S 862-028

 (5)  
Open and tag the applicable lavatory flush motor circuit breaker(s).

 S 682-056

 (6)  
Connect the service cart to the aft toilet service-panel and do the procedure to drain the toilet-tank and the auxiliary tank (AMM 12-17-00/301).

 NOTE: Try to drain the toilet-tank and the auxiliary tank, only.
____ Do not complete a full service of the toilet system.
 (a)  On the aft toilet service-panel, make sure that the toilet-tank drain-valve handle is extended and locked in the open position (FOR EXAMPLE : R.H. AFT TOILET).
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 (b)  On the aft toilet service-panel, make sure that the auxiliary-tank drain-valve handle is extended and locked in the open position. (AUX TOILET TANK DRAIN AND FLUSH ONLY).
 S 212-031
 (7)  
In the aft lavatory, open the separator in the lavatory bowl and look for toilet waste/flushing liquid in the toilet tank.

 S 162-032

 (8)  
If the toilet tank has not drained and shows to be blocked, do the steps that follow:

 (a)  In the aft cargo-compartment equipment-bay, 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)  In the aft cargo-compartment equipment-bay, make sure the auxiliary-tank drain-valve control-cable is correctly installed. (AMM 38-32-41/401)
 NOTE: The cable tension should show the auxiliary-tank drain
____
 valve is in the open position.

 (c)  At the aft toilet service-panel, do these steps:
 1)  Release and push in the toilet-tank drain-valve handle, to close the toilet-tank drain valve. (for example: R.H. AFT TOILET).
 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.
 4)  Release and push in the auxiliary-tank drain-valve handle, to close the auxiliary-tank drain valve. (AUX TOILET TANK DRAIN AND FLUSH ONLY).
 5)  Pull and push on the auxiliary-tank drain-valve handle several times, quickly, to open and close the auxiliary-tank drain valve.
 6)  Pull on the auxiliary-tank drain-valve handle and lock in the open position.
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 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 aft 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.
 (e)  If the blockage of the toilet drain tube is not clear, continue with this procedure.
 S 012-033
 (9)  
In the aft lavatory, do the removal procedure for the toilet-tank shroud assembly, as given when you prepare to remove the toilet waste tank. (AMM 38-32-51/401).

 S 162-034

 (10)
 Use polyethylene sheeting in the aft lavatory area to prevent the possibility of contamination, if toilet waste is spilled.

 S 022-035

 (11)
 Remove the toilet drain valve (AMM 38-32-31/401).

 S 162-036

 (12)
 Remove the blockage as follows:

 (a)  
Insert the flexible, extendable drain-brush through the tank drain-valve access hole.
　
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