E.  Access
(1) 
 Location Zones
103 Forward Lavatory
205 Electronic Equipment Compartment

(2) 
 Access Panels
1104 Forward Toilet Service Panel
1201 E/E Compartment Door

F.  Procedure
(1)  
Open the E/E compartment door for access (AMM 52-48-41).

(2)  
Open the forward toilet service panel.

(3)  
Position the maintenance stand under the E/E compartment and install a strong light source inside the compartment.

(4)  
Open this circuit breaker on the load control center panel, P18, and attach a 
DO-NOT-CLOSE tag:

(a) Applicable lavatory flush motor circuit breaker.

(5)  
Drain the forward toilet system (AMM 12-17-0).

NOTE:  It is only necessary to drain the system. Do not complete the full service procedure.

(6)  
At the forward toilet service panel, perform the following steps:

(a)  
Release and close the tank drain valve handle (FWD TOILET).

NOTE:  Let the handle snap to the closed position to ensure that the drain valve in the toilet tank gets a good seal (closed).

(b)  
Disconnect the service cart toilet drain hose (TOILET DRAIN).

(c)  
Perform a full visual inspection of the service panel drain valve assembly.

(d)  
If you find wear or damage to a toilet service panel component, perform the related maintenance procedure and replace as necessary (AMM 38-32-81).

(e)  
Do not close the drain cap, at the fwd toilet service panel.

(f)  
At the fwd toilet service panel, perform the following applicable checks: 1) Ensure the drain plug is removed on service panels without levers for a flapper valve.

2)  Ensure the OPEN lever is set so the flapper valve is open on service panels with OPEN/CLOSE levers.
(7)  
Reconnect the service cart toilet drain hose to the forward service panel.

WARNING:  DO NOT OVERFILL THE SYSTEM WITH WATER. CONTAMINATION OF ELECTRICAL EQUIPMENT WITH WATER CAN CAUSE SERIOUS DAMAGE TO COMPONENTS AND HAVE AN UNWANTED EFFECT ON THE FLIGHT SAFETY OF THE AIRPLANE.

(8)  
Fill the forward toilet system with water until the lavatory bowl is half full with water (AMM 12-17-0).

(9)  
In the forward lavatory, remove toilet shroud assembly using the removal procedure for the toilet waste tank (AMM 38-32-51).

(10)
In the forward lavatory, perform a full visual inspection of the following components:

(a)  
Toilet tank

(b)  
Drain adapter (floor)

(c)  
Drain valve and gasket seal

(d)  
Toilet flush motor, pump gasket seal and filter assembly

(e)  
Toilet filter and gasket seal

(f)  
Ground flush fitting on the service panel

(11)
If you find the toilet tank is damaged and has a leak, replace the toilet tank (AMM 38-32-51).

(12)
If you find the toilet floor drain adapter is cracked or damaged, replace the adapter.

(13)
If you find a leak in the drain valve gasket on top of the toilet tank, replace the gasket (AMM 38-32-51).

(14)
If you find a leak in the toilet flush motor pump or filter assembly gasket, replace the gasket (AMM 38-32-21, AMM 38-32-22).

(15)
If you find a leak at the ground flush fitting, tighten the coupling(s) or replace the tubing (AMM 38-32-31).

(16)
Disconnect the service cart toilet drain hose from the forward toilet service panel  (TOILET DRAIN).

(17)
Do not close the drain cap, at the forward toilet service panel. 

(18)
On the forward toilet service panel, perform the following steps:

(a)  
Ensure the drain plug is removed on service panels with no levers for a flapper valve.

(b)  
Ensure the OPEN lever is set so the flapper valve is open on service panels with OPEN/CLOSE levers.

(19)
If you see water in the drain tube, perform the following steps:

(a)  
Connect the toilet drain tube from the service cart to the forward toilet service panel (TOILET DRAIN).

(b)  
Pull the tank drain valve handle on the fwd toilet service panel to drain the tank.

(c)  
Remove the toilet tank drain valve from the top of the toilet tank (AMM 38-32-31).

(d)  
Examine the toilet 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 toilet tank as

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