NOTE:  The cable tension should show the toilet tank drain valve is in the open position.

(b)  
At the aft toilet service panel, perform 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.
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.
(c)  
In the aft lavatory, open the separator in the lavatory bowl and very carefully use a long handle brush to clear possible 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.

(d)  
If the blockage of the toilet drain tube has not cleared, continue with this procedure.

(9)  
In the aft toilet, remove the toilet tank shroud assembly using the procedure to remove the toilet waste tank (AMM 38-32-51).

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

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

(12)
Remove the blockage as follows:

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

(b)  
Slowly and carefully 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.

(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, ensure 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.

(14)
Perform an inspection of the toilet drain valve (AMM 38-32-31).

(15)
Install the toilet drain valve (AMM 38-32-31).

(16)
Clean all contaminated areas with an approved disinfectant to kill all harmful micro-organisms and remove bad smells.

(17)
Install the toilet shroud in the aft lavatory using the procedure to install the toilet waste tank (AMM 38-31-51).

(18)
Remove the DO-NOT-CLOSE tag and close this circuit breaker on the load control center panel, P18:

(a)  Applicable lavatory flush circuit breaker

(19)
Accomplish the toilet tank cleaning procedure (AMM 38-32-0).

500 
May 01/99  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  38-32-0 Page 205 

G.  Return the airplane to its usual condition
(1)  
Accomplish the aft toilet servicing procedure (AMM 12-17-0).

(2)  
Remove all tools and equipment from the work area.

(3)  
Close the aft toilet service panel.

(4)  
Install the access panel at the rear bulkhead of the aft cargo compartment equipment bay.

(5)  
Close the aft cargo compartment door (AMM 52-48-41).

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TOILET SYSTEM - ADJUSTMENT/TEST
1. General
A.  This test is provided to verify toilet component installation. The following procedures check the toilet installation for leaks and verify flushing component operation.
B.  There are three pressure test methods available at the discretion of the operator for testing the toilet system for leaks.
(1)  
By use of the airplane cabin pressurization system paragraph 4. below: applicable to both the FWD and AFT toilet drain caps.

(2)  
By using this Vacuum Test Fixture (F73010-27) paragraph 5. below; applicable to the FWD toilet service panel only.

(3)  
By using this Vacuum Test Fixture (G38005) paragraph 6. below; applicable to both the FWD and AFT toilet service panels with the proper adapter.
　
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