(4)
Connect the electrical connector 50MG-A, 50MG1-A, 50MG2-A 50MG3-A or 50MG4-A to the FCU.
(5)
Make sure that the work area is clean and clear of tool(s) and other items.
(6)
Install the toilet shroud (Ref. TASK 25-45-22-400-001).
(7) Close the lavatory door. Subtask 38-31-00-862-058
B. De-energize the ground service network
(Ref. TASK 24-42-00-862-001).
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TASK 38-31-00-790-002
Leak Test of the Vacuum Toilet System
1. Reason for the Job
__________________
To test the system before and after the removal/installation of components
of the vacuum toilet system.
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific 1 ACCESS PLATFORM 2M (6 FT)
No specific 1 STOPWATCH
9501501-4000 1 LEAK TESTER - VACUUM TOILET SYSTEM
B. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
24-42-00-861-001 Energize the Ground Service Network from the External Power 24-42-00-862-001 De-energize the Ground Service Network Supplied from the External Power
TSM 38-31-00-810-854 Vacuum Pressure of the Vacuum System is Too Low
R 38-31-00-991-010 Fig. 503
R 38-31-00-991-016 Fig. 504
3. Job Set-up
__________
Subtask 38-31-00-860-056
A. Preparation for a Leak Check
(1) Energize the ground service network
(Ref. TASK 24-42-00-861-001)
Subtask 38-31-00-941-061
B. Put an ACCESS PLATFORM 2M (6 FT) in position below the vacuum-system overboard vent.
Subtask 38-31-00-480-054
C. Installation of the test tool LEAK TESTER - VACUUM TOILET SYSTEM (9501501-4000).
WARNING : ALWAYS WEAR RUBBER GLOVES, GOGGLES AND PROTECTIVE CLOTHES WHEN
_______
YOU DO THIS TASK.
R (Ref. Fig. 503/TASK 38-31-00-991-010)
(1)
Clean the component interface and/or the adjacent area. NOTE : Make sure that the Leak Tester is in the correct condition and
____ the date of the calibration is not expired.
(2)
Put the indication unit (P/N 9501501-4100) and the test plug (P/N 9501501-4400) in position in the overboard vent.
NOTE : Make sure that the mark on the test plug reaches the forward
____
edge of the fuselage.
(3)
Make sure that you can clearly read the manometer.
(4)
Tighten the serrated nut of the test plug with your hand to lock the tool in the overboard vent.
(5)
Close the manual ventilation valve of the measuring tool.
R Measuring Tool Figure 503/TASK 38-31-00-991-010
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4. Procedure
_________
Subtask 38-31-00-790-052
A. Leak Check of the Vacuum Toilet System R (Ref. Fig. 504/TASK 38-31-00-991-016)
(1) Do this test before the removal and after the installation of components of the vacuum toilet system.
NOTE : The measured differential pressure values (result) must not be
____ below the limits given in Figure 503. Compare the result of the leak checks recorded before the removal and after the installation of the component. The result (of the test made) after the installation must not be more than 10% below the result (of the test made) before the removal. This is to make sure that the component is correctly installed and does not leak.
NOTE : All values shown in this test are negative pressure.
____
Leak Test
-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. In a lavatory: At the manometer:
-Push and release the toilet
flush switch.
-Use a STOPWATCH and record the - After 30 seconds record the value and
time of the flush cycle. compare it with the calculated value from graph 1.
-After 120 seconds record the value and compare it with the calculated value from graph 2.
At the measuring tool: At the manometer:
-Open the manual ventilation - The pressure is zero.
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