W DOC AIRBUS | TSM A320F

Oxygen Cylinder Valve Closing not Possible

TASK 35-10-00-810-808-A
Oxygen Cylinder Valve Closing not Possible

1. Possible Causes
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
HOSE - BLEED
No specific
1
VALVE - BLEED
110111-03
1
COUPLING-OXYGEN QUICK DISCONNECT
OR
OR
802857-01
1
COUPLING
98D35208729000
1
TOOL-DPRSS,TEST O2
 B. Referenced Information
REFERENCE
DESIGNATION
AMM 35-11-41-000-001
Removal of the Crew Oxygen-Storage Cylinder
AMM 35-11-41-000-802
Removal of the Crew Oxygen-Storage Cylinders
AMM 35-11-41-400-001
Installation of the Crew Oxygen-Storage Cylinder
AMM 35-11-41-400-802
Installation of the Crew Oxygen-Storage Cylinders
3. Fault Confirmation
Subtask 35-10-00-710-057-A
A. Test
Not applicable, the fault is evident.
4. Fault Isolation
Subtask 35-10-00-810-057-A ** ON A/C NOT FOR ALL
A. If the test confirms the fault:
Subtask 35-10-00-810-057-B ** ON A/C NOT FOR ALL
A. If the test confirms the fault:
   (1) Make sure that there is sufficient airflow in the work area. This is to prevent a high oxygen concentration that can cause explosive fires.
   (2) Bleed the applicable oxygen cylinder(s) 5750HM1(5750HM2) as follows:
     (a) In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU:
  • Make sure that the CREW SUPPLY pushbutton switch is released (OFF legend on).
     (b) On the Captain oxygen-mask stowage box, push and hold the PRESS TO TEST AND RESET control button.
At the same time, push and hold the PRESS TO TEST/EMERGENCY knob on the mask regulator.
       1 Keep them pushed for a minimum of three seconds.
       2 When you can no longer hear the sound of the oxygen flow:
  • Release the PRESS TO TEST/EMERGENCY knob.
  • Release the PRESS TO TEST AND RESET control button.
       3 Position of the PRESS TO TEST/EMERGENCY knob:
WARNING: MAKE SURE THAT THE PRESS TO TEST/EMERGENCY KNOB IS NOT IN THE EMERGENCY POSITION. IF IT IS IN THE EMERGENCY POSITION, THERE CAN BE A LEAK OF OXYGEN.
         a Make sure that the PRESS TO TEST/EMERGENCY knob is not in the emergency position.
     (c) Do the above bleeding again at the F/O oxygen-mask stowage box.
     (d) Assemble the tools.
NOTE: As an alternative, you can use one of these two assemblies.
       1 First tool assembly:
         a Get a 98D35208729000 TOOL-DPRSS,TEST O2 and make sure that its bleed valve is closed.
         b Connect a HOSE - BLEED that has a minimum length of 40 m (131.24 ft.) to the 98D35208729000 TOOL-DPRSS,TEST O2.
         c Put the other end of the HOSE - BLEED far away from the aicraft.
         d Tell all persons not to stay:
  • In the aircraft, and
  • In a 200 m (656.18 ft.) radius area around the bleeding area.
         e Remove the blanking cap from the applicable oxygen-system test-port 5755HM1(5755HM2).
         f Connect the 98D35208729000 TOOL-DPRSS,TEST O2 to the applicable oxygen-system test-port 5755HM1(5755HM2).
       2 Second tool assembly:
         a Get a HOSE - BLEED that has a length of approximately 1 m (3.28 ft.).
         b Connect a VALVE - BLEED on one end of this HOSE - BLEED.
         c Make sure that the VALVE - BLEED is closed.
         d Connect a 110111-03 COUPLING-OXYGEN QUICK DISCONNECT802857-01 COUPLING or equivalent on the other end of the HOSE - BLEED.
         e Connect a HOSE - BLEED that has a minimum length of 40 m (131.24 ft.) to the VALVE - BLEED.
         f Put the other end of the HOSE - BLEED far away from the aicraft.
         g Remove the blanking cap from the applicable oxygen-system test-port 5755HM1(5755HM2).
         h Tell all persons not to stay:
  • In the aircraft, and
  • In a 200 m (656.18 ft.) radius area around the bleeding area.
         i Connect the 110111-03 COUPLING-OXYGEN QUICK DISCONNECT802857-01 COUPLING or equivalent to the applicable oxygen-system test port 5755HM1(5755HM2).
     (e) In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU:
  • Push the CREW SUPPLY pushbutton switch (the OFF legend goes off).
     (f) Open the VALVE - BLEED or the bleed valve of the 98D35208729000 TOOL-DPRSS,TEST O2.
     (g) Keep the bleed valve open until you cannot hear the sound of the oxygen flow.
     (h) When you cannot hear the sound of the oxygen flow:
  • Make sure that the pressure gage(s) on the applicable oxygen cylinder(s) 5750HM1(5750HM2) show(s) 0 psi (0.00 bar).
  • Remove the tool assembly from the applicable oxygen-system test-port 5755HM1(5755HM2).
     (i) Disassemble the tool assembly.
     (j) Put the blanking cap on the applicable oxygen-system test-port 5755HM1(5755HM2).
   (3) Put a label on the defective oxygen cylinder(s) to tell persons that it is (they are) unserviceable.
   (4) Replace the applicable OXYGEN CYLINDER [5750HM1] and/or OXYGEN CYLINDER [5750HM2] AMM 35-11-41-000-802 AMM 35-11-41-400-802.
[Rev.8 from Aug 2018] 2026.04.04 04:33:35 UTC
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