Installation of the Oxygen Distribution Manifold

TASK 35-12-81-400-801-A
Installation of the Oxygen Distribution Manifold

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 VERY CAREFUL WHEN YOU DO WORK ON OR NEAR THE AIR-CONDITIONING DUCTS. THE DUCTS ARE MADE OF THIN MATERIAL AND YOU CAN EASILY BREAK THEM.

ZONE: 125
FIN: 5753HM ** ON A/C NOT FOR ALL
FIN: 5753HM1 ** ON A/C NOT FOR ALL
FIN: 5753HM2 ** 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 3M (10 FT)- ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 20.3 and 14.6 m.N (14.97 and 10.77 lbf.ft )
FOR [5753HM1] (MANIFOLD DISTRIBUTION)
No specific	Torque wrench: range to between 20.3 and 14.6 m.N (14.97 and 10.77 lbf.ft )
FOR [5753HM2] (MANIFOLD DISTRIBUTION)
No specific	Torque wrench: range to between 20.3 and 14.6 m.N (14.97 and 10.77 lbf.ft )

B. Consumable Materials

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

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
125	LATERAL AVIONIC COMPARTMENT
812

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
9	RING	AIPC 35-12-01-01-010
9	RING	AIPC 35-12-81-01-010
FOR [5753HM1] (MANIFOLD DISTRIBUTION)
9	RING	AIPC 35-12-81-09-010
9	RING	AIPC 35-12-81-09-015
FOR [5753HM2] (MANIFOLD DISTRIBUTION)
9	RING	AIPC 35-12-81-11-010

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
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 35-12-00-710-001-A	Functional Check of Low Pressure Switch
TASK 35-13-14-400-001-A	Installation of the Low-Pressure Oxygen Pressure-Switch
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
Oxygen Distribution Manifold ** ON A/C NOT FOR ALL
Oxygen Distribution Manifold ** ON A/C NOT FOR ALL
FOR [5753HM1] (MANIFOLD DISTRIBUTION)
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
TASK 35-13-14-400-802-A	Installation of the Low-Pressure Oxygen Pressure-Switches
FOR [5753HM2] (MANIFOLD DISTRIBUTION)
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
TASK 35-13-14-400-802-A	Installation of the Low-Pressure Oxygen Pressure-Switches

3. Job Set-up
Subtask 35-12-81-941-053-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 the gaseous oxygen system (Ref. AMM TASK 35-00-00-860-001).
(2) Make sure that there is good airflow in the work area.

Subtask 35-12-81-861-051-A

B. Make sure that the aircraft electrical circuits are energized.
(Ref. AMM TASK 24-41-00-861-002).

Subtask 35-12-81-010-051-A

C. Get Access
(1) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position at access door 812.
(2) Make sure that access door 812 is open (Ref. AMM TASK 52-41-00-010-002).

Subtask 35-12-81-860-050-A ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) In the cockpit, on the overhead panel, on the OXYGEN section of panel 21VU:
(a) Make sure that the CREW SUPPLY pushbutton switch is released (the OFF legend is on).
(2) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to open the manual shutoff valve of the crew oxygen-storage cylinder (5750HM).
(3) Make sure that the manual shutoff valve of the crew oxygen-storage cylinder (5750HM) is fully closed.

Subtask 35-12-81-860-050-B ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) In the cockpit, on the overhead panel, on the OXYGEN section of panel 21VU:
(a) Make sure that the CREW SUPPLY pushbutton switch is released (the OFF legend is on).
(2) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to open the manual shutoff valves of the crew oxygen-storage cylinders (5750HM1 and 5750HM2).
(3) Make sure that the manual shutoff valves of the crew oxygen-storage cylinders (5750HM1 and 5750HM2) are fully closed.

