(4)  
Apply a bead of high vacuum grease or sealant putty to the surface of the vacuum test fixture that engaged at the toilet service panel.

(5)  
Make sure that the bleed valve on the vacuum test fixture is closed.

WARNING: HEARING PROTECTION REQUIRED DURING PUMP OPERATION.

(6)  
Lift the vacuum test fixture to the toilet service panel.

(7)  
To start the test, do these steps at the same time:

(a)  
Hold the vacuum test fixture to the toilet service panel.

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.

(b)  
Connect the shop air supply.

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 THE EQUIPMENT CAN OCCUR.

(c)  
Start the airflow through the evacuator.

(d)  
If a vacuum is not possible, or is lower than 3 psi, the system has a leak.

(e)  
Regulate the airflow to the vacuum test fixture to produce 3 psi (6 inches of mercury) on the vacuum gage.

NOTE:  The relief valve will keep the vacuum to a limit of approximately 4 psi.

(f)  
Do these steps: 1) Keep 3 psi of vacuum for 5 minutes. 2) Look through the window of the vacuum test fixture for the leakage at the toilet

service panel.

(g)  
AIRPLANES WITH CAPS ON THE TOILET SERVICE PANEL FLUSH FITTINGS; If there is a leakage from the flush port, replace the cap or the seal for the cap at the toilet service panel.

(h)  
AIRPLANES WITHOUT CAPS ON THE TOILET SERVICE PANEL FLUSH FITTINGS; If there is leakage from the flush port, replace the check valve at the toilet tank.

(i)  
If there is leakage from the cap of the waste drain valve assembly, do these steps: 1) Replace the seal on the waste drain valve assembly if it is damaged. 2) Replace or resurface the seal surface of the waste drain valve assembly if it is

damaged.

(j)  
Remove the vacuum test fixture as follows:
1) Hold the vacuum test fixture.
2) Stop the airflow through the evacuator.
3) Disconnect the shop air.
4) Open the bleed valve until the pressure becomes equal.
5) Remove the vacuum test fixture.

500 
May 01/99  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  38-32-0 Page 505 

H.  Do the leakage test of the cap for the waste drain valve assembly on the toilet service panel as follows:
(1)  
Make sure that the cap for the waste drain valve assembly is closed.

(2)  
Apply a bead of high vacuum grease or sealant putty to the surface of the vacuum test fixture that engages at the toilet service panel.

(3)  
Make sure that the bleed valve on the vacuum test fixture is closed.

(4)  
Lift the vacuum test fixture to the toilet service panel.

(5)  
To start the test, do these steps at the same time:

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.
(a)  
Hold the vacuum test fixture to the toilet service panel.

WARNING:  HEARING PROTECTION REQUIRED DURING VACUUM PUMP OPERATION.

(b)  
Connect the shop air supply.

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 THE EQUIPMENT CAN OCCUR.

(c)  
Start the airflow through the evacuator.

(d)  
If a vacuum is not possible, or is lower than 3 psi, the system has a leak.

(e)  
Regulate the airflow to the vacuum test fixture to produce 3 psi (6 inches of mercury) on the vacuum gage.

NOTE: The relief valve will keep the vacuum to a limit of approximately 4 psi.

(f)  
Do these steps: 1) Keep 3 psi of vacuum for 5 minutes. 2) Look through the window of the vacuum test fixture for the leakage at the toilet

service panel.

(g)  
If there is leakage from the cap of the waste drain valve assembly, do these steps: 1) Replace the seal on the cap of the waste drain valve assembly if it is damaged. 2) Replace or resurface the seal surface of the waste drain valve assembly if it is

damaged.

(h)  
Remove the vacuum test fixture as follows: 1) Hold the vacuum test fixture. 2) Stop the airflow through the evacuator. 3) Disconnect the shop air. 4) Open the bleed valve until the pressure becomes equal. 5) Remove the vacuum test fixture.
　
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