35-oxygen

A319/A320/A321TECHNICAL TRAINING MANUAL

MECHANICS / ELECTRICS & AVIONICS COURSE

35 OXYGEN

This document must be used for training purpose 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 Industrie.

GENERAL** System Presentation (1) 1.......................

CREW OXYGEN SYSTEM** Crew Oxygen System Presentation (1) 5..........** System Controls and Indicating (1) 9...........Crew OXY Mask Utiliz/Stowage/Tests (2) 13.........Crew Oxygen Components (3) 23......................

PASSENGER OXYGEN SYSTEM** Passenger Oxygen System Presentation (1) 37....** Passenger Oxygen System D/O (3) 43.............** Passenger Oxygen Unit Operation (3) 55.........** Passenger Oxygen Components (3) 63.............** Passenger Electrical Circuit (3) 71............

PORTABLE OXYGEN SYSTEMCrew Portable Oxygen System D/O (3) 87............Cabin Portable Oxygen Equipment D/O (3) 95........

MAINTENANCE PRACTICESCREW SYSTEMOxygen Cylinder R/I (3) 103......................

_A319/A320/A321 TECHNICAL TRAINING MANUAL

35 OXYGENMECHANICS / ELECTRICS & AVIONICS COURSE

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35 - OXYGEN

35-00-00 SYSTEM PRESENTATION

CONTENTS:Crew SystemPassenger SystemPortable SystemSelf Examination

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Page 1EFFECTIVITYALL

SYSTEM PRESENTATION

CREW SYSTEM

The flight crew oxygen system supplies oxygen to theflight crew if there is a loss of cabin pressurization,or a smoke emission.The oxygen is supplied by a high pressure oxygencylinder.

PASSENGER SYSTEM

The passenger and cabin attendant oxygen system issupplied by chemical oxygen generator units.Thechemical generator units provide oxygen forapproximately 13 or 15 minutes.

PORTABLE SYSTEM

The portable oxygen system supplies oxygen to thepassengers, the cabin attendants and the flight crewin an emergency.The smoke hood system provides breathing means and eyeprotection for the crew members and cabin attendants.Itpermits them to move freely to extinguish a fire.The high pressure portable cylinder with continuousflow type masks supplies first aid oxygen for thepassengers.

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SYSTEM PRESENTATION

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SELF EXAMINATION

The crew oxygen system consists of :A - a fixed high pressure cylinder.B - a high pressure portable cylinder.C - a fixed cylinder with masks and a

breathing hood system.

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35 - OXYGEN

35-10-00 CREW OXYGEN SYSTEM PRESENTATION

CONTENTS:HP SourcePressure RegulationOverpressure ProtectionOverpressure IndicationSupply ValveDistributionSelf Examination

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CREW OXYGEN SYSTEM PRESENTATION

HP SOURCE

The crew oxygen source consists of a high pressurecylinder which can be isolated for maintenance, by amanual ON/OFF valve.A direct reading pressure gage gives an indication ofthe cylinder pressure.Cylinder data

- capacity : 3260 l (115 cu ft)- nominal charge : 1850 psig

The cylinder is placed in a cradle and secured by aquick disconnect metallic clamp designed to resist tohigh crash loads.

PRESSURE REGULATION

The pressure regulator transmitter is directlyconnected to the cylinder. It consists of a highpressure stage with an integrated pressure transducerfor ECAM indication and a low pressure stage.The pressure regulator regulates low pressureat 78 8 psig.

OVERPRESSURE PROTECTION

High pressure and low pressure protection is achievedby safety devices consisting of a high pressure safetyoutlet and a low pressure safety outlet.The high pressure safety outlet is of a frangible disktype whereas the low pressure safety outlet is apressure relief valve.The rupture of the frangible disk is set at a cylinderpressure of 2500 to 2775 psig.

The pressure relief valve limits the low pressureoxygen supply to 175 psig.

OVERPRESSURE INDICATION

An overboard green discharge indicator is connectedto the high pressure safety outlet and to the lowpressure safety outlet.In case of overpressure, the green disk blows out anda yellow indicator is displayed showing that thecylinder has discharged or the pressure relief valvehas opened.

