(a)  
Make sure no water leaks past the drain line plug out through the waste drain fitting.

(b)  
Connect the lavatory drain coupling to the waste drain fitting on the toilet service panel.

(c)  
To drain the water into the toilet service cart, operate the T-handle on the lavatory drain coupling to remove the drain line plug (T-handle pulled out) from the waste drain fitting.

(2)  
AIRPLANES WITHOUT TOILET DRAIN CAP ASSY P/N 2651-269-( ) OR 2651-232-( ); Do these steps:

(a)  
Make sure no water leaks out past the flapper valve out through the waste drain fitting.

(b)  
Connect a waste drain hose to the waste drain fitting on the toilet service panel and to a toilet service cart.

(c)  
To drain the water into the toilet service cart, operate the control lever on the toilet service panel to open the flapper valve.

T.  Wait for the water to drain completely.
500 
38-32-0 Page 502  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/99 

U.  Do the applicable steps which follow:
(1)  
AIRPLANES WITH TOILET DRAIN CAP ASSY P/N 2651-269-( ) OR 2651-232-( ); Do these steps:

(a)  
Operate the T-handle on the lavatory drain coupling to install the drain line plug into the waste drain fitting (T-handle pushed in).

(b)  
Disconnect the lavatory drain coupling from the waste drain fitting.

(2)  
AIRPLANES WITHOUT TOILET DRAIN CAP ASSY P/N 2651-269-( ) OR 2651-232 ( ); Do these steps:

(a)  
Operate the control lever on the toilet service panel to close the flapper valve.

(b)  
Disconnect the waste drain hose from the waste drain fitting on the toilet service panel.

V.  Close the toilet drain cap on the toilet service panel.
W.  Disconnect the water supply hose from the flush line fitting on the toilet service panel.
X.  Close the access door for the toilet service panel.
Y.  Install the toilet shroud.
Z.  Close applicable FLUSH MOTOR circuit breaker on panel P18.
4.  Test Toilet System Drain Cap for Leaks Using Airplane Pressurization
A.  Do this task:

(1)  Toilet Tank Servicing (Ref 12-17-0, MP) but do not add the chemical precharge to the toilet tank.
B.  Make sure the applicable FLUSH MOTOR circuit breaker is open on the panel P18.
C.  Remove the toilet shroud to get access to the toilet tank.
D.  Open the access door for the toilet service panel.
E.  Make sure the toilet tank drain valve handle on the toilet service panel is in the fully closed position (pushed in).
F.  Make sure the toilet drain cap on the toilet service panel is closed.
G.  Connect the water supply hose from the toilet service cart to the flush line fitting on the toilet service panel.
H.  Pump water into the toilet tank through the flush line fitting until the toilet tank is about  3/4 full.
I.  Pull the toilet tank drain valve handle on the toilet service panel to the fully open position.
J.  Continue to pump water into the toilet tank until the toilet bowl is 1/2 full.
K.  Pressurize the passenger cabin to 3 psi above ambient pressure (Ref 21-31-0 and 05-51-101).
CAUTION:  PRESSURE MORE THAN 19 PSI ABSOLUTE (APPROXIMATELY 4 PSI ABOVE AMBIENT) WILL DAMAGE OXYGEN EQUIPMENT.
L.  Maintain 3 psi pressure for five minutes. Frequently check the drain cap for leaks. If leaks are present, stop test and inspect drain cap and drain cap seal for damage or deterioration. Replace drain cap or drain cap seal as necessary to prevent leakage with a cabin pressure of 3 psi (Ref 38-32-31).
M.  Close the toilet tank drain valve.
N.  Open the toilet drain cap on the toilet service panel.
O.  Make sure no water leaks past the toilet tank drain valve out through the waste drain fitting on the toilet service panel.
P.  Depressurize the airplane cabin.
Q.  Drain and service the toilet tank (Ref 12-17-0, TS).
R.  Close the toilet drain cap on the toilet service panel.
S.  Close the access door for the toilet service panel.
T.  Install the toilet shroud.
U.  Close applicable FLUSH MOTOR circuit breaker on panel P18.
May 01/99 38-32-0 Page 503 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

5. Test Forward Toilet System Drain Cap for Leaks Using Vacuum Test Fixture (Fig. 501)
　
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