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 reservedNo 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) . . . . . . . . . . . . . . . . . . . . . . . . . . 22Passenger Oxygen Unit D/O (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

PORTABLE OXYGEN

Crew Portable Oxygen System D/O (3) . . . . . . . . . . . . . . . . . . . . . . . 34Cabin Portable Oxygen Equipment D/O (3) . . . . . . . . . . . . . . . . . . . 40

MAINTENANCE PRACTICE

Crew Oxygen Cylinder Removal & Installation (3) . . . . . . . . . . . . . . 46

MAINTENANCE COURSE - T1 (V2500-A5/ME) 35 - OXYGEN

TABLE OF CONTENTS May 11, 2006Page 1

SINGLE AISLE TECHNICAL TRAINING MANUALU

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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 isused if there is a loss of cabin pressurization or smoke or dangerous gasesin the cockpit.The oxygen is supplied by a high pressure oxygen cylinder to quickdonning masks in the cockpit.Passenger Oxygen SystemThe passenger and cabin attendant oxygen system is supplied by chemicaloxygen generator units located in the cabin, cabin attendant stations,lavatories and galleys.Two types of chemical generators are offered which provide oxygen for15 minutes or 22 minutes.Portable Oxygen SystemThe portable oxygen system supplies oxygen to the passengers, the cabinattendants and the flight crew in an emergency and for first aid treatment.The smoke hood system provides breathing means and eye protectionfor 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 maskssupplies first aid oxygen for the passengers.


OXYGEN LEVEL 2 (2) May 10, 2006Page 2


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SYSTEM OVERVIEW




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OXYGEN LEVEL 2 (2)

SYSTEM OVERVIEW (continued)

FLIGHT CREW OXYGEN SYSTEMThe flight crew oxygen is supplied from a high-pressure oxygencylinder at a pressure of 127.5 bar (1.850 psig).This cylinder can be isolated for maintenance by a manual ON/OFFvalve.A direct-reading pressure gage gives an indication of the cylinderpressure, independent of the open or closed position of the manualvalve.The cylinder is installed in a cradle with two quick-release clamps inthe L/H avionics compartment.A pressure regulator transmitter assembly is directly connected to thecylinder.It consists of a high-pressure stage with an integrated pressuretransducer 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 CREWSUPPLY P/B on the oxygen panel controls the supply valve.High pressure and low pressure protection is achieved by safetydevices consisting of a high-pressure safety outlet and a low pressuresafety outlet.The high-pressure safety outlet is a frangible disk type. The lowpressure safety outlet is a pressure relief valve.An overboard green discharge indicator is connected to the highpressure safety outlet and to the low pressure safety outlet.In case of over pressure, the green disk blows out and a yellowindicator is displayed showing that the cylinder has discharged or thepressure relief valve has opened.A pressure switch and a test port are connected to the distributionmanifold.

