DOC AIRBUS | AMM A320FCold Weather Conditions - Put the Oxygen System in Safe Conditions
TASK 12-31-35-660-802-A
Cold Weather Conditions - Put the Oxygen System in Safe Conditions
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 12-31-35-941-051-A
Subtask 12-31-35-020-051-A
[Rev.10 from 2021]
2026.04.02 06:10:34 UTC
Cold Weather Conditions - Put the Oxygen System in Safe Conditions
WARNING:
DO NOT FILL OR REPLACE A CREW OXYGEN CYLINDER OR REPLACE A VALVE ASSEMBLY ON THE CREW OXYGEN SYSTEM WHEN YOU FUEL OR DEFUEL THE AIRCRAFT.
KEEP ALL HYDROCARBONS (FUELS, LUBRICANTS, ETC.) AWAY FROM ALL SOURCES 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 JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 35-00-00-860-001-A | Special Precautions When Working on a Gaseous Oxygen System |
| TASK 35-32-42-000-001-A | Removal of the Portable Oxygen Cylinder |
Subtask 12-31-35-941-051-A
A. Not Applicable
4. ProcedureSubtask 12-31-35-020-051-A
A. Removal of the Portable Oxygen-Cylinder Assembly
(1) If installed, remove the portable oxygen-cylinder assembly when the ambient temperature is not in the below temperature range (Ref. AMM TASK 35-32-42-000-001):
(a) For P/N series 5500/5600 : -51 deg.C (-59.80 deg.F) to +71 deg.C (159.80 deg.F)
(b) For P/N series 3559/3552 : -15 deg.C (5.00 deg.F) to +70 deg.C (158.00 deg.F)
(c) For P/N series 9700 : -15 deg.C (5.00 deg.F) to +71 deg.C (159.80 deg.F)
(d) For P/N series 9800 : -51 deg.C (-59.80 deg.F) to +71 deg.C (159.80 deg.F)
(e) For P/N series AV20145XX/AV20144XX : -20 deg.C (-4.00 deg.F) to +60 deg.C (140.00 deg.F).
Subtask 12-31-35-660-056-A (1) If installed, remove the portable oxygen-cylinder assembly when the ambient temperature is not in the below temperature range (Ref. AMM TASK 35-32-42-000-001):
(a) For P/N series 5500/5600 : -51 deg.C (-59.80 deg.F) to +71 deg.C (159.80 deg.F)
(b) For P/N series 3559/3552 : -15 deg.C (5.00 deg.F) to +70 deg.C (158.00 deg.F)
(c) For P/N series 9700 : -15 deg.C (5.00 deg.F) to +71 deg.C (159.80 deg.F)
(d) For P/N series 9800 : -51 deg.C (-59.80 deg.F) to +71 deg.C (159.80 deg.F)
(e) For P/N series AV20145XX/AV20144XX : -20 deg.C (-4.00 deg.F) to +60 deg.C (140.00 deg.F).
B. Prepare the Closing of the Manual Shutoff Valve(s) of the Crew Oxygen-Storage Cylinder(s) when the Outside Air Temperature (OAT) is Less than or Equal to -15 deg.C (5.00 deg.F).
(1) Obey the special precautions when you do work on a gaseous oxygen system (Ref. AMM TASK 35-00-00-860-001).
Subtask 12-31-35-865-054-A (1) Obey the special precautions when you do work on a gaseous oxygen system (Ref. AMM TASK 35-00-00-860-001).
C. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 12-31-35-660-057-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | OXYGEN/CREW/OXY/SPLY | 1HT | HA01 |
D. Procedure to Close the Manual Shutoff Valve(s) of the Crew Oxygen-Storage Cylinder(s) when the Outside Air Temperature (OAT) is Less than or Equal to -15 deg.C (5.00 deg.F).
(1) Close the manual shutoff valve of the crew oxygen-storage cylinder (5750HM).
(2) Bleed the oxygen system:
(a) For MF10/MF20 oxygen masks:
1 In the cockpit, on the OXYGEN section of overhead panel 21VU, push the CREW SUPPLY pushbutton switch (the OFF legend goes off).
2 On one oxygen-mask stowage box, push the PRESS TO TEST AND RESET control lever.
At the same time, push the PRESS TO TEST/EMERGENCY knob on the mask regulator.
Keep the control lever and the knob pushed for a minimum time of three seconds.
4 In the cockpit, on the OXYGEN section of overhead panel 21VU, release the CREW SUPPLY pushbutton switch (the OFF legend comes ON).
5 In the cockpit, on the OXYGEN section of overhead panel 21VU, put a WARNING NOTICE(S) in position to tell persons not to push the CREW SUPPLY pushbutton switch.
