DOC AIRBUS | AMM A320FRemoval of the Oxygen-Mask Stowage-Box
TASK 35-12-41-000-001-A
Removal of the Oxygen-Mask Stowage-Box
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 35-12-41-010-050-A
Subtask 35-12-41-020-059-A
[Rev.10 from 2021]
2026.04.01 01:04:08 UTC
Removal of the Oxygen-Mask Stowage-Box
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 AND CLEAN METAL OR PLASTIC PLUGS ON ALL PIPES OR UNITS THAT YOU REMOVE TEMPORARILY. THEN PUT EACH PIPE OR UNIT IN A SEALED VINYL BAG. IF YOU DO NOT OBEY THESE INSTRUCTIONS, CONTAMINATION OF THE OXYGEN SYSTEM CAN OCCUR.
CAUTION:
BE CAREFUL WHEN YOU DO MAINTENANCE OF THE FULL-FACE/QUICK-DONNING MASK(S). YOU CAN CAUSE DAMAGE TO THIS EQUIPMENT VERY EASILY IF YOU USE TOO MUCH FORCE OR THE INCORRECT CLEANING MATERIALS.
ZONE: 123
ZONE: 125
ZONE: 211
ZONE: 212
FIN: 10RN1
FIN: 10RN2
FIN: 10RN3
FIN: 10RN5 ** ON A/C NOT FOR ALL
FIN: 5774HM ** ON A/C NOT FOR ALL
1. Reason for the JobZONE: 125
ZONE: 211
ZONE: 212
FIN: 10RN1
FIN: 10RN2
FIN: 10RN3
FIN: 10RN5 ** ON A/C NOT FOR ALL
FIN: 5774HM ** ON A/C NOT FOR ALL
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 2M (6 FT) |
| No specific | 1 | BAG - VINYL |
| No specific | 1 | CAP - BLANKING |
| No specific | 1 | PLUG - BLANKING |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 123 | NOSE GEAR WELL |
| 125 | LATERAL AVIONIC COMPARTMENT |
| 211 | COCKPIT |
| 212 | COCKPIT |
| 812 |
| 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 24-42-00-861-001-A | Energize the Ground Service Network from the External Power |
| TASK 25-13-41-000-002-A | Removal of the Sidewall Panels |
| TASK 35-00-00-860-001-A | Special Precautions When Working on a Gaseous Oxygen System |
| TASK 35-12-41-000-002-A | Removal of the Full-Face/Quick-Donning Oxygen-Mask |
| TASK 52-41-00-010-002-A | Open the Avionics Compartment Doors for Access |
Oxygen Mask Stowage-BoxSubtask 35-12-41-010-050-A
A. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) in position at access door 812.
(2) Open access door 812 (Ref. AMM TASK 52-41-00-010-002).
Subtask 35-12-41-860-054-A ** ON A/C NOT FOR ALL (1) Put the ACCESS PLATFORM 2M (6 FT) in position at access door 812.
(2) Open access door 812 (Ref. AMM TASK 52-41-00-010-002).
B. Aircraft Maintenance Configuration
(1) Obey the special precautions when you do work on a gaseous oxygen system (Ref. AMM TASK 35-00-00-860-001).
(2) Energize the Ground Service Network from the External Power (Ref. AMM TASK 24-42-00-861-001)
(3) Fully close the valve of the oxygen storage cylinder (5750HM).
(4) Put a WARNING NOTICE(S) in position to tell persons not to open the valve of the oxygen storage cylinder.
Subtask 35-12-41-870-050-A ** ON A/C NOT FOR ALL (1) Obey the special precautions when you do work on a gaseous oxygen system (Ref. AMM TASK 35-00-00-860-001).
(2) Energize the Ground Service Network from the External Power (Ref. AMM TASK 24-42-00-861-001)
(3) Fully close the valve of the oxygen storage cylinder (5750HM).
(4) Put a WARNING NOTICE(S) in position to tell persons not to open the valve of the oxygen storage cylinder.
C. Bleeding of the oxygen system
(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).
(2) On one 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.
(a) Keep them pushed for a minimum of three seconds.
(5) In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU:
Subtask 35-12-41-860-054-B ** ON A/C NOT FOR ALL (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).
(2) On one 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.
(a) 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 decreases.