SUPPLY VALVE

A supply valve enables downstream distribution by crewaction on the CREW SUPPLY pushbutton on the oxygenpanel.Electrical supply to the valve is applied only for 1.5seconds corresponding to the operating time of thevalve.

DISTRIBUTION

A pressure switch and a test port are connected on thelow pressure manifold.The low pressure switch indicates a low pressuredetection in the LP manifold.It activates a message on the ECAM/DOOR/OXY page.Pressure switch setting : 50 psig.Test port pressure lower than 145 psig.

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CREW OXYGEN SYSTEM PRESENTATION

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SELF EXAMINATION

Can the cylinder pressure be checked when there isno electrical power ?

A - YESB - NO

What indicates an overboard discharge ?A - A warning on the oxygen control panel 21

VU.B - The direct reading pressure gauge on the

oxygen cylinder.C - A yellow indicator.

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35 - OXYGEN

35-10-00 CREW OXYGEN SYSTEM CONTROLS ANDINDICATIONS

CONTENTS:HP In Place Visual IndicationManual IsolationHP IndicationLP ControlLP Warning

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CREW OXYGEN SYSTEM CONTROLS AND INDICATIONS

HP IN PLACE VISUAL INDICATION

The direct reading pressure gage is used to read thecylinder pressure.

MANUAL ISOLATION

The manual ON/OFF valve allows cylinder isolation.The pressure gage reading is available whether themanual valve is open or closed.

HP INDICATION

The HP indication appears on the DOOR/OXY ECAM page.

LP CONTROL

The solenoid supply valve is supplied for a short timeonly, corresponding to the valve operating time.This valve is used to isolate the cylinder from therest of the circuit on ground only.

LP WARNING

The REGULATOR LOW PRESSURE message appears amber onthe ECAM DOOR/OXY page in low pressure conditions only.

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CREW OXYGEN SYSTEM CONTROLS AND INDICATIONS




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35 - OXYGEN

35-11-00 CREW OXYGEN MASK UTILIZATION,STOWAGE AND TESTS

CONTENTS:OperationStowageTests

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CREW OXYGEN MASK UTILIZATION, STOWAGE AND TESTS

OPERATION

The mask assy and the stowage box are installedadjacent to each crew member seat. The stowage boxwhich contains the mask, also controls the flow ofoxygen when the mask is pulled out of the box.To use the mask, squeeze the red clips, which willinflate the mask harness ; releasing the red clipswill stop oxygen flow to the harness and vent theoxygen remaining in the harness to the atmosphere.

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CREW OXYGEN MASK UTILIZATION - STOWAGE AND TESTS - OPERATION

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OPERATION

Oxygen flow is indicated by the blinker showing yellowand an "OXY ON" flag which appears on the left doorwhen closed.In the normal position, the user breathes a mixtureof cabin air and oxygen.When the selector is in the 100 % position, the userwill breathe pure oxygen.To take the mask off, the harness has to be inflated.This is done by operating the red clips.

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CREW OXYGEN MASK UTILIZATION - STOWAGE AND TESTS - OPERATION

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STOWAGE

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

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CREW OXYGEN MASK UTILIZATION - STOWAGE AND TESTS - STOWAGE

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TESTS

Push the reset test slider. The blinker turns yellowand goes black again showing that the regulator isleak tight.Press the harness inflation control. The blinker turnsyellow and goes black again showing that the harnessis leak tight.The on demand system is tested by pressing theemergency rotation knob. The microphone is tested byactivating the loudspeakers, the interphone, and bypressing the emergency rotation knob.When the previous tests are completed, make sure thatthe NORMAL / 100 % selector is locked in the 100 %position, and the reset test slider returns to the UPposition.

