Airbus A318/A319/A320/A321 (CFM56) and ATA 35

Airbus A319/A320/A321 (IAE V2500) B1.1 subcategory OXYGEN

TRAINING MANUAL

Airbus A318/A319/A320/A321 (CFM56) and

Airbus A319/A320/A321 (IAE V2500)
B1.1 subcategory

35. OXYGEN
(ATA35)
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TABLE OF CONTENTS TABLE OF FIGURES

OXYGEN SYSTEM PRESENTATION ............................................................. 4 OXYGEN SYSTEM PRESENTATION ............................................................ 5

CREW OXYGEN SYSTEM PRESENTATION ................................................. 6 CREW OXYGEN SYSTEM PRESENTATION ................................................. 7
CREW OXYGEN STORAGE......................................................................... 14 CONTROLS AND INDICATORS .................................................................... 9
PRESSURE REGULATOR / TRANSMITTER ............................................... 16 CREW OXYGEN ELECTRICAL CIRCUIT .................................................... 10
SAFETY SYSTEM ........................................................................................ 18 OPERATION ................................................................................................. 11
EXTERNAL FILLING CONNECTION ........................................................... 20 FLAP DOORS/RED CLIP ............................................................................. 11
OXYGEN − SERVICING ............................................................................... 22 OPERATION ................................................................................................. 11
PASSENGER OXYGEN SYSTEM PRESENTATION AND OPERATION ..... 24 STOWAGE ................................................................................................... 12
PORTABLE OXYGEN EQUIPMENT............................................................. 34 TESTS .......................................................................................................... 12
CREW OXYGEN LRU'S. CREW MASK ....................................................... 13
OXYGEN CYLINDER.................................................................................... 15
PRESSURE REGULATOR ........................................................................... 17
OVERBOARD DISCHARGE INDICATOR .................................................... 19
FIGURE 7 EXTERNAL FILLING CONNECTION .......................................... 21
OXYGEN SERVICING SCHEMATIC ............................................................ 23
CABIN ORGANIZATION .............................................................................. 24
TRIGGERING ............................................................................................... 24
AUTOMATIC OPERATION .......................................................................... 25
MANUAL OPERATION ................................................................................ 25
RESET .......................................................................................................... 26
Manual Release ........................................................................................... 26
MANUAL RELEASE ..................................................................................... 26
PARTS LOCATION ...................................................................................... 27
MASK OPERATION ..................................................................................... 28
CHEMICAL OXYGEN GENERATION .......................................................... 28
OXYGEN GENERATOR ............................................................................... 29
PASSENGER OXYGEN ELECTRICAL CIRCUITS PART 1 ......................... 30
PASSENGER OXYGEN ELECTRICAL CIRCUITS PART 2 ......................... 31
OXYPANEL DOOR STOP ............................................................................ 32
FIRST AID MASK ......................................................................................... 34
BOTTLE ....................................................................................................... 34
BOTTLE/FIRST AID MASK .......................................................................... 35

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OXYGEN SYSTEM PRESENTATION

Crew System

The flight crew oxygen system supplies oxygen to the flight crew if there is a
loss of cabin pressurization, or a smoke emission. The oxygen is supplied by
a high pressure oxygen cylinder. Refill of the oxygen bottle is possible via an
external oxygen cart.

Passenger System

The passenger and cabin attendant oxygen system is supplied by chemical

generator unit.

Portable System

The portable oxygen system supplies oxygen to the crew and to the
passengers. Portable oxygen cylinders are provided in the cockpit and in the
passenger compartment.

General Warnings and Caution

Caution: Keep all hydrocarbons (Fuel, Lubricants, etc.) away from all source
of oxygen. Oxygen becomes explosive when it touches hydrocarbons. Clean
the tool 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.

