A319/ A320/ A321

TECHNICAL TRAINING MANUAL

ATA 35

OXYGEN

Under no circumstances should this document be used as a reference

This document must be used for training purposes only.

Future updates will not be issued to the holder of this manual.

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OXYGEN – TABLE OF CONTENTS

GENERAL
Oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
CREW OXYGEN
Crew OXY Mask Utiliz/Stowage/Tests . . . . . . . . . . . . . . . . . . . . . . . . 19
PORTABLE OXYGEN
Crew Portable Oxygen System D/O . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Cabin Portable Oxygen Equipment D/O . . . . . . . . . . . . . . . . . . . . . . . 27
MAINTENANCE PRACTICE
Crew Oxygen Cylinder Removal & Installation . . . . . . . . . . . . . . . . . . 33

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OXYGEN
SYSTEM OVERVIEW

The oxygen system consists of:

- crew system,
- passenger system,
- portable system.

The Flight Crew Oxygen System supplies oxygen to the flight crew. It is
used if there is a loss of cabin pressurization or smoke or dangerous
gases in the cockpit. The oxygen is supplied by a high pressure oxygen
cylinder to quick donning masks in the cockpit.

Passenger Oxygen System

The passenger and cabin attendant oxygen system is supplied by
chemical oxygen generator units located in the cabin, cabin attendant
stations, lavatories and galleys.
Two types of chemical generators are offered which provide oxygen for
15 minutes or 22 minutes.

Portable Oxygen System

The portable oxygen system supplies oxygen to the passengers, the
cabin attendants and the flight crew in an emergency and for first aid
treatment.
The smoke hood system provides breathing means and eye protection
for the flight crew members and cabin attendants. It permits them to
move freely to extinguish a fire. The high pressure portable cylinder
with continuous flow type masks supplies first aid oxygen for the
passengers.

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SYSTEM OVERVIEW
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SYSTEM OVERVIEW (continued)

FLIGHT CREW OXYGEN SYSTEM On the lower ECAM DU, on the DOOR/OXY page, the oxygen
pressure in the cylinder is indicated as follows:
The flight crew oxygen is supplied from a high-pressure oxygen cylinder (a) 0 to 27.5 bar (0 to 400 psig) in amber.
at a pressure of 127.5 bar (1.850 psig). This cylinder can be isolated for (b) 27.5 to 127.5 (400 to 1850 psig) in green.
maintenance by a manual ON/OFF valve. (c) An amber half frame appears when the oxygen pressure is lower
A direct-reading pressure gage gives an indication of the cylinder than 1500 psig.
pressure, independent of the open or closed position of the manual
valve. The cylinder is installed in a cradle with two quick-release clamps If the oxygen pressure drops below the minimum operating pressure of
in the L/H avionics compartment. 3.45 plus or minus 0.35 bar (50 plus or minus 5 psig), the indication
A pressure regulator transmitter assembly is directly connected to the REGUL LO PR is shown amber on the DOOR/OXY page. The mask
cylinder. It consists of a high-pressure stage with an integrated assembly and the stowage box are installed adjacent to each crew
pressure transducer for ECAM indication and a low pressure stage. member seat. The stowage box contains the mask, when the mask is
The pressure regulator regulates the low pressure at 4.48 to 6.48 bar pulled out of the box a supply valve installed in the stowage box will
(65 to 94 psig). A supply valve opens or closes the crew oxygen supply. open and let oxygen flow to the mask.
The CREW SUPPLY P/B on the oxygen panel controls the supply
valve. High pressure and low pressure protection is achieved by safety To use the mask, squeeze the red clips. This will inflate the mask
devices consisting of a high-pressure safety outlet and a low pressure harness. Bring the mask in position and release the red clips.
safety outlet. The high-pressure safety outlet is a frangible disk type. Releasing the red clips will stop oxygen flow to the harness and vent
The low pressure safety outlet is a pressure relief valve. An overboard the oxygen remaining in the harness to the atmosphere. Now the mask
green discharge indicator is connected to the high pressure safety is ready for use.
outlet and to the low pressure safety outlet.

