Servicing of the Oxygen-Replenishing

TASK 12-14-35-600-001-A
Servicing of the Oxygen-Replenishing

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: OBEY THESE SPECIAL PRECAUTIONS WHEN YOU DO THIS PROCEDURE:

CAREFULLY OBEY THE REPLENISHING INSTRUCTIONS. IF YOU DO NOT OBEY THESE INSTRUCTIONS, YOU CAN CAUSE A FIRE OR AN EXPLOSION.
PREVENT ALL MAINTENANCE PROCEDURES NEARER THAN 5 M (16.4 FT) TO THE WORKING AREA OF THE AIRCRAFT.
STOP ALL REFUELING, ALL REPAIRS ON FUEL AND HYDRAULIC SYSTEMS, AND ALL PROCEDURES THAT USE FLAMMABLE MATERIALS SUCH AS CLEANING AND DE-ICING MATERIALS.
PUT A WARNING NOTICE IN THE COCKPIT, THE WORK AREA AND THE CABIN TO TELL PERSONS NOT TO OPERATE ELECTRICAL SWITCHES DURING THE OXYGEN FILLING PROCEDURE.
TELL ALL PERSONS IN THE AIRCRAFT THAT THE OXYGEN FILLING PROCEDURE IS IN PROGRESS.
IF YOU THINK THAT A THUNDERSTORM WILL OCCUR, IMMEDIATELY STOP ALL OXYGEN FILLING OPERATIONS.

WARNING: BEFORE YOU DO THIS PROCEDURE, MAKE SURE THAT THE OXYGEN GROUND FILLING EQUIPMENT IS ELECTRICALLY BONDED TO THE AIRCRAFT. IF THIS EQUIPMENT IS NOT CORRECTLY BONDED, AN ELECTRICAL DISCHARGE CAN OCCUR WHICH CAN CAUSE AN EXPLOSION OR FIRE.

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: 123
ZONE: 125
ZONE: 210

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)
No specific	1	CABLE-BONDING
No specific	1	CART - GROUND, OXYGEN
No specific	1	THERMOMETER
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.73 and 0.63 m.daN (64.60 and 55.75 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
123	NOSE GEAR WELL
125	LATERAL AVIONIC COMPARTMENT
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
812

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-34-24-869-001-A	Aircraft Bonding and Grounding (Earthing) for the Refuel/Defuel or Oxygen Servicing Operations
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
Location of the Oxygen System ** ON A/C NOT FOR ALL
Oxygen System ** ON A/C NOT FOR ALL
Location of the Oxygen Filling-Port ** ON A/C NOT FOR ALL
Filling Pressure
Location of the Oxygen Filling-Port ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 12-14-35-941-055-A

A. Safety Precautions
(1) Obey the special precautions when you do work on a gaseous oxygen system (Ref. AMM TASK 35-00-00-860-001).

Subtask 12-14-35-861-050-A

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

Subtask 12-14-35-010-054-A

C. Get Access
(1) Put an 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 12-14-35-860-055-A ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration

Location of the Oxygen System ** ON A/C NOT FOR ALL

(1) Make sure that the overboard discharge indicator shows green.
(2) Put a WARNING NOTICE(S) in the work area to tell persons that the oxygen filling operation is dangerous.
(3) Make sure that the date of the test given on the cylinder is in the permitted time limit.
(4) Do a visual inspection of the emergency oxygen-cylinders to make sure that there is no sign of:
(a) Abrasion
(b) Cuts
(c) Dents
(d) Delamination
(e) Heat or fire damage
(f) Structural damage
(g) Chemical damage.

Subtask 12-14-35-860-055-B ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) In the avionics compartment:
(a) Put a WARNING NOTICE(S) in position in the work area to tell persons that the oxygen filling procedure is dangerous and in progress.
(2) On the outer side of the aircraft, on the left side between frames 12 and 13:
(a) Make sure that the disc on overboard discharge-indicator 5756HM1 is green.
(3) On the outer side of the aircraft, on the left side between frames 17 and 18:
(a) Make sure that the disc on overboard discharge-indicator 5756HM2 is green.
(4) Make sure that the date of the hydrostatic test given on each crew oxygen-storage cylinders (5750HM1 and 5750HM2) shows serviceable.
Refer to the applicable CMM.
(5) Do a visual inspection of the emergency oxygen-cylinders to make sure that there is no sign of:
(a) Abrasion
(b) Cuts
(c) Dents
(d) Delamination
(e) Heat or fire damage
(f) Structural damage
(g) Chemical damage.

