/201).
 S 494-006
 WARNING:_______OBEY THE INSTALLATION PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  
Open the doors for the landing gear and install the door locks (AMM 32-00-15/201).
　
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