Subtask 35-12-81-865-050-A

E. 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 35-12-81-400-050-A ** ON A/C NOT FOR ALL

A. Installation of the Oxygen Distribution Manifold
(1) Do a visual inspection of the component interfaces and the adjacent area.
(2) Clean the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Remove the oxygen distribution manifold (1) from the BAG - VINYL.
(5) Put the oxygen distribution manifold (1) in position on its support (4).
(6) Install the washers (3) and the bolts (2).
(7) Tighten the bolts (2).
(8) Remove the BAG-VINYL and then the PLUG-BLANKING, APPROVED FOR USE WITH OXYGEN from each disconnected line end.
(9) Install the new AIPC 35-12-01-01-010 RING (9) or AIPC 35-12-81-01-010 RING (9) on the oxygen distribution manifold (1).
(10) Make sure that the rings (9) stay in the correct position on the oxygen distribution manifold (1).
(11) Connect the oxygen inlet port (5) and the oxygen outlet port (7) to the oxygen distribution manifold (1).
(12) TORQUE the coupling nuts (6) and (8) to between 20.3 and 14.6 m.N (14.97 and 10.77 lbf.ft )

.
(13) Put a red paint mark on the connection between:

The oxygen distribution manifold (1) and the oxygen inlet port (5)
The oxygen distribution manifold (1) and the oxygen outlet port (7)

(Ref. AMM TASK 20-23-22-910-001).
(14) If removed, install the LP oxygen pressure-switch (11) on the oxygen distribution manifold (1) (Ref. AMM TASK 35-13-14-400-001).
(15) Put a red paint mark on the connection between the oxygen distribution manifold (1) and the LP oxygen pressure-switch (11) (Ref. AMM TASK 20-23-22-910-001).

NOTE: It is not necessary to install a new OXYGEN CLEAN stickers.

(16) Connect the electrical connector (10):
(a) Remove the CAP-BLANKING from each electrical connector and receptacle.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(b) Connect the electrical connector (10) to the LP oxygen pressure-switch (11).

Subtask 35-12-81-400-050-B ** ON A/C NOT FOR ALL

A. Installation of Oxygen Distribution Manifold
(1) FOR [5753HM1] (MANIFOLD DISTRIBUTION)
(a) Do a visual inspection of the component interfaces and the adjacent area.
(b) Clean the component interfaces and the adjacent area.
(c) Make sure that the parts retained from the removed component are clean and in the correct condition.
(d) Remove the oxygen distribution manifold (4) from the BAG - VINYL.
(e) Put the oxygen distribution manifold (4) in position on its support (1).
(f) Install the washers (6) and the bolts (5).
(g) Tighten the bolts (5).
(h) Remove the BAG-VINYL and then the PLUG-BLANKING, APPROVED FOR USE WITH OXYGEN from each disconnected line end.
(i) Install the new AIPC 35-12-81-09-010 RING (9) or AIPC 35-12-81-09-015 RING (9) on the oxygen distribution manifold (4).
(j) Make sure that the rings (9) stay in the correct position on the oxygen distribution manifold (4).
(k) Connect the oxygen inlet port (8) and the oxygen outlet ports (11) to the oxygen distribution manifold (4).
(l) TORQUE the coupling nuts (7) and (10) to between 20.3 and 14.6 m.N (14.97 and 10.77 lbf.ft )

.
(m) Put a red paint mark on the connection between:

The oxygen distribution manifold (4) and the oxygen inlet port (8)
The oxygen distribution manifold (4) and the oxygen outlet ports (11)

(Ref. AMM TASK 20-23-22-910-001).
(n) If removed, install the LP oxygen pressure-switch (3) on the oxygen distribution manifold (4) (Ref. AMM TASK 35-13-14-400-802).
(o) Put a red paint mark on the connection between the oxygen distribution manifold (4) and the LP oxygen pressure-switch (3) (Ref. AMM TASK 20-23-22-910-001).

NOTE: It is not necessary to install a new OXYGEN CLEAN stickers.