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OXYGEN SYSTEM PRESENTATION

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CREW OXYGEN SYSTEM PRESENTATION

HP Source Supply Valve

The crew oxygen source consists of a high pressure cylinder which can be A supply valve enables downstream distribution by crew action on the
isolated for maintenance by a manual ON/OFF valve. A direct reading CREW SUPPLY pushbutton on the oxygen panel. Electrical supply to the
pressure gauge gives an indication of the cylinder pressure. solenoid valve Is applied only for 1.5 second corresponding to the operating
time of the valve.
Cylinder data
Distribution
- capacity: 2178 Itr. (77.1 cu ft)
- nominal charge: 1850 PSIG To the low pressure manifold are connected a pressure switch and a test
port. The low pressure switch indicates a low pressure detection in the LP
The cylinder is placed in a cradle and secured by a quick disconnect manifold. It activates a message on the ECAM/DOOR/OXY page.
metallic clamp designed to resist to high crash loads.
- Pressure switch setting: 50 PSIG.
Pressure Regulator - Test port pressure < 145 PSIG.

The pressure regulator transmitter is directly connected to the cylinder. It

consists of a high pressure stage with an integrated pressure transducer for
ECAM indication and a low pressure stage. It regulates low pressure at 78 ±
8 PSIG.

Overpressure Protection

High pressure and low pressure overpressure protection is achieved by

safety devices consisting of a high pressure and a low pressure safety
outlets. The high pressure safety outlet is of a frangible disc type whereas
the low pressure safety outlet is a pressure relief valve. The rupture of the
frangible disk is set at a cylinder pressure of 2500 to 2775 PSIG. The
pressure relief valve limits the low pressure oxygen supply to 175 PSIG.

Overpressure Indication

An overboard green discharge indicator is connected to the high pressure

safety outlet and to the low pressure safety outlet. In case of overpressure,
the green disk blows out and a yellow indicator is displayed showing that the
cylinder has discharged or the pressure relief valve has opened.

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CREW OXYGEN SYSTEM PRESENTATION

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CONTROLS AND INDICATORS

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Crew Oxygen Electrical Circuit

The oxygen solenoid supply valve is two state solenoid valve. It has two
separate windings: an open winding and a closed winding. Each winding
is only supplied for the time necessary to permit valve travel.

CREW OXYGEN ELECTRICAL CIRCUIT

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Crew Oxygen Mask Utilization Stowage and Test

The mask assy and the stowage box are installed adjacent to each crew Oxygen flow is indicated by the blinker showing yellow and an OXY ON flag
member seat. The stowage box which contains the mask, also controls the which appears on the left door when closed. In the normal position, the user
flow of oxygen when the mask is pulled out of the box. breathes a mixture of cabin air and oxygen. When the selector is in the 100%
position, the user will breathe pure oxygen. To take the mask off, the harness
has to be inflated. This is done by operating the red clips.

OPERATION

To use the mask, squeeze the red clips, which will inflate the mask harness
releasing the red clips will stop oxygen flow to the harness and vent the
oxygen remaining in the harness to the atmosphere.

OPERATION

FLAP DOORS/RED CLIP

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Proper stowing of the mask is essential for quick and efficient donning of the Push the reset test slider. The blinker turns yellow and goes black again
mask. Open the stowage box flap doors and position the flexible hose showing that the regulator is leak tight. Press the harness inflation control.
correctly, a) Engage the mask assy, regulator on top. Close the left flap door The blinker turns yellow and goes black again showing that the harness is
carefully while pushing the reset test slider to retract the OXY ON flag. At the leak tight. The on demand system is tested by pressing the emergency
end of the restowing operation, do the: IN SITU TESTING. rotation knob. The microphone is tested by activating the loudspeakers the
interphone and by pressing the emergency rotation knob. When the previous
tests are completed, make sure that the NORMAL /100% selector is locked
In the 100% position, and the reset test slider returns to the UP position.

TESTS
STOWAGE

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CREW OXYGEN LRU'S. CREW MASK

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CREW OXYGEN STORAGE

OXYGEN CYLINDER

General

The flight crew oxygen is supplied from a high—pressure oxygen cylinder

with a pressure regulator / transmitter directly connected to the cylinder head.
It is installed in a cradle with two quick—release clamps between frames 11
and 13 in the avionics compartrnent. The installation can survive crash Ioads
of 1OG’s in aII directions.

