35 oxygen

SINGLE AISLE
TECHNICAL TRAINING MANUAL
MAINTENANCE COURSE - T1 (V2500-A5/ME)
OXYGEN

This document must be used for training purposes only
Under no circumstances should this document be used as a reference
It will not be updated.
All rights reserved
No part of this manual may be reproduced in any form,
by photostat, microfilm, retrieval system, or any other means,
without the prior written permission of AIRBUS S.A.S.

OXYGEN
GENERAL
Oxygen Level 2 (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
CREW OXYGEN
Crew OXY Mask Utiliz/Stowage/Tests (2) . . . . . . . . . . . . . . . . . . . . 20
PASSENGER OXYGEN
Passenger Oxygen System D/O (3) . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Passenger Oxygen Unit D/O (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
PORTABLE OXYGEN
Crew Portable Oxygen System D/O (3) . . . . . . . . . . . . . . . . . . . . . . . 34
Cabin Portable Oxygen Equipment D/O (3) . . . . . . . . . . . . . . . . . . . 40
MAINTENANCE PRACTICE
Crew Oxygen Cylinder Removal & Installation (3) . . . . . . . . . . . . . . 46
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TABLE OF CONTENTS May 11, 2006
Page 1
SINGLE AISLE TECHNICAL TRAINING MANUAL
U3U06191-U15T1M0