(p) Connect the electrical connector (2):
1 Remove the CAP-BLANKING from each electrical connector and receptacle.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

2 Connect the electrical connector (2) to the LP oxygen pressure-switch (3).
(2) FOR [5753HM2] (MANIFOLD DISTRIBUTION)
(a) Do a visual inspection of the component interfaces and the adjacent area.
(b) Clean the component interfaces and the adjacent area.
(c) Make sure that the parts retained from the removed component are clean and in the correct condition.
(d) Remove the oxygen distribution manifold (4) from the BAG - VINYL.
(e) Put the oxygen distribution manifold (4) in position on its support (12).
(f) Install the washers (6) and the bolts (5).
(g) Tighten the bolts (5).
(h) Remove the BAG-VINYL and then the PLUG-BLANKING, APPROVED FOR USE WITH OXYGEN from each disconnected line end.
(i) Install the new AIPC 35-12-81-11-010 RING (9) on the oxygen distribution manifold (4).
(j) Make sure that the rings (9) stay in the correct position on the oxygen distribution manifold (4).
(k) Connect the oxygen inlet port (8) and the oxygen outlet ports (11) to the oxygen distribution manifold (4).
(l) TORQUE the coupling nuts (7) and (10) to between 20.3 and 14.6 m.N (14.97 and 10.77 lbf.ft )

.
(m) Put a red paint mark on the connection between:

The oxygen distribution manifold (4) and the oxygen inlet port (8)
The oxygen distribution manifold (4) and the oxygen outlet ports (11)

NOTE: It is not necessary to install a new OXYGEN CLEAN stickers.

(p) Connect the electrical connector (2):
1 Remove the CAP-BLANKING from each electrical connector and receptacle.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

2 Connect the electrical connector (2) to the LP oxygen pressure-switch (3).

Subtask 35-12-81-865-051-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 35-12-81-790-050-A ** ON A/C NOT FOR ALL

C. Leak Check
(1) Remove the WARNING NOTICE(S).
(2) 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).
(3) Apply a layer of Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) to the mechanical connections of the oxygen distribution manifold.

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.

(4) Very slowly open the manual shutoff valve (3 to 4 turns) of the crew oxygen-storage cylinder (5750HM).
(5) 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.

(6) Fully open the manual shutoff valve of the crew oxygen-storage cylinder (5750HM)
(7) Examine each mechanical connection of the oxygen distribution manifold and make sure that there are no leaks.
(8) Remove the Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) from the connections with a Textile-Lint free Cotton - (Material No.14SBA1) .

Subtask 35-12-81-790-050-C ** ON A/C NOT FOR ALL

(4) Slowly and fully open the manual shutoff valve of the crew oxygen-storage cylinders (5750HM1 and 5750HM2).
(5) Examine each mechanical connection of the oxygen distribution manifold and make sure that there are no leaks.
(6) Remove the Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) from the connections with a Textile-Lint free Cotton - (Material No.14SBA1) .

Subtask 35-12-81-710-050-A

D. Test
(1) Do the operational test of the crew oxygen distribution (Ref. AMM TASK 35-12-00-710-001).

5. Close-up
Subtask 35-12-81-860-051-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) In the cockpit, on the overhead panel, on the OXYGEN section of panel 21VU:
(a) Make sure that the CREW SUPPLY pushbutton switch is released (the OFF legend is on).
(2) Make sure that the manual shutoff valve of the crew oxygen-storage cylinder (5750HM) is open.

Subtask 35-12-81-860-051-B ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) In the cockpit, on the overhead panel, on the OXYGEN section of panel 21VU:
(a) Make sure that the CREW SUPPLY pushbutton switch is released (the OFF legend is on).
(2) Make sure that the manual shutoff valves of the crew oxygen-storage cylinders (5750HM1 and 5750HM2) are fully open.

Subtask 35-12-81-410-050-A

B. Close Access
(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 35-12-81-862-050-A

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

[Rev.10 from 2021] 2026.04.01 01:04:22 UTC