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CREW OXYGEN MASK UTILIZATION - STOWAGE AND TESTS - TESTS

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35 - OXYGEN

35-10-00 CREW OXYGEN COMPONENTS

CONTENTS:Safety PrecautionsCylinder Valve AssemblyRegulator TransmitterSolenoid ValveDischarge IndicatorLP ManifoldTest PortStowage BoxesCrew Masks

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CREW OXYGEN COMPONENTS

SAFETY PRECAUTIONS

WARNING: KEEP ALL HYDROCARBONS (FUELS, LUBRICANTS,ETC.) AWAY FROM OXYGEN SOURCES. OXYGENBECOMES EXPLOSIVE WHEN IT COMES IN CONTACTWITH HYDROCARBONS.CLEAN THE TOOLS AND MAKE SURE YOUR HANDS ARECLEAN TO PREVENT CONTAMINATION OF THE OXYGENSYSTEM.

CAUTIONS: PUT DRY & CLEAN, METAL OR PLASTIC PLUGS ONALL PIPES OR UNITS REMOVED TEMPORARILY. PUTEACH PIPE OR UNIT IN A SEALED VINYL BAG.

CYLINDER VALVE ASSEMBLY

IDENTIFICATIONFIN: 5750HM

LOCATIONZONE: 125

DESCRIPTIONThe cylinder valve assembly includes:

- a manual slow opening valve,- a direct reading pressure gage connectedupstream of the manual valve,

- a high pressure safety outlet fitted with afrangible disk.

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CREW OXYGEN COMPONENTS - CYLINDER VALVE ASSEMBLY

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REGULATOR TRANSMITTER

IDENTIFICATIONFIN: 4HT

LOCATIONZONE: 125

DESCRIPTIONThe oxygen pressure regulator/transmitter is screwedto the outlet connection of the cylinder valveassembly.

SOLENOID VALVE

IDENTIFICATIONFIN: 3HT

LOCATIONZONE: 125

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CREW OXYGEN COMPONENTS - REGULATOR TRANSMITTER

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DISCHARGE INDICATOR


LOCATIONZONE: 125

DESCRIPTIONThe green disc will be blown out under an oxygenpressure of 40 to 100 psi, then show a yellow indicator.

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CREW OXYGEN COMPONENTS - DISCHARGE INDICATOR

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LP MANIFOLD


LOCATIONZONE: 125

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CREW OXYGEN COMPONENTS - LP MANIFOLD

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TEST PORT


LOCATIONZONE: 125

DESCRIPTIONThe test port is composed of:

- a body allowing the connection for testing,- an internal filter,- an internal self sealing valve,- a cap (attached with a small chain) toprotect the inlet.

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CREW OXYGEN COMPONENTS - TEST PORT

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STOWAGE BOXES

IDENTIFICATIONFIN: 10RN1, 10RN2, 10RN3, (5774HM)

LOCATIONZONE: 211, 212

DESCRIPTIONThe supply valve is opened either by means of the LHdoor or via the RESET TEST slider.

CREW MASKS

IDENTIFICATIONFIN: 5757HM, 5758HM, 5759HM, (5760HM)

LOCATIONZONE: 211, 212

DESCRIPTIONOne mask is required for each cockpit occupant. Masksfitted at the Captain and First Officer stations musthave serviceable mikes.

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CREW OXYGEN COMPONENTS - STOWAGE BOXES - CREW MASKS

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35 - OXYGEN

35-20-00 PASSENGER OXYGEN SYSTEMPRESENTATION

CONTENTS:LocationLogic

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PASSENGER OXYGEN SYSTEM PRESENTATION

LOCATION

Chemical oxygen units supply oxygen to passengersand cabin attendants.Demo masks are provided for passenger briefings.The oxygen units are installed in the passengercompartment as follows:

- above the passenger seats- in the lavatories- at the cabin attendant stations.

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

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LOGIC

The masks are presented automatically when the cabinaltitude is higher than 14000 feet or manually on crewaction through the MASK MANUAL ON pushbutton.The passenger "SYS ON" indicator light comes on whitewhen the passenger oxygen system is electricallyoperated.A reset is available to rearm the electrical systemafter mask restowage.A release tool allows mechanical opening of the doorin case of failure of the container door openingsystem.