Oxygen Cylinder Description

The high pressure oxygen cylinder is made of composite material. The

cylinder has a capacity of 2183 ltr. ( 77 cubic feet ) at a pressure of 127.5
bar (1850 psig ).
The cylinder head is a valve assembly which is made of these components:

A manual sIow−opening ON/OFF valve with a metal seat and poppet,

to reduce the explosion hazard. The valve is used during the
replacement of the cylinder and to isolate the cylinder if there is a Ieak
in the oxygen system.
A direct—reading pressure gage which gives an indication of the
cylinder high−pressure, independent of the open or closed position of
the manual valve.
A high—pressure safety outlet with a discharge indicator. The
discharge indicator is a frangible disc that ruptures at a pressure of
172.5 to 191.5 bar ( 2500 to 2775 psig ). The oxygen is discharged
overboard.

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OXYGEN CYLINDER

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PRESSURE REGULATOR / TRANSMITTER

Pressure Regulator / Transmitter Description

1. The pressure regulator/transmitter is directly connected to the

cylinder. The inlet connection of the pressure regulator/transmitter
Iimits the high—pressure from the oxygen cylinder to the pressure
regulator/transmitter.
2. The high—pressure stage of the pressure regulator/transmitter has an
integrated transducer installed. This sends an electrical signal of the
oxygen pressure to the ECAM system in the cockpit.
3. The Iow—pressure stage of the pressure regulator/transmifter
supplies a pressure of 4.48 to 6.48 bar ( 65 to 94 psig ) to the oxygen
distribution system. This pressure supplies an oxygen flow rate of 0 to
300 I/min ( 0 to 10.6 cubic feet / ,min ) and at an oxygen cylinder
pressure of 6.9 to 140 bar (100 to 2030 psig ).
4. The Iow—pressure safety outlet has an integrated relief valve. This
Iimits the Iow—pressure oxygen supply to a maximum of 12 bar
(175 psig ). The oxygen released by the Iow—pressure safety
outlet is discharged overboard by a safety system.

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PRESSURE REGULATOR

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SAFETY SYSTEM

The high—pressure safety outlet on the oxygen cylinder head and the low
pressure safety outlet on the pressure regulator/transmitter are connected to
a discharge indicator on the fuselage skin ( near the access door 812
).The discharge indicator is a green blowout disc that can be seen from
outside the aircraft. This disc wiII blow out at a pressure of 2.8 to 6.9 bar ( 40
to 100 psig) to show a yellow indicator. This shows that oxygen has been
discharged.

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OVERBOARD DISCHARGE INDICATOR

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EXTERNAL FILLING CONNECTION

The external filling connection is installed in the aircraft between frames 11

and 13. It permits filling of the oxygen cylinder without removal of the cylinder
from the aircraft. The external filling connection is made of the components
below:

1. A filling connector with a filter. The filter prevents entrance of any

moisture or dust into the oxygen system.
2. A filling connector cap with a relief vaive. The relief valve releases
any oxygen pressure of more than 6.9 bar ( 100 psig ) if there is a
Ieak in the check valve of the pressure regulator/transmitter.
3. A flexible hose connects the filling connection to the pressure
reguiator/ transmitter.
4. A pressure gage to indicate the pressure inside the oxygen cylinder
during filling. The pressure gage has a two−color scale with
graduations: 0 to 5.9 bar ( 0 to 85 psig )is red, 5.9 to 138 bar ( 85 to
2000 psig ) is green.
5. The operating pressure is 0 to 140 bar ( 0 to 2030 psig ). The
filling rate is 0 to 500 I/min ( 0 to 17.65 ( cubic feet )/min ).

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FIGURE 7 EXTERNAL FILLING CONNECTION

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OXYGEN − SERVICING

Servicing of the Oxygen−Replenishing permitted time limit.

