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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-023
 (8)  
Use the drain valve handle to open and close the ball valve three times.

 S 834-024

 (9)  
With the ball valve fully closed, make sure the distance between the end of the handle and the panel is 2.10 inches.

 F. Put the Airplane Back to its Usual Condition
 S 434-025
 (1)  
Install the nut and cotter pin on the valve arm connection.

 S 434-026

 (2)  
Install the lockwire on the jamnut.

 S 864-027

 (3)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker on P414 Power Distribution Panel - Left.

 (a)  414E19 DRAIN VALVE LAV TANKS U-21
 S 714-028
 (4)  
Do the steps in AMM 12-17-61/301 that drain, rinse and add chemical precharge to the toilet tank.

 (5)
Install the floor panel that covers the ball valve rod assembly.

 S 864-030

 (6)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 S 414-029
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. FREIGHTERS ú

 38-32-72
 ú ú 01 Page 405 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.