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35 - OXYGEN

35-21-00 PASSENGER OXYGEN DESCRIPTION ANDOPERATION

Contents:TriggeringAutomatic OperationManual OperationReset OperationFault OperationSelf Examination

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PASSENGER OXYGEN DESCRIPTION AND OPERATION

TRIGGERING

The chemical oxygen generator supplies a flow of lowpressure oxygen for a minimum time of 13 or 15 minutes.In case of rapid cabin depressurization, oxygen masksare automatically presented to passengers.

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PASSENGER OXYGEN DESCRIPTION AND OPERATION - TRIGGERING

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AUTOMATIC OPERATION

The system operates automatically when the altitudepressure switch closes.A taped announcement is transmitted over the passengeraddress system.The SYS ON white indicator light comes on.The TIME DELAY RELAYS switch off the power supply tothe OXYGEN POWER RELAYS after 30 s. The announcement may be stopped by pressing momentarilythe TMR RESET pushbutton.

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PASSENGER OXYGEN DESCRIPTION AND OPERATION - AUTOMATIC OPERATION

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MANUAL OPERATION

The passenger oxygen masks may be presented at anytime by pressing the MASK MAN ON pushbutton.The taped announcement may be stopped by momentarilypressing the TMR RESET pushbutton.

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PASSENGER OXYGEN DESCRIPTION AND OPERATION - MANUAL OPERATION

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RESET OPERATION

When the TMR RESET pushbutton is pressed, the ON whitelight of the TMR RESET pushbutton comes on.The indicator light SYS ON goes off and the tapedannouncement stops.On ground, used chemical oxygen units must be replacedand all masks restowed.The system is reset by momentarily pressing the TMRRESET pushbutton on the maintenance panel.

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PASSENGER OXYGEN DESCRIPTION AND OPERATION - RESET OPERATION (A/C ON GROUND)

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FAULT OPERATION

When the cabin altitude is more than 14000 FT and relay8WR and 9WR remain open after delay:

- Relay 15WR is energized- The Fault amber light comes on- The SYS ON white light and Public Addresssystems are still on

The FAULT light on the TMR RESET pushbutton comes onif a failure of the TIME DELAY RELAYS occurs.

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PASSENGER OXYGEN DESCRIPTION AND OPERATION - FAULT OPERATION

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SELF EXAMINATION

How do the time delay relays control the pax systemautomatic operation ?

A - They cut off electrical supply after 30seconds.

B - They supply the system for 3 seconds.C - They supply the system after 30 seconds.

The TMR RESET FAULT light comes on if:A - The reset operation is not yet completed.B - The reset operation has failed.C - The time delay relays have failed during

the automatic operation.

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35 - OXYGEN

35-20-00 PASSENGER OXYGEN UNIT OPERATION

CONTENTS:Mask OperationChemical Oxygen GenerationGenerator Operation

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PASSENGER OXYGEN UNIT OPERATION

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 themask.The flow indicator shows a green stripe.

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PASSENGER OXYGEN UNIT OPERATION - MASK OPERATION

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CHEMICAL OXYGEN GENERATION

The chemical generator uses the basic principal ofthermal decomposition of sodium chlorate.An indicator turning from yellow to black shows thegenerator is expended.The chlorate core is fitted in a stainless steelhousing.A thermal insulating material is used between the coreand the housing.A filter is installed in the outlet end of the housing.

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PASSENGER OXYGEN UNIT OPERATION - CHEMICAL OXYGEN GENERATION




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GENERATOR OPERATION

The generator actuator consists of a spring-loadedstriker and a percussion fuse.A relief valve fitted on the generator housing protectsthe generator against high internal pressure.