Open, safety and tag this circuit breaker:
Warning: KEEP ALL HYDROCARBONS (FUELS, LUBRICANTS, ETC.) 49VU OXYGEN/CREW/OXY/SPLY 1HT HA01
AWAY FROM ALL SOURCE OF OXYGEN. OXYGEN BECOMES
EXPLOSIVE WHEN IT TOUCHES HYDROCARBONS. Aircraft Maintenance Configuration

1. Make sure that the oxygen line end−fittings and the electrical
Warning: OBEY THESE SPECIAL PRECAUTIONS WHEN YOU DO THIS connectors are in the correct condition.
PROCEDURE: 2. Connect the aircraft to ground
3. Connect the filling port to ground.
PREVENT ALL MAINTENANCE PROCEDURES ON THE AIRCRAFT 4. Connect the aircraft oxygen system filling assembly to ground.
(REFUELING,REPAIR OF FUEL AND HYDRAULIC SYSTEMS, USE
OF FLAMMABLE MATERIALS (CLEANING, DEICING, ETC...), Servicing of the Oxygen−Replenishing
CONNECTION/ DISCONNECTION OF THE GROUND POWER
CONNECTOR).
1. Remove the blanking plug from the fill port 5769HM.
MAKE SURE THERE IS NO SMOKING OR FLAME IN A RADIUS OF 2. Connect the filling assembly to the fill port 5769HM.
20 m (66 FT.) OF THE REPLENISHING EQUIPMENT. 3. Measure the cockpit temperature with a termomether.
USE ONLY THE EQUIPMENT WHICH IS SPECIALLY FOR THE 4. Find the filling pressure. To do this, refer to the temperatures and the
OXYGEN SYSTEM. aircraft placards.
CLEAN THE TOOLS AND MAKE SURE YOUR HANDS ARE CLEAN 5. Slowly pressurize the system. Make sure that the filling pressure is
TO PREVENT CONTAMINATION OF THE OXYGEN SYSTEM. correct on the pressure gage of the cylinder.
CAREFULLY OBEY THE REPLENISHING INSTRUCTIONS GIVEN
ON THE AIRCRAFT PLACARDS. Test

Job Set−up Information 1. Remove the safety clip and the tag and close this circuit breaker: 1HT
2. In the cockpit, on the panel 21VU, push the
Aircraft Grounding for the Maintenance Operations OXYGEN/CREW/SUPPLY pushbutton switch. On this pushbutton
Open the access door 812. switch, the OFF legend goes off.
Safety Precautions 3. Make sure that the pressure shown on the filling indicator 5HT is the
same as the pressure gage of the cylinder.
1. Make sure that the overboard discharge indicator shows green.
2. Put the warning notice in the work area to tell persons that the oxygen Put the aircraft back to its initial configuration.
filling operation is dangerous.
3. Make sure that the date of the test given on the cylinder is in the

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OXYGEN SERVICING SCHEMATIC

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PASSENGER OXYGEN SYSTEM PRESENTATION AND

OPERATION

Cabin Organization Triggering

Chemical oxygen units supply oxygen to passengers and cabin attendants. In case of rapid cabin depressurization, oxygen masks are automatically
Demo masks are provided for passenger briefings. The oxygen units are presented to passengers. The chemical generator units provide oxygen for at
installed in the passenger compartment as follows: least 13 minutes.

- above the passenger seats

- in the lavatories
- at the cabin attendant stations.

Two, three or four mask units can be installed on request depending on cabin
layout.

CABIN ORGANIZATION

TRIGGERING

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Automatic Operation Manual Operation

The system operates automatically when the altitude pressure switch closes. The passengers oxygen masks may be presented at any time through a
A taped announcement is transmitted over the passenger address system. MASK MAN ON pushbutton. The taped announcement may be stopped by
The SYS ON white indicator light comes on. The TIME DELAY relays switch pressing momentarily the TMR RESET pushbutton.
off the power supply to the OXYGEN POWER relay after 30 seconds. The
FAULT light on the TMR RESET pushbutton comes on if a failure of the time
delay relays occurs. The taped announcement may be stopped by pressing
momentarily the TMR RESET pushbutton.

