Installation of the Oxygen-Mask Stowage-Box

TASK 35-12-41-400-001-A
Installation 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.

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

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 Job
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	AR	BAG - VINYL
No specific	1	PLUG - BLANKING
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 180 and 130 lbf.in (2.03 and 1.47 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14CCB6)	Testing Medium-Leak Detection - Oxygen System

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
123	NOSE GEAR WELL
125	LATERAL AVIONIC COMPARTMENT
211	COCKPIT
212	COCKPIT
812

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	RING	AIPC 35-12-01-04-010
4	RING	AIPC 35-12-81-04-010

E. 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 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 25-13-41-400-002-A	Installation of the Sidewall Panels
TASK 35-00-00-860-001-A	Special Precautions When Working on a Gaseous Oxygen System
TASK 35-12-41-400-002-A	Installation of the Full-Face/Quick-donning Oxygen-Mask
TASK 35-12-41-710-001-A	Operational Check of Flight Crew Oxygen System
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
Oxygen Mask Stowage-Box

3. Job Set-up
Subtask 35-12-41-860-055-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at the access door 812.
(2) Open the access door 812.
(3) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(4) Make sure that the WARNING NOTICE(S) which tells persons not to open the valve of the oxygen cylinder assembly is in position.
(5) Make sure that the parts retained from the removed component are clean and in the correct condition.

Subtask 35-12-41-860-055-B ** ON A/C NOT FOR ALL

A. 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) In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU:

Make sure that the WARNING NOTICE(S) is in position to tell persons not to push the CREW SUPPLY pushbutton switch.

(3) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at access door 812.
(4) Open access door 812.
(5) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(6) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(7) Make sure that the WARNING NOTICE(S) is in position to tell persons not to open the valves of the oxygen storage-cylinders 5750HM1 and 5750HM2.
(8) Make sure that the parts retained from the removed component are clean and in the correct condition.

Subtask 35-12-41-865-053-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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

4. Procedure
Subtask 35-12-41-420-056-A

A. Installation of the Oxygen-Mask Stowage Box
(1) Install the oxygen-mask stowage box (1) in its housing.
(2) Lock the latches (2).
(3) Remove the BAG - VINYL from the end of the hose (5).
(4) Remove the PLUG - BLANKING from the hose (5) and the union (3).
(5) Install the ring (4) as follows:

CAUTION: YOU MUST INSTALL A NEW RING FOR THE FLARED TUBE EACH TIME YOU CONNECT THE LINE. THIS WILL PREVENT OXYGEN LEAKS.

CAUTION: MAKE SURE THAT THE NEW RING FOR THE FLARED TUBE IS CORRECTLY INSTALLED. THIS WILL PREVENT OXYGEN LEAKS.

(a) Install a new AIPC 35-12-01-04-010 RING (4) or AIPC 35-12-81-04-010 RING (4) on the union (3).
(6) Install the hose (5) on the union (3).

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.

(7) Use a second wrench to hold the union (3) when you torque the nut of the hose (5).
(a) TORQUE the nut of the hose (5) to between 180 and 130 lbf.in (2.03 and 1.47 m.daN )

.
(8) Remove the PLUG - BLANKING from the connector plug (6) and the receptacle (7).

NOTE: It is not necessary to do this step for the fourth occupant stowage-box.

(9) Connect the connector plug (6) to the receptacle (7).

NOTE: It is not necessary to do this step for the fourth occupant stowage-box.

(10) If the full-face/quick-donning oxygen-mask is removed, install the full-face/quick-donning oxygen-mask (Ref. AMM TASK 35-12-41-400-002).
(11) Do a check of the PRESS TO TEST/EMERGENCY knob as follows:

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.

Subtask 35-12-41-420-056-B

DELETED

Subtask 35-12-41-865-063-A

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

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

Subtask 35-12-41-790-050-A ** ON A/C NOT FOR ALL

C. Leak test

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.

(1) Apply a layer of Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) to the mechanical connection.
(2) Very slowly open the valve of the cylinder 3 to 4 turns.
(3) Let the pressure become stable for approximately 90 seconds.
(4) Fully open the valve of the oxygen cylinder.
(5) On panel 21VU:

Push the OXYGEN/CREW SUPPLY pushbutton switch. The OFF legend goes off.

(6) Make sure that there are no leaks on the connection.
(7) Remove the Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) .
(8) On panel 21VU:

Release the OXYGEN/CREW SUPPLY pushbutton switch. The OFF legend comes on.

(9) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(10) If it is necessary install the sidewall panel on the applicable console (Ref. AMM TASK 25-13-41-400-002).

Subtask 35-12-41-790-050-B ** ON A/C NOT FOR ALL

C. Leak test

(1) Apply a layer of Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) to the mechanical connection.
(2) Turn the valve of the cylinder (5750 HM) very slowly until it is fully open.
(3) On panel 21VU:

Push the OXYGEN/CREW SUPPLY pushbutton switch. The OFF legend goes off.

(4) Make sure that there are no leaks on the connection.
(5) Remove the Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) .
(6) On panel 21VU:

Release the OXYGEN/CREW SUPPLY pushbutton switch. The OFF legend comes on.

(7) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(8) If it is necessary install the sidewall panel on the applicable console (Ref. AMM TASK 25-13-41-400-002).

Subtask 35-12-41-790-050-C ** ON A/C NOT FOR ALL

C. Leak Test

(1) Apply a layer of Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) to the mechanical connection(s) between the line (5) and the union (3).
(2) Turn the valve of the two oxygen-cylinders (5750HM1 and 5750HM2) very slowly until it is fully open.
(3) 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).

(4) Make sure that there are no leaks at the mechanical connection(s).
(5) Remove the Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) .
(6) At the oxygen-mask stowage box(es) that you installed:

Do the operational test of the full-face/quick-donning oxygen mask (Ref. AMM TASK 35-12-41-710-001).

(7) 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).

5. Close-up
Subtask 35-12-41-860-056-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the valve of the oxygen cylinder (5750HM) is open.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the WARNING NOTICE(S).
(4) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

Subtask 35-12-41-860-056-B ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) If removed, install the sidewall panel near the applicable stowage box (1) (Ref. AMM TASK 25-13-41-400-002).
(2) Make sure that the two manual-shutoff valves of the crew oxygen-storage cylinders 5750HM1 and 5750HM2 are fully open.
(3) In the avionics compartment:

Remove the WARNING NOTICE(S).

(4) Make sure that the work area is clean and clear of tools and other items.
(5) In the cockpit, on the CREW SUPPLY pushbutton switch:

Remove the WARNING NOTICE(S).

(6) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).
(7) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 35-12-41-410-051-A

B. Close Access
(1) Close access door 812 (Ref. AMM TASK 52-41-00-410-002).
(2) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 12:47:28 UTC