In case of over pressure, the green disk blows out and a yellow
indicator is displayed showing that the cylinder has discharged or the
pressure relief valve has opened. A pressure switch and a test port are
connected to the distribution manifold.

The pressure switch operates when the oxygen supply pressure

decreases to 3.45 plus or minus 0.35 bar (50 plus or minus 5 psig) and
transmits a warning signal REGUL LO PR to the ECAM/DOOR/OXY
page.

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SYSTEM OVERVIEW - FLIGHT CREW OXYGEN SYSTEM

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SYSTEM OVERVIEW (continued)

PASSENGER OXYGEN SYSTEM

The masks are dropped automatically when the cabin altitude is higher
than 14000 feet or manually by crew action on the MASK MANual ON
pushbutton. A taped message is transmitted on the passenger address
system. The passenger SYStem ON indicator light comes on white
when the passenger oxygen system is electrically supplied. A reset is
available to rearm the electrical system after mask re stowage. A
release tool allows manual opening of the door in case of failure of the
container door opening system.

When the TiMeR RESET pushbutton is pressed, the ON white light of

the TMR RESET pushbutton comes on. The indicator light SYS ON
goes off and the taped announcement stops. On ground, used chemical
oxygen units must be replaced and all masks re stowed. The system is
reset by momentarily pressing the TMR RESET pushbutton on the
maintenance panel.

Manually operated doors stops are fitted on the container doors to allow
an operational test of the mask release system. When set to test
position the door stops will prevent doors from fully opening and masks
from dropping out of the container.

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SYSTEM OVERVIEW - PASSENGER OXYGEN SYSTEM

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SYSTEM OVERVIEW (continued)

CREW PORTABLE OXYGEN SYSTEM

The crew oxygen bottle pressure is indicated on the bottle direct

reading gage. Correct pressure is shown when the needle is in the
FULL range of the gage. Incorrect pressure will lead to portable oxygen
bottle replacement. The smoke hood is vacuum packed in a
transport/storage container.

The container is provided with two indications, which are used for
preflight inspection:
- A good condition indicator: green - operational, red - not operational),
- A tamper seal (in position - operational, broken - not operational).

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SYSTEM OVERVIEW - CREW PORTABLE OXYGEN SYSTEM

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SERVICING
CREW OXYGEN CYLINDER REMOVAL/INSTALLATION Remove the blanking cap from the pressure regulator transmitter
assembly and the corresponding stowage cap on the cylinder head.
The oxygen cylinder has to be removed in case of low contents (low Put the regulator on the valve and tighten the nut.
pressure) or leakage and replaced by a fully charged cylinder. Put the Apply the SPECIAL MATERIAL solution to the mechanical
access platform in position and open the access door 812. Close the connections.
oxygen cylinder ON/OFF valve. Very slowly, open the valve of the cylinder 3.5 to 4 turns.
Let the pressure become stable, this occurs after approximately 90
Bleed and empty the oxygen system: seconds. Fully open the cylinder valve.
- press the OXYGEN/CREW SUPPLY pushbutton, Examine each connection to make sure that there are no leaks.
- on one of the oxygen masks, actuate the PRESS TO TEST AND Rub off the SPECIAL MATERIAL solution.
RESET slider several times to empty the system, Make sure that the work area is clean and clear of tools and other
- release the OXYGEN/ CREW SUPPLY P/B. items.
Close the access door 812.
Open, safety and tag the OXYGEN/ CREW/OXYgen/ SupPLY circuit Remove the safety clip and the tag. Close the circuit- breaker 1HT.
breaker 1HT.
Disconnect the pressure regulator transmitter assembly from the
oxygen cylinder.
Put a blanking cap on the pressure regulator and put it in a sealed vinyl
bag.
Put an oxygen cylinder cap on the cylinder valve.
Disconnect the HP safety hose from the cylinder head; discard the
sleeve and put a blanking cap on the union.
Put an oxygen cylinder stowage cap on the cylinder valve.
Loosen the nut and disengage the pin from the clamp to remove the
cylinder from the support.
Make sure that the parts retained from the removed component are
clean and in the correct condition.
Check the expiration date on the cylinder to make sure it can still be
used.
Carefully put the cylinder on the support. Close the clamp and tighten
the pin.
Remove the oxygen cylinder stowage cap from the cylinder valve.
Remove the blanking cap from the HP safety connector.
Put a new sleeve on the union and tighten the HP safety connector on
the cylinder head.

