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(4)
Replace the faulty components. Do again a leak test until you get a
stable pressure.
(5)
On the panel 21VU release the OXY/CREW SUPPLY pushbutton switch (the OFF legend come on).
5. Close-up
________ Subtask 35-10-00-410-055
A. Put the aircraft back to its initial configuration.
(1)
De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002)
(2)
Make sure that the work area is clean and clear of tool(s) and other items.
(3)
Fully open the valve of the oxygen cylinder valve assembly.
(4)
Close the cover of the oxygen compartment.
(5)
Close the access door 812.
(6)
Remove the access platform(s).
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TASK 35-10-00-790-002
Leakage test of the LP oxygen system for the crew with the VARIAN HELITEST TOOL
WARNING : KEEP ALL HYDROCARBONS (FUELS, LUBRICANTS, ETC.) AWAY FROM ALL SOURCE
_______ OF OXYGEN. OXYGEN BECOMES EXPLOSIVE WHEN IT TOUCHES HYDROCARBONS.
WARNING : CLEAN THE TOOLS AND MAKE SURE YOUR HANDS ARE CLEAN TO PREVENT
_______ CONTAMINATION OF THE OXYGEN SYSTEM.
CAUTION : PUT DRY, CLEAN, METAL OR PLASTIC PLUGS ON ALL PIPES OR UNITS REMOVED
_______ TEMPORARILY. PUT EACH PIPE OR UNIT IN A SEALED VINYL BAG.
1. Reason for the Job
__________________
NOTE : You must do this procedure after the procedure:
____ Leakage Test of the LP Oxygen System for the Crew with the Oxygen Cylinder Source. This procedure lets you find the leakage of a component or part of the crew oxygen system.
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific circuit breaker(s) safety clip(s) No specific access platform 2.00 in. (50.7999 mm)
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied
from the External Power 31-60-00-860-001 EIS Start Procedure 35-11-41-000-001 Removal of the Crew Oxygen-Storage Cylinder (5750HM) 35-11-41-400-001 Installation of the Crew Oxygen-Storage Cylinder
(5750HM) 35-10-00-991-005 Fig. 504
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3. Job Set-up
__________ Subtask 35-10-00-010-057
A. Get access to the Avionics Compartment
(1)
Put an access platform in position at the access door 812.
(2)
Open the access door 812.
(3)
In the avionics compartment, open the cover of the oxygen compartment.
(4)
Close the valve of the oxygen cylinder (5750HM). Subtask 35-10-00-860-055
B. Aircraft Maintenance Configuration
(1)
Energize the aircraft electrical circuits
(Ref. TASK 24-41-00-861-002).
(2)
Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) (Ref. TASK 31-60-00-860-001).
(3)
Make sure that the avionics ventilation operates correctly. Subtask 35-10-00-865-052
C. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU OXYGEN/CREW/OXY/SPLY 1HT HA01
Subtask 35-10-00-860-058
D. Preparation for Installation
(1) Bleed the oxygen system.
(a) On the panel 21VU, push the OXYGEN/CREW SUPPLY pushbutton switch (the OFF legend goes off).
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(b) On one of the oxygen mask stowage boxes:
- operate the PRESS TO TEST AND RESET control slide a sufficient number of times.
(2) Preparation before the test.
(a)
Remove the oxygen cylinder (Ref. TASK 35-11-41-000-001).
(b)
Install and connect the tool cylinder at the position of the oxygen cylinder. The tool cylinder contains a gaseous mixture with 10% helium and 90% nitrogen filled to 127 bars.
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