Subtask 12-14-35-865-053-A

E. 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 12-14-35-860-051-A ** ON A/C NOT FOR ALL

F. 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) Check of the position of the manual shutoff valve

CAUTION: WHEN YOU OPEN THE MANUAL SHUTOFF VALVE ON THE CREW OXYGEN-STORAGE CYLINDER, MAKE SURE THAT:

YOU TURN IT VERY SLOWLY
YOU TURN IT UNTIL IT IS FULLY OPEN.

IF YOU TURN THE MANUAL SHUTOFF VALVE TOO QUICKLY, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT. IF THE MANUAL SHUTOFF VALVE IS NOT FULLY OPEN, THE OXYGEN PRESSURE DATA CAN BE INCORRECT.

(a) Make sure that the manual shutoff valve of the crew oxygen-storage-cylinder 5750HM is fully open.
(3) On the CART - GROUND, OXYGEN and on the aircraft:
(a) Make sure that the oxygen line end-fittings and the electrical connectors are in the correct condition.
(4) Grounding (earthing) and bonding

(a) Obey the local regulations for the grounding (earthing) of the aircraft. If you must ground (earth) the aircraft:

Ground (earth) the oxygen ground-filling equipment and the aircraft correctly (Ref. AMM TASK 12-34-24-869-001).

(b) Electrically bond the oxygen ground-filling equipment to the aircraft as follows:
1 Connect an electrostatic CABLE-BONDING between the aircraft and the CART - GROUND, OXYGEN (Ref. AMM TASK 12-34-24-869-001).

Subtask 12-14-35-860-051-C ** ON A/C NOT FOR ALL

F. Aircraft Maintenance Configuration

Oxygen System ** ON A/C NOT FOR ALL

(1) Check of the positions of the manual shutoff-valves

CAUTION: WHEN YOU OPEN THE MANUAL SHUTOFF VALVE ON THE CREW OXYGEN-STORAGE CYLINDER, MAKE SURE THAT:

YOU TURN IT VERY SLOWLY
YOU TURN IT UNTIL IT IS FULLY OPEN.

IF YOU TURN THE MANUAL SHUTOFF VALVE TOO QUICKLY, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT. IF THE MANUAL SHUTOFF VALVE IS NOT FULLY OPEN, THE OXYGEN PRESSURE DATA CAN BE INCORRECT.

(a) Make sure that the manual shutoff valve (1) of the crew oxygen-storage-cylinder 5750HM1 is fully open.
(b) Make sure that the manual shutoff valve (3) of the crew oxygen-storage-cylinder 5750HM2 is fully open.
(2) On the CART - GROUND, OXYGEN and on the aircraft:
(a) Make sure that the oxygen line end-fittings and the electrical connectors are in the correct condition.
(3) Grounding (earthing) and bonding

(a) Obey the local regulations for the grounding (earthing) of the aircraft. If you must ground (earth) the aircraft:

Ground (earth) the oxygen ground-filling equipment and the aircraft correctly (Ref. AMM TASK 12-34-24-869-001).

NOTE: The bonding of the oxygen ground-filling equipment to the aircraft is mandatory. For the grounding (earthing), you must obey the local regulations.

4. Procedure
Subtask 12-14-35-614-051-A ** ON A/C NOT FOR ALL

A. Filling of the Oxygen Cylinder

WARNING: OBEY THESE SPECIAL PRECAUTIONS WHEN YOU DO THIS PROCEDURE:

CAREFULLY OBEY THE REPLENISHING INSTRUCTIONS. IF YOU DO NOT OBEY THESE INSTRUCTIONS, YOU CAN CAUSE A FIRE OR AN EXPLOSION.
PREVENT ALL MAINTENANCE PROCEDURES NEARER THAN 5 M (16.4 FT) TO THE WORKING AREA OF THE AIRCRAFT.
STOP ALL REFUELING, ALL REPAIRS ON FUEL AND HYDRAULIC SYSTEMS, AND ALL PROCEDURES THAT USE FLAMMABLE MATERIALS SUCH AS CLEANING AND DE-ICING MATERIALS.
PUT A WARNING NOTICE IN THE COCKPIT, THE WORK AREA AND THE CABIN TO TELL PERSONS NOT TO OPERATE ELECTRICAL SWITCHES DURING THE OXYGEN FILLING PROCEDURE.
TELL ALL PERSONS IN THE AIRCRAFT THAT THE OXYGEN FILLING PROCEDURE IS IN PROGRESS.
IF YOU THINK THAT A THUNDERSTORM WILL OCCUR, IMMEDIATELY STOP ALL OXYGEN FILLING OPERATIONS.