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SERVICING - CREW OXYGEN CYLINDER REMOVAL/INSTALLATION

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SERVICING (continued)
SAFETY PRECAUTIONS

Keep all hydrocarbons (fuels, lubricants, etc. ) away from oxygen

sources. Oxygen becomes explosive when it comes in contact with
hydrocarbons.
Clean the tools and make sure your hands are clean to prevent
contamination of the oxygen system.
Put dry and clean, metal or plastic plugs on all pipes or units removed
temporarily.
Put each pipe or unit in a sealed vinyl bag.
CAUTION: DO NOT PULL THE GENERATOR-END OF THE
LANYARD. YOU MUST INSTALL THE SAFETY RINGS OR
THE SAFETY PINS IF YOU:
- MOVE THE GENERATORS TO A DIFFERENT LOCATION,
OR
- PUT THEM INTO STORAGE. IF YOU DO NOT, THE
GENERATORSGENERATORS CAN OPERATE AND CAUSE
DAMAGE.

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SERVICING - SAFETY PRECAUTIONS

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DAILY CHECK
During the daily check the external walk around will include the visual
check of the crew oxygen cylinder overpressure (Green) discharge disc
to be sure that it is not missing.
The ECAM DOOR/OXY page shows the crew oxygen pressure
indication.
If the pressure is less than 1500 PSI a half box (advisory) is shown for
information.
In this case, check the AMM. This is to see if the minimum oxygen
pressure available to the flight crew is within the permitted limits.
Refer to the minimum flight crew oxygen pressure chart and find the
Minimum Pressure according to the ambient temperature and the
number of crew members.
If the pressure is less than the minimum flight crew oxygen pressure
the oxygen cylinder must be changed.
Push the reset test slider, the blinker turns yellow and goes back to
black again showing that the regulator is leak tight.
Press the harness inflation control, the blinker turns yellow and goes
back to black again showing that the harness is leak tight.
Pressing the emergency rotation knob tests the on demand system.
The microphone is tested by activating the loudspeakers, the
interphone, and by pressing the emergency rotation knob.
When the tests are completed, make sure that the NORMAL / 100%
selector is locked in the 100% position, and the reset slider returns to
the UP position.

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DAILY CHECK
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THIS PAGE IS INTENTIONALLY BLANK

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DAILY CHECK
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MAINTENANCE TIPS
CREW OXYGEN MASK STOWING

Proper stowing of the mask is essential for quick and efficient donning
of the mask.
Open the stowage box flap doors and position the flexible hose
correctly.
Engage the mask assembly with the regulator on top.
Close the left flap door carefully while pushing the reset test slider to
retract the OXY ON flag.
At the end of the re stowing operation, do the IN SITU TEST.

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MAINTENANCE TIPS - CREW OXYGEN MASK STOWING

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CREW OXY MASK UTILIZ/STOWAGE/TESTS

UTILIZATION TESTS

The mask assembly and the stowage box are installed adjacent to each Push the reset test slider. The blinker turns yellow and goes black
crewmember seat. The stowage box contains the mask, when the mask again showing that the regulator is leak tight.
is pulled out of the box, a supply valve installed in the stowage box will Press the harness inflation control. The blinker turns yellow and goes
open and let oxygen flow to the mask. To use the mask, squeeze the black again showing that the harness is leak tight. The on demand
red clips, which will inflate the mask harness; releasing the red clips will system is tested by pressing the emergency rotation knob.
stop oxygen flow to the harness and vent the oxygen remaining in the The microphone is tested by activating the loudspeakers, the
harness to the atmosphere. Oxygen flow is indicated by the blinker interphone, and by pressing the emergency rotation knob. When the
showing yellow and an OXY ON flag, which appears on the left door previous tests are completed, make sure that the Normal/100 %
when closed. The mask regulator provides either normal or pure selector is locked in the 100% position, and the reset test slider return
oxygen by means of a Normal/100% selector. In the Normal position, to the UP position.
the user breathes a mixture of cabin air and oxygen. When the selector
is in the 100% position, the user will breathe pure oxygen. When the
emergency rotation knob is rotated and the Normal/100% selector in
the 100% position, the mask regulator supplies pure oxygen at a
permanent positive pressure. To take the mask off, the harness has to
be inflated. This is done by operating the red clips.