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PASSENGER OXYGEN UNIT OPERATION - GENERATOR OPERATION

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35 - OXYGEN

35-20-00 PASSENGER OXYGEN COMPONENTS

CONTENTS:Altitude Pressure SwitchChemical Emergency Oxygen ContainerDoor StopContinuous Flow Mask

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PASSENGER OXYGEN COMPONENTS

ALTITUDE PRESSURE SWITCH

IDENTIFICATIONFIN: 16WR

LOCATIONZONE: 127

COMPONENT DESCRIPTIONThe altitude pressure switch closes when the cabinpressure decreases to a pressure equivalent to 14.000feet. This action operates the emergency oxygen system.The pax oxygen system automatic control may beinoperative provided that the aircraft altitude islimited to 30.000 feet.

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PASSENGER OXYGEN COMPONENTS - ALTITUDE PRESSURE SWITCHT MU

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CHEMICAL EMERGENCY OXYGEN CONTAINER

LOCATIONZONE: 200

COMPONENT DESCRIPTIONEach oxygen container comprises:

- a container box,- a door fitted with a latch assembly,- a door stop,- a chemical emergency oxygen container,

continuous flow oxygen masks with flexible supplyhoses.

DOOR STOP

LOCATIONZONE: 200

COMPONENT DESCRITPIONThe door stop is installed in the emergencyoxygen-container.The door stop allows an inspection and a test of theemergency oxygen-container door opening to beperformed. The door stop allows the door to open by afew degrees. To open the door manually, you can releasethe electrical latch assembly with a manual releasetool.

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PASSENGER OXYGEN COMPONENTS - OXYGEN UNIT

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CONTINUOUS FLOW MASK

LOCATIONZONE: 200

COMPONENT DESCRIPTIONWhen the first user pulls the mask towards his face,the release pin starts the chemical oxygen generation.Oxygen flows through the flexible hose to the mask.The flow indicator inflates when the oxygen flows.

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PASSENGER OXYGEN COMPONENTS - OXYGEN UNIT

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35 - OXYGEN

35-23-00 PASSENGER OXYGEN SYSTEMELECTRICAL CIRCUIT

CONTENTS:Manual Mask ReleasingAutomatic Mask ReleasingOxygen Unit DeactivationFault Light OnReset Operation

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EFFECTIVITY 35-23-00 Page 1Apr 30/00



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PASSENGER OXYGEN SYSTEM ELECTRICAL CIRCUIT

MANUAL MASK RELEASING

THE MASK MAN ON PUSHBUTTON IS PRESSED :- the masks are released- the SYS ON white light comes on- Public Address is on

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PASSENGER OXYGEN SYSTEM ELECTRICAL CIRCUIT - MANUAL MASK RELEASING

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Manual Mask Releasing

6 Seconds after system activation, relay 25WR is onto interconnect the LH and RH latch assembly electricalcircuits.This ensures that all oxygen unit electrical latchesremain energized if a circuit is damaged in the eventof engine turbine bursting.

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PASSENGER OXYGEN SYSTEM ELECTRICAL CIRCUIT - MANUAL MASK RELEASING

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AUTOMATIC MASK RELEASING

CABIN ALTITUDE IS MORE THAN 14000 FT (16WR CLOSED) :- the masks are released - the SYS ON white light comes on - Public Address is on

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PASSENGER OXYGEN SYSTEM ELECTRICAL CIRCUIT - AUTOMATIC MASK RELEASING

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AUTOMATIC MASK RELEASING

6 Seconds after system activation, relay 25WR is onto interconnect the LH and RH latch assembly electricalcircuits.This ensures that all oxygen units electrical latchesremain energized if a circuit is damaged in the eventof engine turbine bursting.

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PASSENGER OXYGEN SYSTEM ELECTRICAL CIRCUIT - AUTOMATIC MASK RELEASING

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OXYGEN UNIT DEACTIVATION

CABIN ALTITUDE IS MORE THAN 14000 FT (16WR CLOSED) :- 30 Seconds after mask activation, theoxygen unit door latches are deactivated.SYS ON white light and Public Addresssystem will remain energized.