(1) Remove the blanking plug from oxygen filling-port 5769HM.
(2) Connect the flexible hose of the CART - GROUND, OXYGEN to oxygen filling-port 5769HM.

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT EQUIPMENT FROM FLEXIBLE HOSES AND RIGID TUBING. IF YOU DO NOT USE THE SECOND WRENCH, THERE IS A RISK THAT YOU WILL CAUSE DAMAGE TO THE HOSES AND TUBES.

(a) TORQUE the flexible hose to between 0.73 and 0.63 m.daN (64.60 and 55.75 lbf.in )

.
(3) Use a THERMOMETER to measure the Outside Air Temperature (OAT) and the cockpit temperature.
(4) Use the formula shown on the aircraft placard below oxygen filling-port 5769HM, to calculate the reference temperature.

Location of the Oxygen Filling-Port ** ON A/C NOT FOR ALL

Filling Pressure ** ON A/C NOT FOR ALL

(5) Find the related filling pressure with the calculated reference temperature and the data of the aircraft shown on the aircraft placard.

Location of the Oxygen Filling-Port ** ON A/C NOT FOR ALL

Filling Pressure ** ON A/C NOT FOR ALL

(a) If the calculated filling pressure (related to the ambient temperature) is more than 2000 psi (137.90 bar), do not fill the cylinder to more than 2000 psi (137.90 bar).

NOTE: This is because the maximum graduation of the pressure gage is 2000 psi (137.90 bar).

(6) Open the filling source of the CART - GROUND, OXYGEN and slowly pressurize the oxygen cylinder.
(a) Make sure that you do not quickly fill the oxygen cylinder more than the maximum filling speed shown on the aircraft placard.
(7) Make sure that the filling pressure is correct on the pressure gage of crew oxygen-storage-cylinder 5750HM.
(8) Close the filling source of the CART - GROUND, OXYGEN.

Subtask 12-14-35-210-055-A ** ON A/C NOT FOR ALL

B. Test(s)
(1) In the cockpit, on the OXYGEN section of overhead control and indicating panel 21VU:
(a) Push the CREW SUPPLY pushbutton switch (the OFF legend goes off).
(2) Make sure that the pressure shown on oxygen filling-indicator 5HT is the same as the pressure gage of oxygen cylinder 5750HM.

Subtask 12-14-35-614-051-C ** ON A/C NOT FOR ALL

C. Filling of the Oxygen Cylinder

WARNING: OBEY THESE SPECIAL PRECAUTIONS WHEN YOU DO THIS PROCEDURE:

CAREFULLY OBEY THE REPLENISHING INSTRUCTIONS. IF YOU DO NOT OBEY THESE INSTRUCTIONS, YOU CAN CAUSE A FIRE OR AN EXPLOSION.
PREVENT ALL MAINTENANCE PROCEDURES NEARER THAN 5 M (16.4 FT) TO THE WORKING AREA OF THE AIRCRAFT.
STOP ALL REFUELING, ALL REPAIRS ON FUEL AND HYDRAULIC SYSTEMS, AND ALL PROCEDURES THAT USE FLAMMABLE MATERIALS SUCH AS CLEANING AND DE-ICING MATERIALS.
PUT A WARNING NOTICE IN THE COCKPIT, THE WORK AREA AND THE CABIN TO TELL PERSONS NOT TO OPERATE ELECTRICAL SWITCHES DURING THE OXYGEN FILLING PROCEDURE.
TELL ALL PERSONS IN THE AIRCRAFT THAT THE OXYGEN FILLING PROCEDURE IS IN PROGRESS.
IF YOU THINK THAT A THUNDERSTORM WILL OCCUR, IMMEDIATELY STOP ALL OXYGEN FILLING OPERATIONS.