(b) For 174690 oxygen masks:
1 In the cockpit, on the OXYGEN section of overhead panel 21VU, push the CREW SUPPLY pushbutton switch (the OFF legend goes off).
2 On the mask regulator, turn the NORM/100%/EMER knob to the EMER position.
At the same time, push the TEST/RESET knob on the stowage box.
Keep the TEST/RESET knob pushed for a minimum time of three seconds.
5 In the cockpit, on the OXYGEN section of overhead panel 21VU, put a WARNING NOTICE(S) in position to tell persons not to push the CREW SUPPLY pushbutton switch.
Subtask 12-31-35-660-057-B ** ON A/C NOT FOR ALL (1) Close the manual shutoff valve of the crew oxygen-storage cylinder (5750HM).
(2) Bleed the oxygen system:
(a) For MF10/MF20 oxygen masks:
1 In the cockpit, on the OXYGEN section of overhead panel 21VU, push the CREW SUPPLY pushbutton switch (the OFF legend goes off).
2 On one oxygen-mask stowage box, push the PRESS TO TEST AND RESET control lever.
At the same time, push the PRESS TO TEST/EMERGENCY knob on the mask regulator.
Keep the control lever and the knob pushed for a minimum time of three seconds.
NOTE: During this time, the flow rate indicator changes from yellow to black and the volume of the sound of the oxygen flow rate decreases. When the flow rate indicator is black and when you can no longer hear the sound of the oxygen flow rate, release the control lever and the knob.
3 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. 4 In the cockpit, on the OXYGEN section of overhead panel 21VU, release the CREW SUPPLY pushbutton switch (the OFF legend comes ON).
5 In the cockpit, on the OXYGEN section of overhead panel 21VU, put a WARNING NOTICE(S) in position to tell persons not to push the CREW SUPPLY pushbutton switch.
(b) For 174690 oxygen masks:
1 In the cockpit, on the OXYGEN section of overhead panel 21VU, push the CREW SUPPLY pushbutton switch (the OFF legend goes off).
2 On the mask regulator, turn the NORM/100%/EMER knob to the EMER position.
At the same time, push the TEST/RESET knob on the stowage box.
Keep the TEST/RESET knob pushed for a minimum time of three seconds.
NOTE: During this time, the flow rate indicator changes from yellow to black and the volume of the sound of the oxygen flow rate decreases. When the flow rate indicator is black and when you can no longer hear the sound of the oxygen flow rate, release the TEST/RESET knob.
3 On the mask regulator, turn the NORM/100%/EMER knob in the 100% position. NOTE: Make sure that the NORM/100%/EMER knob is not in the EMER position. If it is in the EMER position, there can be a leak of oxygen.
4 In the cockpit, on the OXYGEN section of overhead panel 21VU, release the CREW SUPPLY pushbutton switch (the OFF legend comes ON). 5 In the cockpit, on the OXYGEN section of overhead panel 21VU, put a WARNING NOTICE(S) in position to tell persons not to push the CREW SUPPLY pushbutton switch.
D. Procedure to Close the Manual Shutoff Valves of the Crew Oxygen-Storage Cylinders when the Outside Air Temperature (OAT) is Less than or Equal to -15 deg.C (5.00 deg.F).
(1) Fully close the manual shutoff valves of the two crew-oxygen-storage cylinders (5750HM1) and (5750HM2).
(2) Bleed the oxygen system:
(a) 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).
(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.
(e) On the First-Officer 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.
(h) In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU:
Subtask 12-31-35-865-055-A (1) Fully close the manual shutoff valves of the two crew-oxygen-storage cylinders (5750HM1) and (5750HM2).
(2) Bleed the oxygen system:
(a) 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).
(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.
NOTE: During this time, the flow rate indicator changes from yellow to black and the volume of the sound of the oxygen flow rate decreases.
(c) When the flow rate indicator is black and 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.
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.
1 Make sure that the PRESS TO TEST/EMERGENCY knob is not in the EMERGENCY position. (e) On the First-Officer 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.
NOTE: During this time, the flow rate indicator changes from yellow to black and the volume of the sound of the oxygen flow rate decreases.
(f) When the flow rate indicator is black and 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.
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.
1 Make sure that the PRESS TO TEST/EMERGENCY knob is not in the EMERGENCY position. (h) 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).
- Put a WARNING NOTICE(S) in position to tell persons not to push the CREW SUPPLY pushbutton switch.
E. Open, safety and tag this(these) circuit breaker(s):
| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | OXYGEN/CREW/OXY/SPLY | 1HT | HA01 |