S 983-042

 (3)  
Manually open the toilet drain valve.

 (a)  
Put a torque wrench with a 5/16-inch hexagonal socket on the manual override.

 (b)  
Turn the manual override clockwise approximately 32 turns to fully open the toilet drain valve.

 NOTE: Do not use more than 25 pound-inches.
____
 S 613-043
 (4)  Make sure the toilet tank drains.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (5)  S 983-044Manually close the toilet drain valve. (a) Put a torque wrench with a 5/16-inch hexagonal socket on the manual override. (b) Turn the manual override counter clockwise until the torque gets to 25 in-lbs.
 (6)  S 863-045Remove the DO-NOT-CLOSE tag and close this circuit breaker on the P414 Power Distribution Panel - Left. (a) 414E19 DRAIN VALVE LAV TANKS U-21
 (7)  S 863-046Make sure the toilet drain valve indicator light on the service panel goes out.
 (8)  S 413-047Install the toilet shroud and engage the latches.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 GALLEY DRAIN SYSTEM - SERVICING
_______________________________
 1.  General_______
 A.  This procedure gives the instructions for the removal of blockages from the drain lines for the galley sinks. You can cause a blockage of the drain lines if you put unwanted materials into the system. Make sure that the airplane is in the correct configuration to safely flush the system that drains the sinks.
 B.  The drain lines are tubing that goes from the drain collector box and sink to the drain mast. The location of the drain mast is on the bottom of the fuselage.
 TASK 12-18-02-603-001
 2.  Galley Drain line Servicing___________________________
 A.  Standard Tools and Equipment
 (1) Container (for overflow water)
 B.  Consumable Materials
 (1) B00230 Cleaner - Alkaline (Altrex B)
 C.  References
 (1)
25-31-13/401, Galley Drain Line Strainer

 (2)
38-31-00/201, Waste Water System

 D.  Access
 (1)  Location Zone
 200 Upper Half Fuselage

 E.  Procedure
 S 033-002
 WARNING: DO NOT PERMIT THE CHEMICAL DETERGENTS TO TOUCH YOUR EYES OR
_______ SKIN. THE CHEMICAL DETERGENTS CAN CAUSE INJURY TO PERSONS.
 (1)
Remove the drain line strainer (Ref. 25-31-13/401).

 S 213-007

 (2)
Do a check of the strainer for the drain lines (Ref. 25-31-13/401).

 NOTE:  You can remove the blockage from the drain lines by one or more procedures. The available equipment and the type of blockage will let you make a decision on which procedure is applicable. For drain lines with blockages that are not easy to remove, refer to 38-31-00/201.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (3)  S 213-008Do a check of the drain line between the drain line strainer and the sink drain fitting for blockage.
 (4)  S 163-009Remove all blockage found.
 S 863-010
 (5)  CAUTION: DO NOT USE PRESSURIZED WATER, MECHANICAL TOOLS, OR PUT AN_______ ALKALINE DETERGENT IN DRAIN LINES THAT HAVE A STRAINER. YOU CAN CAUSE DAMAGE TO THE STRAINER. USE THE SECTION OF TUBING BELOW THE STRAINER TO REMOVE THE BLOCKAGE.Put a plug in the drain lines that connect to the blocked drain line.
 NOTE:____ This will prevent water damage to other areas when you apply water that is pressurized.
　
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