STOWAGE

Proper stowing of the mask is essential for quick and efficient donning
of the mask. Open the stowage box flap doors, and position the flexible
hose correctly. Engage the mask assembly, regulator on top. Close the
left flap door carefully while pushing the reset test slider to retract the
OXY ON flag. At the end of the restowing operation, do the: IN SITU
TESTING.

Associated film is UM35D1T20S00001.MPG. The above text is for

documentation only. Do not record this text; do not put it in ATLAS
module.

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UTILIZATION ... TESTS

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CREW PORTABLE OXYGEN SYSTEM D/O

GENERAL

The crew smoke hood system provides eyes protection and supplies
oxygen to the crew member in case of emergency: fire, or an emission
of smoke or noxious gases. The crew smoke hood system allows
freedom of movement to extinguish a fire.

LOCATION

The complete hood is vacuum-packed in a transport/storage container.

A breathing hood container is installed in the cockpit. Smoke hoods for
cabin crew are installed in cabin.

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GENERAL & LOCATION

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CREW PORTABLE OXYGEN SYSTEM

DESCRIPTION

The container is installed with a tamper seal and a serviceability

Indicator for the preflight inspection; the serviceability indicator is
broken after opening the box.

NOTE: According to the supplier, another indicator is available which

shows a yellow indicator if the container has not been opened.

The protective breathing hood works with a closed breathing circuit.

The system is activated by a starter via a lanyard. The expired air will
be regenerated, enriched with oxygen, and inhaled again. The oxygen
is generated in exothermic chemical reaction between the potassium
peroxide (KO2), the humidity, and the carbon dioxide (CO2) in the
expired air; this reaction releases heat. The protective breathing
equipment is composed of three main parts:

A hood with:
- the neck seal at the level of the neck,
- the straps attached to the hood maintain the inner mask around the
back of the user head,
- a relief valve in the hood, which keeps the overpressure in the hood at
a comfortable level.

An inner mask installed with:

- an anti-suffocation valve, operated by a higher breathing resistance.
The user can inhale through this valve from the volume between
head and hood,
- a speech transmitter is located in front of the oronasal mask.

A KO2 cartridge has:

- an attached breathing bag installed with a volume-controlled relief
valve,
- a starter activated by a lanyard,
- a fold tube (or breathing hose) connected to the oronasal mask,
- a belt, which holds the cartridge on the hood.

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DESCRIPTION
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CREW PORTABLE OXYGEN SYSTEM

OPERATION

The breathing hood is stored under a vacuum in a specially designed

bag. The bag is mounted inside a box in such a way that, after opening
the box, the hood is removed and the vacuum protection is
automatically opened with a single movement. The hood is fire
resistant.

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OPERATION
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CABIN PORTABLE OXYGEN EQUIPMENT D/O

BOTTLE

The oxygen source is a high-pressure cylinder. The high-pressure

cylinders are installed in brackets with quick-release clamps.

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BOTTLE
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CABIN PORTABLE OXYGEN EQUIPMENT D/O

FIRST AID MASK

The continuous-flow first aid oxygen mask supplies oxygen for

therapeutic purposes. The flexible supply hose connects the mask to
the calibrated continuous-flow outlet of the bottle.