AUTOMATIC OPERATION

MANUAL OPERATION

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Reset Manual Release

On ground, used chemical oxygen units must be replaced and all masks
restowed. The system is reset by pressing momentarily the TMR RESET The manual release tools are used to unlock the oxygen container latch.
pushbutton on the maintenance panel. The ON white light comes on while
the TMR RESET pushbutton is pressed.

MANUAL RELEASE

RESET

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PARTS LOCATION

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Passenger Oxygen Unit Operation Chemical Oxygen Unit Operation

As soon as the emergency oxygen container doors open, the masks fall out. The chemical generator uses the basic principal of thermal decomposition of
They are hung on lanyards within the reach of users. When the first user sodium chlorate. An indicator turning from yellow to black shows the
pulls the mask towards his face, the release pin starts the chemical generator is expended. The chlorate core is fitted in a stainless steel housing.
generation. Oxygen flows through the flexible supply hose to the mask. The A thermal insulating material is used between the core and the housing. A
flow indicator shows a green stripe. filter is installed in the outlet end of the housing.

MASK OPERATION CHEMICAL OXYGEN GENERATION

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Oxygen – Chemical Emergency Oxygen Containers – Modification

Tests have shown that the oxygen generators, installed on an identified This Service Bulletin has been issued to inform the operators about the
batch of 22 minute oxygen container assemblies, may come detached by issue of the B/E Aerospace Systems Service Bulletin 1XC22-0100-35-006,
extreme pulling of the mask tube at the end of oxygen supply. This which details the installation of the reinforcement plate.
detachment is caused by the increasing temperature to the end of the The accomplishment of this Service Bulletin will ensure the correct
generator operation, which may weaken the plastic housing in the attachment of the oxygen generators
attachment area of the bracket. Possibly the rivets can slip through the
plastic housing and the generator and the masks can fall down. It is
necessary to install an improved reinforcement plate.

OXYGEN GENERATOR

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Passenger Oxygen Electrical Circuits

When the Cabin Altitude > 14000 ft (16WR closed):

- the Masks are released
- the SYS ON white light comes on
- Public Address is on Mask Releasing

PASSENGER OXYGEN ELECTRICAL CIRCUITS PART 1

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PASSENGER OXYGEN ELECTRICAL CIRCUITS PART 2

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Operational Test

On the emergency oxygen container, pull the door stops down and turn them
90 degrees anti-clockwise to the TEST position. Make sure that these circuit
breakers are closed:

- OXYGEN/PASSENGER ACTUATION 7WR, 6WR, 5WR, 4WR.

- OXYGEN/PASSENGER/CTL AND WARN 3WR, 2WR, 1WR.
- MUSIC TAPE REPRODUCER SYSTEM 2RX.

Energize the aircraft electrical network.

Caution: Do not keep the "Mask Man On" Pushbutton pressed in for more
than 5 seconds.

Lift the switch guard and press the MASK MAN ON pushbutton. On the
oxygen control panel the SYS ON white light comes on. The passenger
address system starts the taped announcement. The oxygen container doors
open until doors stops have been contacted. Press the TMR RESET
pushbutton. The TMR RESET pushbutton ON white light comes on. The
PASSENGER SYS ON light goes off and the taped announcement stops.
Release the TMR RESET pushbutton. Push the container doors to the closed
position until their locks engage. Retract the door stops to the normal
position. Make sure that the MASK MAN ON pushbutton is guarded. De-
energize the electrical circuits. Make sure that the work area is clean and
clear of tools.

OXYPANEL DOOR STOP

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PORTABLE OXYGEN EQUIPMENT

Bottle First Aid Mask

The oxygen source is a high pressure cylinder with a capacity of 310 liters The continuous-flow First Aid oxygen mask provides oxygen for therapeutic
(11 cubic feet). The high pressure cylinders are installed in brackets purposes. The flexible supply hose connects the mask to the calibrated
equipped with quick release clamps. continuous flow outlet of the bottle.

FIRST AID MASK

BOTTLE

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BOTTLE/FIRST AID MASK

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