The pressure switch operates when the oxygen supply pressuredecreases to 3.45 plus or minus 0.35 bar (50 plus or minus 5 psig) andtransmits a warning signal REGUL LO PR to the ECAM/DOOR/OXYpage.On the lower ECAM DU, on the DOOR/OXY page, the oxygenpressure 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 lowerthan 1500 psig.If the oxygen pressure drops below the minimum operating pressureof 3.45 plus or minus 0.35 bar (50 plus or minus 5 psig), the indicationREGUL LO PR is shown amber on the DOOR/OXY page.The mask assembly and the stowage box are installed adjacent to eachcrew member seat.The stowage box contains the mask, when the mask is pulled out ofthe box a supply valve installed in the stowage box will open and letoxygen flow to the mask.To use the mask, squeeze the red clips. This will inflate the maskharness.Bring the mask in position and release the red clips.Releasing the red clips will stop oxygen flow to the harness and ventthe 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 SYSTEMThe masks are dropped automatically when the cabin altitude is higherthan 14000 feet or manually by crew action on the MASK MANualON pushbutton.A taped message is transmitted on the passenger address system.The passenger SYStem ON indicator light comes on white when thepassenger oxygen system is electrically supplied.A reset is available to rearm the electrical system after mask restowage.A release tool allows manual opening of the door in case of failure ofthe container door opening system.When the TiMeR RESET pushbutton is pressed, the ON white lightof the TMR RESET pushbutton comes on.The indicator light SYS ON goes off and the taped announcementstops.On ground, used chemical oxygen units must be replaced and allmasks re stowed.The system is reset by momentarily pressing the TMR RESETpushbutton on the maintenance panel.Manually operated doors stops are fitted on the container doors toallow an operational test of the mask release system.When set to test position the door stops will prevent doors from fullyopening 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 SYSTEMThe crew oxygen bottle pressure is indicated on the bottle directreading gage.Correct pressure is shown when the needle is in the FULL range ofthe 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 forpreflight 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 CYLINDERREMOVAL/INSTALLATIONThe oxygen cylinder has to be removed in case of low contents (lowpressure) 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 ANDRESET slider several times to empty the system,- release the OXYGEN/ CREW SUPPLY P/B.Open, safety and tag the OXYGEN/ CREW/OXYgen/ SupPLY circuitbreaker 1HT.Disconnect the pressure regulator transmitter assembly from theoxygen cylinder.Put a blanking cap on the pressure regulator and put it in a sealedvinyl bag.Put an oxygen cylinder cap on the cylinder valve.Disconnect the HP safety hose from the cylinder head; discard thesleeve 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 thecylinder from the support.Make sure that the parts retained from the removed component areclean and in the correct condition.Check the expiration date on the cylinder to make sure it can still beused.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 onthe cylinder head.Remove the blanking cap from the pressure regulator transmitterassembly 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 mechanicalconnections.Very slowly, open the valve of the cylinder 3.5 to 4 turns.Let the pressure become stable, this occurs after approximately 90seconds. 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 otheritems.Close the access door 812.Remove the safety clip and the tag. Close the circuitbreaker 1HT.




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SERVICING - CREW OXYGEN CYLINDER REMOVAL/INSTALLATION




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OXYGEN LEVEL 2 (2)

SERVICING (continued)

SAFETY PRECAUTIONSKeep all hydrocarbons (fuels, lubricants, etc. ) away from oxygensources.Oxygen becomes explosive when it comes in contact withhydrocarbons.Clean the tools and make sure your hands are clean to preventcontamination of the oxygen system.Put dry and clean, metal or plastic plugs on all pipes or units removedtemporarily.Put each pipe or unit in a sealed vinyl bag.

CAUTION: DO NOT PULL THE GENERATOR-END OF THELANYARD.YOU MUST INSTALL THE SAFETY RINGS OR THESAFETY PINS IF YOU:- MOVE THE GENERATORS TO A DIFFERENTLOCATION, OR- PUT THEM INTO STORAGE.IF YOU DO NOT, THE GENERATORS CANOPERATE 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 visualcheck of the crew oxygen cylinder overpressure (Green) discharge discto 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 forinformation.In this case, check the AMM. This is to see if the minimum oxygenpressure available to the flight crew is within the permitted limits.Refer to the minimum flight crew oxygen pressure chart and find theMinimum Pressure according to the ambient temperature and the numberof crew members.If the pressure is less than the minimum flight crew oxygen pressure theoxygen cylinder must be changed.Push the reset test slider, the blinker turns yellow and goes back to blackagain showing that the regulator is leak tight.Press the harness inflation control, the blinker turns yellow and goes backto 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 theUP position.