(3) When the flow rate indicator is black and when you no longer hear the sound of the oxygen flow: - Release the PRESS TO TEST/EMERGENCY knob.
- Release the PRESS TO TEST AND RESET control lever.
(5) 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.
D. Aircraft Maintenance Configuration
(1) Obey the special precautions when you do work on a gaseous oxygen system (Ref. AMM TASK 35-00-00-860-001).
(2) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(3) Energize the ground service network from the external power (Ref. AMM TASK 24-42-00-861-001).
(4) Fully close the two manual shutoff-valves of the crew oxygen-storage cylinders 5750HM1 and 5750HM2.
(5) Put a WARNING NOTICE(S) in position to tell persons not to open the manual shutoff-valves of the crew oxygen-storage cylinders 5750HM1 and 5750HM2.
Subtask 35-12-41-870-050-C ** ON A/C NOT FOR ALL (1) Obey the special precautions when you do work on a gaseous oxygen system (Ref. AMM TASK 35-00-00-860-001).
(2) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(3) Energize the ground service network from the external power (Ref. AMM TASK 24-42-00-861-001).
(4) Fully close the two manual shutoff-valves of the crew oxygen-storage cylinders 5750HM1 and 5750HM2.
(5) Put a WARNING NOTICE(S) in position to tell persons not to open the manual shutoff-valves of the crew oxygen-storage cylinders 5750HM1 and 5750HM2.
E. Bleeding of the two Oxygen Systems
(1) In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU:
(3) 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.
(a) Keep them pushed for a minimum of three seconds.
(4) 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.
(a) Keep them pushed for a minimum of three seconds.
(5) In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU:
Subtask 35-12-41-865-052-A (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).
(3) 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.
(a) 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 decreases.
(b) When the flow rate indicator is black and when you 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. (4) 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.
(a) 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 decreases.
(b) When the flow rate indicator is black and when you 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. (5) 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.
F. Open, safety and tag this(these) circuit breaker(s):
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | OXYGEN/CREW/OXY/SPLY | 1HT | HA01 |
Subtask 35-12-41-020-059-A
A. Removal of the Oxygen-Mask Stowage Box
(1) If necessary, remove the sidewall panels near the applicable oxygen-mask stowage box (1) (Ref. AMM TASK 25-13-41-000-002).
(3) Disconnect the connector plug (6) that supplies the microphone.
(4) Do not disconnect the connector plug (6) of the oxygen-mask stowage box (1) assembly of the fourth occupant. It has no audio connection that operates.
(5) Put the CAP - BLANKING on the connector plug (6).
(7) Remove and discard the ring (4).
(8) Put the PLUG - BLANKING on the disconnected hose (5) and the union (3).
(9) Put the BAG - VINYL on the end of the hose (5).
(10) Release the latches (2).
(11) Remove the oxygen-mask stowage box (1) from its housing.
Subtask 35-12-41-020-059-B (1) If necessary, remove the sidewall panels near the applicable oxygen-mask stowage box (1) (Ref. AMM TASK 25-13-41-000-002).
NOTE: If the sidewall panel is supplied with a disk stowage box, you can open the disk stowage box to get access to the hose (5) and the connector plug (6) of the oxygen-mask stowage box (1).
(2) If necessary, remove the full-face/quick-donning oxygen-mask (Ref. AMM TASK 35-12-41-000-002). (3) Disconnect the connector plug (6) that supplies the microphone.
(4) Do not disconnect the connector plug (6) of the oxygen-mask stowage box (1) assembly of the fourth occupant. It has no audio connection that operates.
(5) Put the CAP - BLANKING on the connector plug (6).
NOTE: It is not necessary to do this step for the fourth occupant stowage-box.
CAUTION:
USE A SECOND WRENCH TO HOLD THE MATING PARTS WHEN YOU LOOSEN OR TIGHTEN THE TUBE OR HOSE NUTS. IF YOU DO NOT OBEY THIS CAUTION, YOU CAN TWIST OR CAUSE DAMAGE TO THE TUBES OR HOSES.
(6) Disconnect the hose (5). (7) Remove and discard the ring (4).
(8) Put the PLUG - BLANKING on the disconnected hose (5) and the union (3).
(9) Put the BAG - VINYL on the end of the hose (5).
(10) Release the latches (2).
(11) Remove the oxygen-mask stowage box (1) from its housing.
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