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 38-32-00
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A
737-300/400/500MAINTENANCE MANUAL
 (e)  
In airplanes with an auxiliary toilet tank installed: Remove the auxiliary tank drain-valve from the top of the auxiliary tank (AMM 38-32-31/401).

 (f)  
Examine the tank drain valve and the valve seat in the tank, for damage. 1) If you see damage to the valve seat, clean and repair the

 tank as necessary. 2) If the protective rubber boot is damaged, replace the drain valve (AMM 38-32-31/401). 3) If the tank drain valve is unserviceable, repair or replace as necessary.

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

 (h)  
As applicable, install the auxiliary tank drain-valve
 (AMM 38-32-31/401).

 (i)  
Fill the aft toilet system with water until the lavatory bowl is half full with water.

 (j)  
At the aft toilet service-panel, examine the inside of the toilet drain tube to make sure no water flows from the toilet tank and/or the auxiliary tank.

 (k)  
On the aft toilet service-panel, as applicable, do the steps that follow: 1) Install the drain plug, on the service panels without

 levers for the flapper valve. 2) Set the CLOSED lever so the flapper valve is closed, on service panels with OPEN/CLOSE levers. 3) Set the PUSH-TO-OPEN lever so the flapper valve is closed, on service panels with PUSH-TO -OPEN levers.

 (l)  
Close the drain valve assembly on the aft toilet service-panel.

 (m)  
Pull and lock the tank drain-valve handle on the aft toilet service-panel (for example: R.H. AFT TOILET).

 (n)  
Pull and lock the auxiliary-tank drain-valve handle on the aft toilet service-panel. (AUX TOILET TANK DRAIN AND FLUSH ONLY).

 S 216-059
 (19) In the aft cargo-compartment equipment-bay, do a full visual inspection of the components that follow:
 (a)  
The 4 inch toilet-tank drain tube, at these connections: 1) Under the toilet tank(s). 2) The aft toilet service-panel. 3) For installations with more than one lavatory, at the

 junction duct.

 (b)  
For airplanes with auxiliary toilet tanks installed.
 The 1.5 inch auxiliary-tank drain tube(s), at these
 connections:
 1) The underside of the toilet tank(s).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 2) The top of the auxiliary tank. 3) If applicable, the in-line connections. 4) The underside of the auxiliary tank. 5) The junction with the 4 inch toilet drain tube.
 (c)  
The ground flush hose(s), at these connections: 1) The aft toilet service-panel. 2) On the non modular lavatories, under the toilet tank(s). 3) The top of the auxiliary tank.

 (d)  
The auxiliary-tank drain-valve control-cable.

 S 966-060
 (20) If you find a leak on the aft-toilet drain tube(s), do the steps that follow:
 (a)  
If the leak is from a coupling, replace packings as necessary and tighten the coupling to stop the leak.

 (b)  
If the leak is from a damaged or holed drain tube, replace the drain tube.

 S 966-061
 (21)
 If you find a leak on the aft-toilet ground-flush hose(s), tighten the couplings or replace the flush line (AMM 38-32-42/401).

 S 966-062

 (22)
 If you find a damaged drain valve control-cable, do the steps that follow:

 (a)  
If the drain valve control-cable is unserviceable, replace the control cable (AMM 38-32-41/401).

 (b)  
If you find the control cable is installed incorrectly, do the installation and adjustment procedure (AMM 38-32-41/401).

 S 216-063
 (23) At the aft toilet service-panel, do a full visual inspection of the drain valve assembly.
　
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