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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 STOWINGProper stowing of the mask is essential for quick and efficient donningof the mask.Open the stowage box flap doors and position the flexible hosecorrectly.Engage the mask assembly with the regulator on top.Close the left flap door carefully while pushing the reset test slider toretract 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 eachcrewmember seat. The stowage box contains the mask, when the maskis pulled out of the box, a supply valve installed in the stowage box willopen and let oxygen flow to the mask. To use the mask, squeeze the redclips, which will inflate the mask harness; releasing the red clips willstop oxygen flow to the harness and vent the oxygen remaining in theharness to the atmosphere. Oxygen flow is indicated by the blinkershowing yellow and an OXY ON flag, which appears on the left doorwhen closed. The mask regulator provides either normal or pure oxygenby means of a Normal/100% selector. In the Normal position, the userbreathes a mixture of cabin air and oxygen. When the selector is in the100% position, the user will breathe pure oxygen. When the emergencyrotation knob is rotated and the Normal/100% selector in the 100%position, the mask regulator supplies pure oxygen at a permanent positivepressure. To take the mask off, the harness has to be inflated. This is doneby operating the red clips.

STOWAGE

Proper stowing of the mask is essential for quick and efficient donningof the mask. Open the stowage box flap doors, and position the flexiblehose correctly. Engage the mask assembly, regulator on top. Close theleft flap door carefully while pushing the reset test slider to retract theOXY ON flag. At the end of the restowing operation, do the: IN SITUTESTING.Associated film is UM35D1T20S00001.MPG. The above text is fordocumentation only. Do not record this text; do not put it in ATLASmodule.

TESTS

Push the reset test slider. The blinker turns yellow and goes black againshowing that the regulator is leak tight.Press the harness inflation control. The blinker turns yellow and goesblack again showing that the harness is leak tight. The on demand systemis 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 testsare completed, make sure that the Normal/100 % selector is locked inthe 100% position, and the reset test slider return to the UP position.


CREW OXY MASK UTILIZ/STOWAGE/TESTS (2) May 10, 2006Page 20


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UTILIZATION ... TESTS


CREW OXY MASK UTILIZ/STOWAGE/TESTS (2) May 10, 2006Page 21


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PASSENGER OXYGEN SYSTEM D/O (3)

TRIGGERING

In case of rapid cabin depressurization, oxygen masks are automaticallydropped to passengers.Ttwo types of chemical generators are offered which supply oxygen for15 minutes or 22 minutes.


PASSENGER OXYGEN SYSTEM D/O (3) May 10, 2006Page 22


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TRIGGERING




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AUTOMATIC OPERATION

The system operates automatically when the altitude pressure switchcloses. A taped announcement is transmitted over the Passenger Addresssystem and passenger oxygen masks are released. The SYStem ON whiteindicator light comes on. 6 seconds after system activation, relay 25WRis on to interconnect the LH and RH latch assembly electrical circuits.This ensures that all oxygen unit electrical latches remain energized if acircuit is damaged in the event of engine turbine bursting. The TIMEDELAY RELAYS (8WR, 9WR and 15WR) switch off the power supplyto the POWER SUPPLY RELAY after 30 seconds. Pressing momentarilythe TiMeR RESET P/B on the maintenance panel stops the announcementand the indicator light SYS ON goes off.

NOTE: The diagram shows the system when the 30 seconds are notelapsed yet.




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AUTOMATIC OPERATION




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MANUAL OPERATION

The passenger oxygen masks may be presented at any time by pressingthe MASK MAN ON pushbutton. The SYS ON white indicator lightcomes on. 6 seconds after system activation, relay 25WR is on tointerconnect the LH and RH latch assembly electrical circuits. Thisensures that all oxygen unit electrical latches remain energized if a circuitis damaged in the event of engine turbine bursting. Pressing momentarilythe TiMeR RESET P/B on the maintenance panel stops the announcementand the indicator light SYS ON goes off.

NOTE: The diagram shows the system when the 30 seconds are notelapsed 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 masksstowed and oxygen container doors must be latched closed. The systemis reset by momentarily pressing the TMR RESET P/B on the maintenancepanel.




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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 9WRremain 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 theTIME DELAY RELAYS occurs.




