(b)  
Slowly and with much care, push the drain brush into the 4 inch toilet-tank drain tube.

 (c)  
Slowly and with the minimum force necessary, move the drain brush down the drain tube until the blockage is clear.

 (d)  
Flush water into the toilet tank, and make sure the blockage has been fully removed.

 (e)  
Stop the flush water and remove the flexible drain brush.

 (f)  
Use the long handle brush to clean the toilet-tank drain-valve seat inside the toilet tank.

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A 737-300/400/500MAINTENANCE MANUAL
 S 212-037
 (13)
 Do an inspection of the toilet drain valve (AMM 38-32-31/601).

 S 422-038

 (14)
 Install the toilet drain valve (AMM 38-32-31/401).

 S 162-039

 (15)
 If the auxiliary tank does not drain correctly, repeat the above procedure on the auxiliary tank, to clear the 1.5 inch drain tube from the auxiliary tank.

 NOTE: The tank drain valve in the auxiliary tank is the same type
____ as that installed in the toilet tank. The drain outlet in the auxiliary tank has a 4 inch to 1.5 inch adaptor installed.
 S 162-040
 (16)
 If the blockage is in the toilet tank to auxiliary tank tube, the flexible drain brush is to be very carefully inserted into the tube from inside the toilet tank.

 S 162-041

 (17)
 If you cannot free the blockage in the toilet drain tube, you must make an assessment of where the blockage is to be found and replace the drain tube, as applicable.

 NOTE: If the removal of the toilet drain tube is necessary, make
____ sure you take full precautions to prevent blue water contamination of local area. It is recommended to use suction methods to remove as much waste as possible from the drain tube before removal.
 S 162-057
 (18)
 Clean all containinated areas with an approved disinfectant to kill all harmful micro-organisms and remove bad smells.

 (19)
 Install the toilet shroud in the aft lavatory.

 S 862-043

 (20)
 Remove the tag and close the applicable lavatory flush-motor circuit breaker.

 S 412-042
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A
737-300/400/500MAINTENANCE MANUAL
 S 112-058
 (21)
 Do the toilet tank cleaning procedure (AMM 38-32-00/701).

 S 612-044

 (22)
 Do the aft toilet servicing-procedure (AMM 12-17-00/301).

 S 942-045

 (23)
 Remove all tools and equipment from the work area.

 S 412-046

 (24)
 Close the aft toilet service-panel.

 S 412-047

 (25)
 Install the access panel at the rear bulkhead of the aft cargo-compartment equipment-bay.

 (26)
 Close the aft cargo-compartment door (AMM 52-48-41/501).

 S 412-048
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A
737-300/400/500MAINTENANCE MANUAL
 TOILET SYSTEM - ADJUSTMENT/TEST
_______________________________
 1. General
_______
 A. This procedure contains these tasks:
 (1)  Leak Tests:
 (a)  
Toilet Tank Dump Valve

 (b)  
Ball Valve

 (c)  
Service Panel Drain Valve

 (d)  
Flush/Fill Port

 (e)  
Toilet Tank Components and Piping
　
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