(b)  
Put your hand on the hose that drains the toilet tank, and feel the vibration of the liquid while it flows.

 S 863-061
 (9)  
After you drain the toilet tank, do the steps to close the toilet drain valve in Manual Operation of the Toilet Drain Valve (AMM 12-17-61/301).

 S 613-063

 (10)
 Flush the toilet tank.

 (a)  
Connect the flush line on the service cart to the rinse fitting on the service panel.

 (b)  
Put a minimum of 7 U.S. gallons of water into the toilet tank with a pump.

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MAINTENANCE MANUAL

 (c)  
Do the steps to open the toilet drain valve in Manual Operation of the Toilet Drain Valve (AMM 12-17-61/301).

 (d)  
Make sure the toilet tank drains: 1) Listen for the liquid flow through the hose that drains the toilet tank.

 2)  Put your hand on the hose that drains the toilet tank to feel the vibration of the liquid while it flows.

 (e)  
Disconnect the line used to flush the toilet tank.

 S 863-064
 (11)
 Push the handle for the toilet drain valve fully in.

 S 213-065

 (12)
 Do the steps to close the toilet drain valve in Manual Operation of the Toilet Drain Valve (AMM 12-17-61/301).

 S 023-066

 (13)
 Disconnect the drain hose for the toilet tank from the drain valve assembly.

 G.  Add Chemical Precharge to the Toilet Tank
 S 613-067
 WARNING: MAKE SURE YOU FOLLOW THE MANUFACTURER'S INSTRUCTIONS WHEN YOU
_______ USE THE CHEMICAL PRECHARGE. THE CHEMICAL PRECHARGE CONTAINS CORROSIVE AND/OR POISONOUS MATERIALS. THESE MATERIALS CAUSE INJURY TO PERSONS OR DAMAGE TO THE AIRPLANE IF YOU DO NOT FOLLOW THE INSTRUCTIONS.
 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 CAN FREEZE AND CAUSE DAMAGE TO THE TOILET WASTE SYSTEM.
 (1)  Method I Procedure (Alternative to Method II) - Add the chemical precharge to the toilet tank through the toilet service panel.
 (a)  
Connect the chemical precharge hose from the service cart to the rinse fitting on the service panel.

 (b)  
Pump 4.5 U.S. gallons of the chemical precharge into the toilet tank.

 (c)  
Disconnect the chemical precharge hose.

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747-400 MAINTENANCE MANUAL
 S 423-060
 (2)  Do the steps to close the fill valve in Manual Operation of the Fill Valve (AMM 12-17-61/301).
 S 613-068
 WARNING: MAKE SURE YOU FOLLOW THE MANUFACTURER'S INSTRUCTIONS WHEN YOU
_______ USE THE CHEMICAL PRECHARGE. THE CHEMICAL PRECHARGE CONTAINS CORROSIVE AND/OR POISONOUS MATERIALS. THESE MATERIALS CAUSE INJURY TO PERSONS OR DAMAGE TO THE AIRPLANE IF YOU DO NOT FOLLOW THE INSTRUCTIONS.
 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.
 (3)  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.

 (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.

 S 423-061
 (4)  Do the steps to close the fill valve in Manual Operation of the Fill Valve (AMM 12-17-61/301).
 H. Put the Airplane Back to Its Usual Condition.
　
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