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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 E. Access
 (1)  
Location Zones 124 Area Below Forward Cargo Container Compartment, Right 224 Upper Deck Crew Rest Body Sta 385 to 632, Right

 (2)  
Access Panel
 125A Service Panel, Toilet Drain

 F. Procedure
 S 615-046
 (1)  
Do the steps in AMM 12-17-61/301 to drain, rinse and add the chemical precharge to the toilet tank but do not disconnect the service cart rinse line and drain line.

 S 865-047

 (2)  
After 5 minutes, operate the lever to open the inner door and drain the chemical precharge.

 S 865-050

 (3)  
Make sure the drain valve handle is closed

 S 865-048

 (4)  
Disconnect the service cart drain line and close the waste drain cap.

 S 865-049

 (5)  
Read the quantity indicator for the rinse line, set the indicator to zero or write the initial quantity of the indicator.

 S 865-051

 (6)  
Add 4 to 5 gallons of water or chemical precharge to the toilet tank.

 S 865-052

 (7)  
Add approximately 2 tablespoons of bicarbonate of soda to the toilet bowl.

 NOTE: If the local water or precharge chemical has sufficient
____
 conductivity this step is not necessary.

 S 865-059
 (8)  Make sure these circuit breakers on P414 Power Distribution Panel -Left are closed:
 (a)  
414E19 DRAIN VALVE LAV TANKS U-21

 (b)  
414C15 LAV LIGHTS GHB

 (c)  
414F23 FILL CONTROL LAV TANKS

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-053
 (9)  Do these steps approximately 5 times:
 (a)  
Push the flush switch.

 (b)  
Make sure the inside of the toilet bowl is fully wetted by the toilet flush fluid.

 (c)  
Make sure the bicarbonate of soda is fully disolved in the toilet flush fluid.

 S 615-055
 CAUTION: DO NOT PUT MORE THAN 12 TOTAL GALLONS OF FLUID INTO THE TOILET
_______ TANK. IF MORE THAN 12 GALLONS OF FLUID IS ADDED TO THE TOILET TANK, THE TOILET TANK WILL BE OVERFILLED WHICH CAN DAMAGE THE AIRPLANE.
 (10) Fill the toilet tank with fluid until the flow automatically stops.
 NOTE: Do not use more than 12 total gallons of fluid.
____
 (a)  If the rinse fill valve does not shutoff automatically, do the troubleshooting task, Toilet Bowl Chemical Fluid Missing, from Block 4 (FIM 38-30-00/101, Figure 103).
 S 975-056
 (11)
 Read and then write the quantity indicator for the rinse line.

 S 715-057

 (12)
 Make sure the total quantity of fluid is between 6 and 10 gallons.

 (a)  If the total quantity is more than 10 gallons, do the troubleshooting task, Toilet Bowl Chemical Fluid Missing, from Block 6 (FIM 38-30-00/100, Figure 103).
 S 615-058
 (13) Do the steps in AMM 12-17-61/301 to drain the toilet tank and add the chemical precharge.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 TOILET FLUSH TIMER - REMOVAL/INSTALLATION
_________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task removes the toilet flush timer. The second task installs the toilet flush timer.
　
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