OXYGEN LEVEL 2 (2)
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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OXYGEN LEVEL 2 (2) May 10, 2006
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SYSTEM OVERVIEW
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OXYGEN LEVEL 2 (2)
SYSTEM OVERVIEW (continued)
FLIGHT CREW OXYGEN SYSTEM
The flight crew oxygen is supplied from a high-pressure oxygen
cylinder at a pressure of 127.5 bar (1.850 psig).
This cylinder can be isolated for maintenance by a manual ON/OFF
valve.
A direct-reading pressure gage gives an indication of the cylinder
pressure, independent of the open or closed position of the manual
valve.
The cylinder is installed in a cradle with two quick-release clamps in
the L/H avionics compartment.
A pressure regulator transmitter assembly 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.
The pressure regulator regulates the low pressure at 4.48 to 6.48 bar
(65 to 94 psig).
A supply valve opens or closes the crew oxygen supply. The CREW
SUPPLY P/B on the oxygen panel controls the supply valve.
High pressure and low pressure protection is achieved by safety
devices consisting of a high-pressure safety outlet and a low pressure
safety outlet.
The high-pressure safety outlet is a frangible disk type. The low
pressure safety outlet is a pressure relief valve.
An overboard green discharge indicator is connected to the high
pressure safety 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.
On the lower ECAM DU, on the DOOR/OXY page, the oxygen
pressure in the cylinder is indicated as follows:
(a) 0 to 27.5 bar (0 to 400 psig) in amber.
(b) 27.5 to 127.5 (400 to 1850 psig) in green.
(c) An amber half frame appears when the oxygen pressure is lower
than 1500 psig.
If the oxygen pressure drops below the minimum operating pressure
of 3.45 plus or minus 0.35 bar (50 plus or minus 5 psig), the indication
REGUL LO PR is shown amber on the DOOR/OXY page.
The mask assembly and the stowage box are installed adjacent to each
crew member seat.
The stowage box contains the mask, when the mask is pulled out of
the box a supply valve installed in the stowage box will open and let
oxygen flow to the mask.
To use the mask, squeeze the red clips. This will inflate the mask
harness.
Bring the mask in position and release the red clips.
Releasing the red clips will stop oxygen flow to the harness and vent
the oxygen remaining in the harness to the atmosphere.
Now the mask is ready for use.
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SYSTEM OVERVIEW - FLIGHT CREW OXYGEN SYSTEM
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OXYGEN LEVEL 2 (2)
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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OXYGEN LEVEL 2 (2)
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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OXYGEN LEVEL 2 (2)
SERVICING
CREW OXYGEN CYLINDER
REMOVAL/INSTALLATION
The oxygen cylinder has to be removed in case of low contents (low
pressure) or leakage and replaced by a fully charged cylinder.
Put the access platform in position and open the access door 812.
Close the oxygen cylinder ON/OFF valve.
Bleed and empty the oxygen system:
- press the OXYGEN/CREW SUPPLY pushbutton,
- 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/B.
Open, safety and tag the OXYGEN/ CREW/OXYgen/ SupPLY circuit
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.
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 tighten the nut.
Apply the SPECIAL MATERIAL 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 MATERIAL solution.
Make sure that the work area is clean and clear of tools and other
items.
Close the access door 812.
Remove the safety clip and the tag. Close the circuit- breaker 1HT.
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SERVICING - CREW OXYGEN CYLINDER REMOVAL/INSTALLATION
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OXYGEN LEVEL 2 (2)
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 GENERATORS CAN
OPERATE AND CAUSE DAMAGE.
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SERVICING - SAFETY PRECAUTIONS
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OXYGEN LEVEL 2 (2)
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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DAILY CHECK
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This Page Intentionally Left Blank
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OXYGEN LEVEL 2 (2)
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 (2)
UTILIZATION
The mask assembly and the stowage box are installed adjacent to each
crewmember seat. The stowage box contains the mask, when the mask
is pulled out of the box, a supply valve installed in the stowage box will
open and let oxygen flow to the mask. 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. Oxygen flow is indicated by the blinker
showing yellow and an OXY ON flag, which appears on the left door
when closed. The mask regulator provides either normal or pure oxygen
by means of a Normal/100% selector. In the Normal 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.
TESTS
Push the reset test slider. The blinker turns yellow and goes black again
showing that the regulator is leak tight.
Press the harness inflation control. The blinker turns yellow and goes
black again showing that the harness is leak tight. The on demand system
is tested by pressing the emergency 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 return to the UP position.
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UTILIZATION ... TESTS
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PASSENGER OXYGEN SYSTEM D/O (3)
TRIGGERING
In case of rapid cabin depressurization, oxygen masks are automatically
dropped to passengers.
Ttwo types of chemical generators are offered which supply oxygen for
15 minutes or 22 minutes.
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TRIGGERING
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AUTOMATIC OPERATION
The system operates automatically when the altitude pressure switch
closes. A taped announcement is transmitted over the Passenger Address
system and passenger oxygen masks are released. The SYStem ON white
indicator light comes on. 6 seconds after system activation, relay 25WR
is on to interconnect the LH and RH latch assembly electrical circuits.
This ensures that all oxygen unit electrical latches remain energized if a
circuit is damaged in the event of engine turbine bursting. The TIME
DELAY RELAYS (8WR, 9WR and 15WR) switch off the power supply
to the POWER SUPPLY RELAY after 30 seconds. Pressing momentarily
the TiMeR RESET P/B on the maintenance panel stops the announcement
and the indicator light SYS ON goes off.
NOTE: The diagram shows the system when the 30 seconds are not
elapsed yet.
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AUTOMATIC OPERATION
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MANUAL OPERATION
The passenger oxygen masks may be presented at any time by pressing
the MASK MAN ON pushbutton. The SYS ON white indicator light
comes on. 6 seconds after system activation, relay 25WR is on to
interconnect the LH and RH latch assembly electrical circuits. This
ensures that all oxygen unit electrical latches remain energized if a circuit
is damaged in the event of engine turbine bursting. Pressing momentarily
the TiMeR RESET P/B on the maintenance panel stops the announcement
and the indicator light SYS ON goes off.
NOTE: The diagram shows the system when the 30 seconds are not
elapsed yet.
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MANUAL OPERATION
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RESET OPERATION
When the TMR RESET P/B is pressed, the ON white light comes on.
The indicator light SYS ON goes off and the taped announcement stops.
On ground, used chemical oxygen units must be replaced, all masks
stowed and oxygen container doors must be latched closed. The system
is reset by momentarily pressing the TMR RESET P/B on the maintenance
panel.
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RESET OPERATION
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FAULT OPERATION
When the cabin altitude is more than 14.000 ft and relay 8WR and 9WR
remain open after delay:
- relay 15WR is energized,
- the FAULT amber light comes on,
- the SYS ON white light and Passenger Address systems are still on.
The FAULT light on the TMR RESET P/B comes on if a failure of the
TIME DELAY RELAYS occurs.
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FAULT OPERATION
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PASSENGER OXYGEN UNIT D/O (3)
MASK OPERATION
As soon as the emergency oxygen container doors open, the masks fall
out. They are hung on lanyards within the reach of users. When the first
user pulls the mask towards his face, the release pin starts the chemical
generation. Oxygen flows through the flexible supply hose to the mask.
The flow indicator shows a green stripe.
CHEMICAL OXYGEN GENERATION
The chemical generator uses the basic principal of thermal decomposition
of sodium chlorate.
A thermal indicator shows the generator condition. According to the
generator type, there can be two different indicators:
1- Black: the oxygen generator has been burned out.
- Yellow: the oxygen generator is new.
2- Blue: the oxygen generator has been burned out.
- Pink: the oxygen generator is new.
The chlorate core is fitted in a stainless steel housing.
GENERATOR OPERATION
By pulling the release pin of the starter assembly the spring loaded firing
pin will hit the percussion cap. The heat produced in the percussion cap
will then activate the starting powder of the generator.
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MASK OPERATION ... GENERATOR OPERATION
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CREW PORTABLE OXYGEN SYSTEM D/O (3)
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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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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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 (3)
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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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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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 (3)
REMOVAL
WARNING: KEEP ALL HYDROCARBONS (FUEL, LUBRICANTS,
ETC...) AWAY FROM ALL SOURCE OF OXYGEN.
OXYGEN BECOMES EXPLOSIVEWHEN ITTOUCHES
HYDROCARBONS.
CLEAN THE TOOLSAND MAKE SUREYOUR 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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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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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.
Disconnect the union and discard the bush.
Put a blanking cap on the union.
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
35 - OXYGEN
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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.
35 - OXYGEN
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INSTALLATION - LEAK TEST
35 - OXYGEN
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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.
35 - OXYGEN
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INSTALLATION - CLOSE-UP
35 - OXYGEN
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35 oxygen

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