(1) Remove the blanking plug (5) from the applicable oxygen filling-port (6) 5769HM1(5769HM2).
(2) Connect the flexible hose of the CART - GROUND, OXYGEN to oxygen filling-port (6) 5769HM1(5769HM2).

(a) TORQUE the flexible hose to between 0.73 and 0.63 m.daN (64.60 and 55.75 lbf.in )

.
(3) Use a THERMOMETER to measure the Outside Air Temperature (OAT) and the cockpit temperature.
(4) Use the formula shown on the aircraft placard (7) below oxygen filling-port (6) 5769HM1(5769HM2), to calculate the reference temperature.

Location of the Oxygen Filling-Port ** ON A/C NOT FOR ALL

Filling Pressure ** ON A/C NOT FOR ALL

(5) Find the related filling pressure with the calculated reference temperature and the data shown on the aircraft placard (7).

Location of the Oxygen Filling-Port ** ON A/C NOT FOR ALL

Filling Pressure ** ON A/C NOT FOR ALL

(a) If the calculated filling pressure (related to the ambient temperature) is more than 2000 psi (137.90 bar), do not fill the cylinder to more than 2000 psi (137.90 bar).

NOTE: This is because the maximum graduation of the pressure gage is 2000 psi (137.90 bar).

(6) Open the filling source of the CART - GROUND, OXYGEN and slowly pressurize the oxygen cylinder.
(a) Make sure that you do not quickly fill the oxygen cylinder more than the maximum filling speed shown on the aircraft placard (7).
(7) Make sure that the filling pressure is correct on the applicable pressure gage (2) or (4) of crew oxygen-storage-cylinder 5750HM1(5750HM2).
(8) Close the filling source of the CART - GROUND, OXYGEN.

Subtask 12-14-35-210-055-B ** ON A/C NOT FOR ALL

D. Test(s)

Oxygen System ** ON A/C NOT FOR ALL

Location of the Oxygen Filling-Port ** ON A/C NOT FOR ALL

(1) Make sure that the pressure shown on oxygen filling-indicator (8) 5HT1 (5HT2) is the same as the pressure gage (2) or (4) of crew oxygen-storage-cylinder 5750HM1 (5750HM2).

5. Close-up
Subtask 12-14-35-860-052-A ** ON A/C NOT FOR ALL

A. Put the Aircraft Back to its Initial Configuration
(1) In the cockpit, on the OXYGEN section of overhead control and indicating panel 21VU:
(a) Release the CREW SUPPLY pushbutton switch (the OFF legend comes on).
(2) Release the pressure in the filling line through the vent device of the CART - GROUND, OXYGEN.
(3) Disconnect the flexible hose of the CART - GROUND, OXYGEN from oxygen filling-port 5769HM.
(4) Put the PLUG - BLANKING on oxygen filling-port 5769HM.
(5) TORQUE the blanking plug to between 0.73 and 0.63 m.daN (64.60 and 55.75 lbf.in )

.
(6) Disconnect the CABLE-BONDING.
(7) Remove the WARNING NOTICE(S).
(8) Make sure that the work area is clean and clear of tools and other items.

Subtask 12-14-35-860-052-C ** ON A/C NOT FOR ALL

A. Put the Aircraft Back to its Initial Configuration

Location of the Oxygen Filling-Port ** ON A/C NOT FOR ALL

(1) Release the pressure in the filling line through the vent device of the CART - GROUND, OXYGEN.
(2) Disconnect the flexible hose of the CART - GROUND, OXYGEN from the oxygen filling-port (6) 5769HM1 (5769HM2).
(3) Put the PLUG - BLANKING (5) on the oxygen filling-port (6) 5769HM1 (5769HM2).
(4) TORQUE the blanking plug (5) to between 0.73 and 0.63 m.daN (64.60 and 55.75 lbf.in )

.
(5) Disconnect the CABLE-BONDING.
(6) Remove the WARNING NOTICE(S).
(7) Make sure that the work area is clean and clear of tools and other items.

Subtask 12-14-35-410-052-A

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

Subtask 12-14-35-862-050-A

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

[Rev.10 from 2021] 2026.03.31 22:55:59 UTC