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 CAUTION: DO NOT ADD THE CHEMICAL PRECHARGE TO THE TOILET TANK IF THE
_______ AIRPLANE WILL BE KEPT WHERE IT IS VERY COLD. THE CHEMICAL PRECHARGE MIXTURE CAN FREEZE AND CAUSE DAMAGE TO THE TOILET WASTE SYSTEM.
 (2)  Method II (Alternative to Method I) - Add the chemical precharge to the waste tank through the toilet bowl.
 (a)  Connect the flush line from the service cart to the rinse fitting on the service panel.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 12-17-61
 ALL  ú ú 03 Page 306 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  
Put 4.5 U.S. gallons of water into the toilet tank.

 (c)  
Disconnect the flush line.

 (d)  
Flush the amount of chemical precharge that is necessary to treat a 13 gallon tank down the toilet.

 H. Put the Airplane Back to Its Usual Condition.
 S 863-014
 (1)  
Close the rinse fitting cap.

 S 213-015

 (2)  
Make sure that the drain valve assembly has no leakage.

 S 863-016

 (3)  
Close the outer cap on the drain valve assembly.

 S 143-017

 (4)
Clean and dry all the service panel components and the door.

 S 863-018

 (5)  
Close the door on the service panel.

　
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