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FIRST AID MASK

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CABIN PORTABLE OXYGEN EQUIPMENT D/O

SMOKE HOOD SYSTEM

The smoke hood system gives breathing means and eyes protection for
one user in case of: fire, or emission of smoke and/or noxious gases. It
lets the user move freely. The smoke hood container is installed with a
good-condition indicator and a tamper seal for the pre-flight inspection.
The annular container in the hood, full of compressed oxygen, releases
the amount of oxygen that the user needs. The gas circulation is
generated when the user breathes in and out. Cockpit smoke hood
container can be optionally installed in the cabin.

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SMOKE HOOD SYSTEM

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CREW OXYGEN CYLINDER REMOVAL & INSTALLATION

REMOVAL

WARNING: KEEP ALL HYDROCARBONS (FUEL, LUBRICANTS,

ETC...) AWAY FROM ALL SOURCE OF OXYGEN. OXYGEN
BECOMES EXPLOSIVE WHEN IT TOUCHES
HYDROCARBONS.
CLEAN THE TOOLS AND MAKE SURE YOUR HANDS ARE
CLEAN TO PREVENT CONTAMINATION OF THE OXYGEN
SYSTEM.

JOB SET-UP (1/2)

Put the access platform in position and open the access door 812.
Energize the aircraft electrical circuits; make sure that the avionics
equipment ventilation operates correctly. Close the valve of the oxygen
cylinder valve assembly.

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REMOVAL - JOB SET-UP (1/2)

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CREW OXYGEN CYLINDER REMOVAL & INSTALLATION

REMOVAL (continued)

JOB SET-UP (2/2)

Bleed and empty the oxygen system:

- Press the OXYGEN/CREW SUPPLY P/BSW. The OFF legend goes
off.
- On one of the oxygen masks, actuate the PRESS TO TEST AND
RESET slider several times to empty the system.
- Release the OXYGEN/CREW SUPPLY P/BSW. The OFF legend
comes on.
- Put a warning notice to tell persons not to push the OXYGEN/CREW
SUPPLY P/BSW.
Open, safety and tag the CREW OXY SPLY circuit breaker.

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REMOVAL - JOB SET-UP (2/2)

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CREW OXYGEN CYLINDER REMOVAL & INSTALLATION

REMOVAL (continued)

PROCEDURE

Loosen the nut and disconnect the pressure regulator transmitter from
the oxygen cylinder.
Put a blanking cap on the pressure regulator and put it in a sealed
vinyl bag.
Put an oxygen cylinder stowage cap on the cylinder valve.
Disconnect the union and discard the bush.
Put a blanking cap on the union.
Put an oxygen cylinder stowage cap on the cylinder valve.
Loosen the nut and disengage the pin from the clamp to remove the
cylinder from the support.

INSTALLATION

Make sure that the aircraft is in the same configuration as for the
removal operation.
Make sure that the parts retained from the removed component are
clean and in the correct condition.

PROCEDURE

Check the expiration date on the cylinder to make sure it can still be
used.
Carefully put the cylinder on the support, close the clamp and tighten
the pin.
Remove the oxygen cylinder stowage cap from the cylinder valve.
Remove the blanking cap from the union.
Put a new bush on the union and tighten it.
Remove the blanking cap from the pressure regulator transmitter
assembly and the corresponding stowage cap on the cylinder head.
Put the regulator on the valve and torque the nut.

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REMOVAL & INSTALLATION

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CREW OXYGEN CYLINDER REMOVAL & INSTALLATION

INSTALLATION (continued)

Leak test

Apply the special materials solution to the mechanical connections.

Very slowly, open the valve of the cylinder 3.5 to 4 turns.
Let the pressure become stable, this occurs after approximately 90
seconds.
Fully open the cylinder valve.
Examine each connection to make sure that there are no leaks.
Rub off the special materials solution.

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INSTALLATION - LEAK TEST

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CREW OXYGEN CYLINDER REMOVAL & INSTALLATION

INSTALLATION (continued)

Close-up

Remove the safety clip and the tag and close the circuit breaker.
Make sure that the work area is clean and clear of tools and other
items.
Remove the warning notice.
De-energize the aircraft electrical circuits.
Close the access door 812 and remove the access platform.

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INSTALLATION - CLOSE-UP
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