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PASSENGER OXYGEN SYSTEM ELECTRICAL CIRCUIT - OXYGEN UNIT DEACTIVATION

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FAULT LIGHT ON

CABIN ALTITUDE IS MORE THAN 14000 FT AND RELAY 8WR AND9WR REMAIN OPEN AFTER A TIME DELAY:

- Relay 15WR is energized - The FAULT amber light comes on - The SYS ON white light and Public Adresssystem are still on

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PASSENGER OXYGEN SYSTEM ELECTRICAL CIRCUIT - FAULT LIGHT ON

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RESET OPERATION

ON GROUND AND TMR RESET PUSHBUTTON IS PRESSED:- Electrical supply to relays 8WR/9WR/19WR/6LPis cut off

- ON white light comes on as long as the resetpushbutton is pressed

- SYS ON white light and Public Addresssystem are off

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PASSENGER OXYGEN SYSTEM ELECTRICAL CIRCUIT - RESET OPERATION

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35 - OXYGEN

35-31-00 CREW PORTABLE OXYGEN SYSTEMDESCRIPTION AND OPERATION

CONTENTS:GeneralLocationDescriptionOperationSelf Examination

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CREW PORTABLE OXYGEN SYSTEMDESCRIPTION AND OPERATION

GENERAL

The crew smoke hood system provides eyes protectionand supplies oxygen to the crew member in case ofemergency :fire, or an emission of smoke and/or noxiousgases.The crew smoke hood system allows freedom of movementto extinguish a fire. It can also be used as anemergency-oxygen supply if the fixed emergency-oxygensystem does not work.

LOCATION

The smoke hood is vacuum packed in a transport/storagecontainer.The crew smoke hoods are installed in the cockpit inthe first officers console (702VU).Smoke hoods for cabin attendants are installed in thecabin.

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CREW PORTABLE OXYGEN SYSTEM DESCRIPTION AND OPERATION

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DESCRIPTION

The hood is fire resistant and has an autonomy of 15minutes.The container is provided with a good conditionindicator, normally green (red : hood unserviceable),and a tamper seal used for the preflight inspection.

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OPERATION

When doned, the automatic start lever connected to theannular container, releases the compressed oxygenstored inside the container.Then, the oxygen fills up the compartment between theexternal and the internal hood.During inhalation, the oxygen flows to the innercompartment through the absorption system.During exhalation, the absorption system traps thecarbon dioxyde contained in the expired gas through alayer of soda lime.A pressure control valve prevents an increase ofpressure in the hood.A phonic membrane allows the user to communicateeasily.NOTE :

- A slight noise of oxygen flow is heard bythe wearer during operation.When the noise of oxygen flow stops, thehood should no longer be used.

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SELF EXAMINATION

What is the function of the hood absorptionsystem ?

A - To add oxygen to the expired gas.B - To trap the carbon dioxyde contained in

the expired gas.C - To allow the expired gas to flow out of

the hood.

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35 - OXYGEN

35-32-00 CABIN PORTABLE OXYGEN EQUIPMENTDESCRIPTION/OPERATION

CONTENTS:BottleFirst Aid MaskSmoke Hood System

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CABIN PORTABLE OXYGEN EQUIPMENTDESCRIPTION/OPERATION

BOTTLE

The oxygen source is a high pressure cylinder with acapacity of 310 liters (11 cubic feet).The high pressure cylinders are installed in bracketsequipped with quick release clamps.

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CABIN PORTABLE OXYGEN EQUIPMENT DESCRIPTION/OPERATION

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FIRST AID MASK

The continuous-flow first aid oxygen mask providesoxygen for therapeutic purposes.The flexible supply hose connects the mask to thecalibrated continuous flow outlet of the bottle.

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SMOKE HOOD SYSTEM

The smoke hood system provides breathing means andeyes protection for one user in case of emergency:fire, or an emission of smoke and/or noxious gases.It permits him to move freely.The smoke hood container is provided with agood-condition indicator and a tamper seal for thepre-flight inspection.The annular container in the hood, full of compressedoxygen, releases the amount of oxygen that the userneeds.The gas circulation is generated when the user breathesin and out.

