Bleeding of the Crew Oxygen System (Manual Shutoff Valve(s) of the Crew Oxygen-Storage Cylinder(s) is (are) Open)

TASK 35-10-00-870-802-A
Bleeding of the Crew Oxygen System (Manual Shutoff Valve(s) of the Crew Oxygen-Storage Cylinder(s) is (are) Open)

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.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
812

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 35-00-00-860-001-A	Special Precautions When Working on a Gaseous Oxygen System
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
Crew Oxygen-Storage Cylinder ** ON A/C NOT FOR ALL
Crew Oxygen-Storage Cylinder ** ON A/C NOT FOR ALL
Crew Oxygen System

3. Job Set-up
Subtask 35-10-00-941-051-A

A. Safety Precautions

WARNING: WHEN YOU DO WORK ON THE GASEOUS OXYGEN SYSTEM, MAKE SURE THAT YOU OBEY ALL THE APPLICABLE SAFETY PRECAUTIONS. IF YOU DO NOT OBEY THESE PRECAUTIONS, INJURY TO PERSONS AND/OR DAMAGE TO THE AIRCRAFT CAN OCCUR.

(1) Obey the special precautions when you do work on a gaseous oxygen system (Ref. AMM TASK 35-00-00-860-001).
(2) Make sure that there is a good airflow through the work area.

Subtask 35-10-00-861-053-A

B. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 35-10-00-010-062-A

C. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at access door 812.
(2) Open access door 812 (Ref. AMM TASK 52-41-00-010-002).

Subtask 35-10-00-865-056-A

D. 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 35-10-00-860-070-A ** ON A/C NOT FOR ALL

E. Aircraft Maintenance Configuration

Crew Oxygen-Storage Cylinder ** ON A/C NOT FOR ALL

(1) If the manual shutoff valve (1) of crew oxygen-storage cylinder 5750HM is closed, do as follows:
(a) Open the manual shutoff valve (1) of the crew oxygen-storage cylinder:

CAUTION: TURN THE MANUAL SHUTOFF VALVES VERY SLOWLY ON ALL THE CREW OXYGEN-STORAGE CYLINDERS UNTIL THEY ARE FULLY OPEN. IF YOU TURN THE MANUAL SHUTOFF VALVES TOO QUICKLY, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT.

1 Very slowly open the manual shutoff valve (1) (3 to 4 turns) of crew oxygen-storage cylinder 5750HM.
2 Let the pressure become stable for approximately 90 seconds.

CAUTION: TURN THE HANDVALVES ON ALL OXYGEN BOTTLES UNTIL THEY ARE FULLY OPEN. IF THE HANDVALVES ARE NOT FULLY OPEN BEFORE FLIGHT, IT IS POSSIBLE THAT THE OXYGEN PRESSURE DATA ON THE ECAM DOOR/OXY PAGE WILL NOT BE CORRECT.

3 Fully open the manual shutoff valve (1) of crew oxygen-storage cylinder 5750HM.

Subtask 35-10-00-860-070-B ** ON A/C NOT FOR ALL

E. Aircraft Maintenance Configuration

Crew Oxygen-Storage Cylinder ** ON A/C NOT FOR ALL

(1) If the manual shutoff valves (1) and (2) of crew oxygen-storage cylinders 5750HM1 and 5750HM2 are closed, do as follows:

(a) Slowly and fully open the manual shutoff valves (1) and (2) of crew oxygen-storage cylinders 5750HM1 and 5750HM2.

Subtask 35-10-00-860-070-D ** ON A/C NOT FOR ALL

E. Aircraft Maintenance Configuration

Crew Oxygen-Storage Cylinder ** ON A/C NOT FOR ALL

(1) If the manual shutoff valve (1) of crew oxygen-storage cylinder 5750HM1 is closed, do as follows:

(a) Slowly and fully open the manual shutoff valve (1) of crew oxygen-storage cylinder 5750HM.

4. Procedure
Subtask 35-10-00-870-051-A ** ON A/C NOT FOR ALL

A. Bleeding of the Crew Oxygen System
(1) In the cockpit, on the overhead panel, on the OXYGEN section of panel 21VU:
(a) Push the CREW SUPPLY pushbutton switch (the OFF legend goes off).
(2) On one of the oxygen-mask stowage boxes, push and hold the PRESS TO TEST AND RESET control lever. At the same time, push and hold the PRESS TO TEST/EMERGENCY knob on the mask regulator:
(a) Keep the PRESS TO TEST AND RESET control lever and the PRESS TO TEST/EMERGENCY knob pushed for a minimum of three seconds.
(b) Make sure that you can hear the sound of the oxygen flow.
(c) Release the PRESS TO TEST/EMERGENCY knob.
(d) Release the PRESS TO TEST AND RESET control lever.

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.

(e) Make sure that the PRESS TO TEST/EMERGENCY knob is not in the EMERGENCY position.
(3) In the cockpit, on the overhead panel, on the OXYGEN section of panel 21VU:
(a) Release the CREW SUPPLY pushbutton switch (the OFF legend comes on).
(4) If no other maintenance procedure is necessary after the bleeding of the crew oxygen system, go to the Para. Close-up.

Subtask 35-10-00-870-051-C ** ON A/C NOT FOR ALL

A. Bleeding of the Crew Oxygen System
(1) In the cockpit, on the overhead panel, on the OXYGEN section of panel 21VU:
(a) Push the CREW SUPPLY pushbutton switch (the OFF legend goes off).
(2) FOR [5750HM1] (OXYGEN CYLINDER)
(a) On the CAPT oxygen-mask stowage-box, push and hold the PRESS TO TEST AND RESET control lever. At the same time, push and hold the PRESS TO TEST/EMERGENCY knob on the mask regulator:
1 Keep the PRESS TO TEST AND RESET control lever and the PRESS TO TEST/EMERGENCY knob pushed for a minimum of three seconds.
2 Make sure that you can hear the sound of the oxygen flow.
3 Release the PRESS TO TEST/EMERGENCY knob.
4 Release the PRESS TO TEST AND RESET control lever.

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.

5 Make sure that the PRESS TO TEST/EMERGENCY knob is not in the EMERGENCY position.
(3) FOR [5750HM2] (OXYGEN CYLINDER)
(a) On the F/O oxygen-mask stowage-box, push and hold the PRESS TO TEST AND RESET control lever. At the same time, push and hold the PRESS TO TEST/EMERGENCY knob on the mask regulator:
1 Keep the PRESS TO TEST AND RESET control lever and the PRESS TO TEST/EMERGENCY knob pushed for a minimum of three seconds.
2 Make sure that you can hear the sound of the oxygen flow.
3 Release the PRESS TO TEST/EMERGENCY knob.
4 Release the PRESS TO TEST AND RESET control lever.

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.

5 Make sure that the PRESS TO TEST/EMERGENCY knob is not in the EMERGENCY position.
(4) In the cockpit, on the overhead panel, on the OXYGEN section of panel 21VU:
(a) Release the CREW SUPPLY pushbutton switch (the OFF legend comes on).
(5) If no other maintenance procedure is necessary after the bleeding of the crew oxygen system, go to the Para. Close-up.

5. Close-up
Subtask 35-10-00-860-071-A

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access door 812 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).

Subtask 35-10-00-862-052-A

B. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 01:03:41 UTC