S 162-011
(8)
If the toilet tank has not drained and shows to be blocked, do the steps that follow:
(a) In the electronic-equipment compartment, make sure the toilet-tank drain-valve control-cable is correctly installed. (AMM 38-32-41/401)
NOTE: The cable tension should show the toilet-tank drain
____
valve is in the open position.
(b)
AIRPLANES WITH A TOILET-DRAIN BALL VALVE INSTALLED; Do a visual check of the clevis on the waste drain ball-valve, to make sure the ball valve is in the open position (that is, pulled toward the service panel).
(c)
At the forward toilet service-panel, do these steps: 1) Release and push in the toilet-tank drain-valve handle, to close the toilet-tank drain valve.
2) Pull and push on the toilet-tank drain-valve handle several times quickly, to open and close the toilet-tank drain valve.
3) Pull on the toilet-tank drain-valve handle and lock in the open position.
CAUTION: DO NOT TRY TO CLEAR TOILET TANK BLOCKAGES BY THE USE OF
_______ UNAUTHORIZED SHARP OR POINTED TOOLS. DAMAGE CAN BE CAUSED TO THE PROTECTIVE RUBBER BOOT ON THE DRAIN VALVE AND PREVENT THE CORRECT OPERATION OF THE VALVE.
(d) In the forward lavatory, open the separator in the lavatory bowl and very carefully, use a long handle brush to clear possibly blockages at the drain outlet of the tank.
NOTE: The brush must have a round head and soft bristles, to
____ prevent possible damage to the rubber boot on the drain valve.
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737-300/400/500MAINTENANCE MANUAL
(e) If the blockage of the toilet drain tube is not clear, continue with this procedure.
S 012-012
(9)
In the forward toilet, remove the toilet-tank shroud assembly as given when you do the procedure to remove the toilet waste tank. (AMM 38-32-51/401).
S 162-013
(10)
Use polyethylene sheeting in the forward lavatory area to prevent the possibility of contamination, if toilet waste is spilled.
S 022-014
(11)
Remove the toilet drain valve (AMM 38-32-31/401).
S 162-015
(12)
Remove the blockage as follows:
(a)
Insert the flexible, extendable drain-brush through the tank-drain-valve access hole.
(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.
S 962-049
(13) 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 waste from the drain tube before removal.
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S 212-016
(14)
Do an inspection of the toilet drain valve (AMM 38-32-31/601).
S 412-017
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