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35 - OXYGEN

35-11-41 OXYGEN CYLINDER -REMOVAL/INSTALLATION

CONTENTS:PrecautionsRemovalInstallation

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EFFECTIVITY 35-11-41 Page 1May 31/96



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OXYGEN CYLINDER

PRECAUTIONS

WARNING :KEEP ALL HYDROCARBONS (FUEL, LUBRICANTS, ETC...) AWAYFROM ALL SOURCE OF OXYGEN. OXYGEN BECOMES EXPLOSIVEWHEN IT TOUCHES HYDROCARBONS.CLEAN THE TOOLS AND MAKE SURE YOUR HANDS ARE CLEAN TOPREVENT CONTAMINATION OF THE OXYGEN SYSTEM.

CAUTION :PUT DRY AND CLEAN, METAL OR PLASTIC PLUGS AN ALL PIPESOR UNITS REMOVED TEMPORARILY.PUT EACH PIPE OR UNIT IN A SEALED VINYL BAG.

REMOVAL

Put the access platform in position and open the accessdoor 812.The oxygen cylinder has to be removed in case of lowcontent or leakage. Close the oxygen cylinder ON/OFFvalve.Energize the aircraft electrical circuits ; make surethat the avionics equipment ventilation operatescorrectly.Check that the OXYGEN/CREW/OXY/SPLY circuit-breaker 1 HT is closed.Bleed and empty the oxygen system:

- press the OXYGEN/CREW SUPPLY pushbutton.- On one of the oxygen masks, actuate the PRESSTO TEST AND RESET slider several times to emptythe system.

- release the OXYGEN/CREW SUPPLY pushbutton.- open, safety and tag the OXYGEN/CREW/OXY/SPLYcircuit breaker 1 HT.

Loosen the nut and disconnect the pressure regulatortransmitter assembly from the oxygen cylinder.Put a blanking cap on the pressure regulator and putit 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 cylindervalve.Loosen the nut and disengage the pin from the clampto remove the cylinder from the support.

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OXYGEN CYLINDER - REMOVAL

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OXYGEN CYLINDER

INSTALLATION

Make sure that the aircraft is in the sameconfiguration as for the removal operation.Open and tag the circuit-breaker:

- OXYGEN/CREW/OXY/SPLY 1 HTMake sure that the parts retained from the removedcomponent are clean and in the correct condition.Check the expiration date on the cylinder to make sureit can still be used.

NOTE: No compound, except SPECIAL MATERIALS must beused on nut threads or on the flared portion ofthe tube. This compound should be used sparinglyon all first three male threads.

Carefully put the cylinder on the support.Close the clamp and tighten the pin.Remove the oxygen cylinder stowage cap from thecylinder valve.Remove the blanking cap from the HP safety connector.Put a new sleeve on the union and tighten the HP safetyconnector on the cylinder head.Remove the blanking cap from the pressure regulatortransmitter assembly and the corresponding stowage capon 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 to4 turns.Let the pressure become stable, this occurs afterapproximately 90 seconds. Fully open the cylindervalve.

Examine each connection to make sure that there areno leaks.Rub off the SPECIAL MATERIAL solution.Make sure that the work area is clean and clear oftools and other items.Close the access door 812.Remove the access platform.De-energize the aircraft electrical circuits.Remove the safety clip and the tag.Close the circuit-breaker 1 HT.

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OXYGEN CYLINDER - INSTALLATION

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Table of contentsGENERAL** System Presentation (1)

CREW OXYGEN SYSTEM** Crew Oxygen System Presentation (1)** System Controls and Indicating (1)Crew OXY Mask Utiliz/Stowage/Tests (2)Crew Oxygen Components (3)

PASSENGER OXYGEN SYSTEM** Passenger Oxygen System Presentation (1)** Passenger Oxygen System D/O (3)** Passenger Oxygen Unit Operation (3)** Passenger Oxygen Components (3)** Passenger Electrical Circuit (3)

PORTABLE OXYGEN SYSTEMCrew Portable Oxygen System D/O (3)Cabin Portable Oxygen Equipment D/O (3)

MAINTENANCE PRACTICESCREW SYSTEMOxygen Cylinder R/I (3)

35-oxygen

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