Fast Loss of Crew Oxygen

TASK 35-10-00-810-813-A
Fast Loss of Crew Oxygen

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.

WARNING: IF YOU FIND AN OXYGEN LEAK, RELEASE THE OXYGEN/CREW SUPPLY PUSHBUTTON SWITCH (THE OFF LEGEND COMES ON) TO STOP THE OPERATION OF THE OXYGEN DISTRIBUTION SYSTEM. IF THE LEAK CONTINUES, CLOSE ALL THE MANUAL SHUTOFF VALVES OF THE OXYGEN CYLINDERS. MAKE SURE THAT THERE IS A GOOD FLOW OF AIR IN THE AREA OF THE LEAK. OXYGEN CAN CAUSE EXPLOSIVE FIRES. THERE IS A RISK OF INJURY TO PERSONNEL AND DAMAGE TO EQUIPMENT.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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. Possible Causes

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14CCB6)	Testing Medium-Leak Detection - Oxygen System
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Referenced Information

REFERENCE	DESIGNATION
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002	De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 31-60-00-860-001	EIS Start Procedure
AMM 31-60-00-860-002	EIS Stop Procedure
AMM 35-00-00-860-001	Special Precautions When Working on a Gaseous Oxygen System
AMM 35-10-00-790-001	Leak Test of the Crew LP Oxygen-System

3. Fault Confirmation
Subtask 35-10-00-860-060-A

A. Job Set Up
(1) Aircraft Maintenance Configuration
(a) Obey the special precautions when you do work on a gaseous oxygen system AMM 35-00-00-860-001.
(b) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(c) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.

Subtask 35-10-00-865-053-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	OXYGEN/CREW/OXY/SPLY	1HT	HA01

Subtask 35-10-00-700-059-A

C. Test
(1) On the ECAM control panel, push the DOOR key to get the DOOR/OXY page.
(2) Do a check of the oxygen pressure indication(s).

4. Fault Isolation
Subtask 35-10-00-810-080-A

A. If the oxygen pressure indication decreases quickly:
(1) 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).
Put a WARNING NOTICE(S) in position to tell persons not to operate the oxygen system.

(2) In the avionics compartment:
(a) Close the manual shutoff valve(s) of (all) the oxygen cylinder(s).
(b) Put a WARNING NOTICE(S) in position to tell persons not to operate the manual shutoff valve(s).
(3) Do the leakage test of the LP oxygen system for the crew AMM 35-10-00-790-001 to find and repair the leaks as necessary.
(a) If the fault continues:

Do a leak check at the connections of the oxygen cylinder(s) and at the pressure regulator/transmitter(s) with Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) .
If you find a leak, replace the defective component(s) and do the leak check again.
Remove the Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) with a Textile-Lint free Cotton - (Material No.14SBA1) .

5. Close-up
Subtask 35-10-00-860-064-A

A. Put the aircraft back to its initial configuration.
(1) Put the oxygen cylinder(s) in the serviceable condition.

CAUTION: WHEN YOU OPEN THE MANUAL SHUTOFF VALVE ON THE CREW OXYGEN-STORAGE CYLINDER, MAKE SURE THAT:

YOU TURN IT VERY SLOWLY
YOU TURN IT UNTIL IT IS FULLY OPEN.

IF YOU TURN THE MANUAL SHUTOFF VALVE TOO QUICKLY, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT. IF THE MANUAL SHUTOFF VALVE IS NOT FULLY OPEN, THE OXYGEN PRESSURE DATA CAN BE INCORRECT.

(a) Turn the manual shutoff valve(s) of (all) the oxygen cylinder(s) in the fully open position.
(b) In the avionics compartment:
1 Remove the warning notice(s).
(2) In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU:

Release the CREW SUPPLY pushbutton switch (the OFF legend comes on).
Remove the warning notice(s).

(3) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
AMM 31-60-00-860-002.
(4) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.

[Rev.8 from Aug 2018] 2026.04.04 04:33:35 UTC