(2)
It is not permitted to pressurize the APU fuel-line shroud with a fluid. Use air or nitrogen to pressurize the shroud for the leak test.
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(3) Put the warning notices in position: - on the refuel/defuel control panel 800VU, to tell persons not to refuel the aircraft, - on the FUEL section of the overhead panel 40VU, to tell persons not to operate the fuel system,
- on the APU section of the overhead panel 25VU, to tell persons not to operate the APU.
Subtask 28-22-00-860-050
B. Aircraft Maintenance Configuration
(1)
Open the RH main gear door (Ref. TASK 32-12-00-010-001).
(2)
Make sure that the APU fuel line is filled with fuel (Ref. TASK 28-22-00-710-001).
Subtask 28-22-00-480-051
C. Installation of the Test Equipment
(Ref. Fig. 501/TASK 28-22-00-991-001)
WARNING : DO NOT GET AIRCRAFT FUEL:
_______
-
IN YOUR MOUTH
-
IN YOUR EYES
-ON YOUR SKIN FOR A LONG TIME. AIRCRAFT FUEL IS POISONOUS.
WARNING : DO NOT GET YOUR CLOTHES SOAKED WITH FUEL.
_______
(1)
Clean the component interface and/or the adjacent area.
(2)
Remove the bolt (5) and the washer (4). NOTE : If you find signs of leak-fuel when you disconnect the drain
____ line (2), repair/replace the APU fuel-line components as necessary.
(3)
Loosen the the nut (7) and disconnect the drain line (2) from the union (6).
NOTE : Hold the union (6) with a second wrench.
____
(4) Put a blanking cap on the union (6).
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APU Fuel-Line Shroud - Drain Line Connection
Figure 501/TASK 28-22-00-991-001
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(5) Make sure that the ground air-pressure generator, the valves, the pressure hoses and pressure gages are in correct condition and assemble the items to the correct test configuration.
NOTE : Make sure that the ground air-pressure generator can supply
____ compressed air which is dried, filtered and pressure regulated to 20 psi (1.3789 bar). Make sure that the pressure gages are approved and calibrated for a pressure up to 30 psi (2.0684 bar).
(6) Connect the test equipment to the drain line (2).
4. Procedure
_________
Subtask 28-22-00-790-050
A. Leak Test of the APU Fuel-Line Shroud
(Ref. Fig. 501/TASK 28-22-00-991-001)
(1) Do this test:
-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1.
Make sure that the shut-off - on the pressure gages 1 and 2 you can valves B and C are closed and monitor that the air pressure in the open the shut-off valve A. APU fuel-line shroud increases to 20 Start the ground air-pressure psi (1.3789 bar). generator and slowly increase the pressure to 20 psi (1.3789 bar).
2.
Close the shut-off valve A and - on the pressure gage 2 you can read stop the ground air-pressure that the air pressure in the APU generator. fuel-line shroud remains at 20 psi
(1.3789 bar).
3.
Monitor the pressure gage 2 and - on the pressure gage 2 you can read make sure that the air pressure that the air pressure in the APU in the APU fuel-line shroud fuel-line shroud is 20 psi (1.3789 remains at 20 psi (1.3789 bar) bar) and does not decrease. for 15 minutes.
NOTE : Leaks are not permitted.
____ If the pressure decreases during the 15 minutes, do a leak check with the soap solution. When you find the leak(s), do the repair/replace as necessary.
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-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------After the repair/replacement you must do the complete test again.
4. After 15 minutes, open the - on the pressure gage 2 you can read
shut-off valve C and release the that the air pressure in the APU
air pressure from the APU fuel-line shroud decreases
fuel-line shroud to the ambient completely.
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