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A.  Make sure the applicable FLUSH MOTOR circuit breaker is open on the panel P18.
B.  Remove the toilet shroud to get access to the toilet tank.
C.  Clean the skin of the airplane with solvent in the area of the toilet service panel to remove any oil to ensure the vacuum test fixture does not slip.
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.
WARNING:  HEARING PROTECTION REQUIRED DURING VACUUM PUMP OPERATION.
K. Position vacuum test fixture over toilet service panel and start airflow through evacuator.
WARNING:  IF THE VACUUM IS NOT MADE, THE VACUUM TEST FIXTURE WILL NOT STAY IN ITS POSITION. IF THE VACUUM TEST FIXTURE DROPS, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT MAY OCCUR.
NOTE:  Hold the vacuum test fixture in place at all times until vacuum has been made within the chamber. Vacuum made within the chamber will hold the vacuum test fixture in place.
L.  Regulate the airflow to the evacuator to produce 3 psi on the vacuum gage.
NOTE:  Relief valve will limit vacuum to approximately 4 psi.
M.  Maintain 3 psi vacuum for five minutes. Frequently check through the view port for drain cap leakage. 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 at a vacuum of 3 psi (Ref 38-32-31)
(1)  Remove the vacuum test fixture as follows:
(a)  
Hold the vacuum test fixture.

(b)  
Stop the airflow through the evacuator.

(c)  
Disconnect the shop air.

(d)  
Open the bleed valve until the pressure becomes equal.

(e)  
Remove the vacuum test fixture.

N.  Close the access door for the toilet service panel.
O.  Install the toilet shroud.
P.  Close applicable FLUSH MOTOR circuit breakers on panel P18.
6.  Toilet System Vacuum Leak Test (Fig. 502)
A.  Do this task:
(1)  Toilet Tank Servicing (Ref 12-17-0, MP) but do not add the chemical pre-charge to the toilet tank.
B.  Make sure the applicable FLUSH MOTOR circuit breaker is open on the panel P18.
C.  Clean the skin of the airplane with the solvent in the area of the toilet service panel to make sure there is no oil to prevent the vacuum test fixture from slipping.
500 
38-32-0 Page 504  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/99 

C.  Clean the skin of the airplane with solvent in the area of the toilet service panel to remove any oil which might prevent the vacuum test fixture from holding securely.
D.  If it is necessary to do a leakage test of the toilet tank drain valve from the toilet service panel, do these steps:
(1)  
Make sure that the waste drain valve assembly is open with the cap open.

(2)  
Make sure the handle for the tank drain valves is in the closed position.

(3)  
Fill the toilet tank with water to approximately half full.

NOTE:  If water leaks from the waste drain valve assembly, the toilet tank drain valve is damaged or not correctly engaged.

(4)  
If the toilet tank drain valve leaks, repair or replace the valve (Ref. 38-32-31, RI).

E.  Select the correct adapter so vacuum test fixture fits on the toilet service panel being tested.
NOTE:  The toilet service panels on the airplane have different contours. The correct adapter must be used to get a satisfactory test.
F.  Install the adapter on the vacuum test fixture with high vacuum grease on the surfaces that engage.
G.  Do the leakage test of the waste drain valve assembly on the toilet service panel as follows:
(1)  
Make sure that the waste drain valve assembly is closed with the cap open.

(2)  
Pull the handle for the toilet tank drain valves to let the piping fill with water.

(3)  
Fill the toilet tank with water until the toilet bowl is approximately half full.

NOTE:  The water in the toilet tank will fill the drain tube. If water leaks from the waste drain valve assembly, the waste drain valve assembly is damaged or not correctly engaged.
　
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