A318/A319/A320/A321
TECHNICAL TRAINING MANUAL
M02 RAMP & SERVICING (V2500)
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.
A318/A319/A320/A321 TECHNICAL TRAINING MANUAL
OXYGEN
Oxygen Level 2 (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
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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.
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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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OXYGEN LEVEL 2 (2)
The pressure switch operates when the oxygen supply pressure
SYSTEM OVERVIEW (continued) 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
FLIGHT CREW OXYGEN SYSTEM
page.
The flight crew oxygen is supplied from a high-pressure oxygen On the lower ECAM DU, on the DOOR/OXY page, the oxygen
cylinder at a pressure of 127.5 bar (1.850 psig). pressure in the cylinder is indicated as follows:
This cylinder can be isolated for maintenance by a manual ON/OFF (a) 0 to 27.5 bar (0 to 400 psig) in amber.
valve. (b) 27.5 to 127.5 (400 to 1850 psig) in green.
A direct-reading pressure gage gives an indication of the cylinder (c) An amber half frame appears when the oxygen pressure is lower
pressure, independent of the open or closed position of the manual than 1500 psig.
valve. If the oxygen pressure drops below the minimum operating pressure
The cylinder is installed in a cradle with two quick-release clamps in of 3.45 plus or minus 0.35 bar (50 plus or minus 5 psig), the indication
the L/H avionics compartment. REGUL LO PR is shown amber on the DOOR/OXY page.
A pressure regulator transmitter assembly is directly connected to the The mask assembly and the stowage box are installed adjacent to each
cylinder. crew member seat.
It consists of a high-pressure stage with an integrated pressure The stowage box contains the mask, when the mask is pulled out of
transducer for ECAM indication and a low pressure stage. the box a supply valve installed in the stowage box will open and let
The pressure regulator regulates the low pressure at 4.48 to 6.48 bar oxygen flow to the mask.
(65 to 94 psig). To use the mask, squeeze the red clips. This will inflate the mask
A supply valve opens or closes the crew oxygen supply. The CREW harness.
SUPPLY P/B on the oxygen panel controls the supply valve. Bring the mask in position and release the red clips.
High pressure and low pressure protection is achieved by safety Releasing the red clips will stop oxygen flow to the harness and vent
devices consisting of a high-pressure safety outlet and a low pressure
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the oxygen remaining in the harness to the atmosphere.
safety outlet. Now the mask is ready for use.
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.
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SYSTEM OVERVIEW - FLIGHT CREW OXYGEN SYSTEM
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OXYGEN LEVEL 2 (2)
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
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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)
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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OXYGEN LEVEL 2 (2)
Remove the blanking cap from the HP safety connector.
SERVICING Put a new sleeve on the union and tighten the HP safety connector on
the cylinder head.
CREW OXYGEN CYLINDER
Remove the blanking cap from the pressure regulator transmitter
REMOVAL/INSTALLATION 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. Apply the SPECIAL MATERIAL solution to the mechanical
Put the access platform in position and open the access door 812. connections.
Close the oxygen cylinder ON/OFF valve. Very slowly, open the valve of the cylinder 3.5 to 4 turns.
Bleed and empty the oxygen system: Let the pressure become stable, this occurs after approximately 90
- press the OXYGEN/CREW SUPPLY pushbutton, seconds. Fully open the cylinder valve.
- on one of the oxygen masks, actuate the PRESS TO TEST AND Examine each connection to make sure that there are no leaks.
RESET slider several times to empty the system, Rub off the SPECIAL MATERIAL solution.
- release the OXYGEN/ CREW SUPPLY P/B. Make sure that the work area is clean and clear of tools and other
Open, safety and tag the OXYGEN/ CREW/OXYgen/ SupPLY circuit items.
breaker 1HT. Close the access door 812.
Disconnect the pressure regulator transmitter assembly from the Remove the safety clip and the tag. Close the circuit- breaker 1HT.
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.
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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.
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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.
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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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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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AIRBUS S.A.S.
31707 BLAGNAC cedex, FRANCE
STM
REFERENCE U3Q06181
MAY 2006
PRINTED IN FRANCE
AIRBUS S.A.S. 2006
ALL RIGHTS RESERVED
AN EADS JOINT COMPANY
WITH BAE SYSTEMS