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PASSENGER OXYGEN UNIT D/O (3)

MASK OPERATION

As soon as the emergency oxygen container doors open, the masks fallout. They are hung on lanyards within the reach of users. When the firstuser pulls the mask towards his face, the release pin starts the chemicalgeneration. 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 decompositionof sodium chlorate.A thermal indicator shows the generator condition. According to thegenerator 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 firingpin will hit the percussion cap. The heat produced in the percussion capwill then activate the starting powder of the generator.


PASSENGER OXYGEN UNIT D/O (3) May 10, 2006Page 32


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MASK OPERATION ... GENERATOR OPERATION


PASSENGER OXYGEN UNIT D/O (3) May 10, 2006Page 33


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CREW PORTABLE OXYGEN SYSTEM D/O (3)

GENERAL

The crew smoke hood system provides eyes protection and suppliesoxygen to the crew member in case of emergency: fire, or an emissionof smoke or noxious gases. The crew smoke hood system allows freedomof 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 forcabin crew are installed in cabin.


CREW PORTABLE OXYGEN SYSTEM D/O (3) May 10, 2006Page 34


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GENERAL & LOCATION




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DESCRIPTION

The container is installed with a tamper seal and a serviceability indicatorfor the preflight inspection; the serviceability indicator is broken afteropening the box.

NOTE: According to the supplier, another indicator is available whichshows a yellow indicator if the container has not been opened.

The protective breathing hood works with a closed breathing circuit. Thesystem is activated by a starter via a lanyard. The expired air will beregenerated, enriched with oxygen, and inhaled again. The oxygen isgenerated in exothermic chemical reaction between the potassiumperoxide (KO2), the humidity, and the carbon dioxide (CO2) in the expiredair; this reaction releases heat. The protective breathing equipment iscomposed 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 backof the user head,- a relief valve in the hood, which keeps the overpressure in the hood ata 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 headand 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 reliefvalve,- 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 thebox, the hood is removed and the vacuum protection is automaticallyopened 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-pressurecylinders 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 fortherapeutic purposes. The flexible supply hose connects the mask to thecalibrated 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 forone user in case of: fire, or emission of smoke and/or noxious gases. Itlets the user move freely. The smoke hood container is installed with agood-condition indicator and a tamper seal for the pre-flight inspection.The annular container in the hood, full of compressed oxygen, releasesthe amount of oxygen that the user needs. The gas circulation is generatedwhen the user breathes in and out. Cockpit smoke hood container can beoptionally 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 EXPLOSIVE WHEN IT TOUCHESHYDROCARBONS.CLEAN THE TOOLS AND MAKE SURE YOUR HANDSARE CLEAN TO PREVENT CONTAMINATION OF THEOXYGEN 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 avionicsequipment 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 goesoff.- On one of the oxygen masks, actuate the PRESS TO TEST ANDRESET slider several times to empty the system.- Release the OXYGEN/CREW SUPPLY P/BSW. The OFF legendcomes on.- Put a warning notice to tell persons not to push the OXYGEN/CREWSUPPLY 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)

PROCEDURELoosen the nut and disconnect the pressure regulator transmitter fromthe oxygen cylinder.Put a blanking cap on the pressure regulator and put it in a sealedvinyl 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 thecylinder from the support.

INSTALLATION

Make sure that the aircraft is in the same configuration as for the removaloperation.Make sure that the parts retained from the removed component are cleanand in the correct condition.

PROCEDURECheck the expiration date on the cylinder to make sure it can still beused.Carefully put the cylinder on the support, close the clamp and tightenthe 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 transmitterassembly 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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INSTALLATION (continued)

Leak testApply 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 90seconds.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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INSTALLATION (continued)

Close-upRemove the safety clip and the tag and close the circuit breaker.Make sure that the work area is clean and clear of tools and otheritems.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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15T

1M0

- U

M35

Y10

0000

0001

35 oxygen

Education

Transcript of 35 oxygen