Airbus 35 A300 A310 Oxygen

AirbusAirbusA300-600/A310-200A300-600/A310-200

Airframe SystemsAirframe Systems33

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For Training Purposes Only

Book 3 - Table of Contents

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A300-600R / A310-200

ATA 35

OXYGEN

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OXYGEN SYSTEM

The oxygen system comprises the crew and courieroxygen system and protective breathing equipment,including associated controls, monitors andindicators. The systems are independent of eachother.

Crew and Courier Oxygen SystemThe system provides adequate oxygen to sustain thecrew in the event of cabin decompression or emissionof smoke and noxious gas. Each crew/courier stationis equipped with a quick-donning mask which has amask-mounted regulator. Oxygen is supplied to themasks from stationary high pressure oxygen cylindersvia pressure regulator/transmitter units, distributionblocks and distribution lines.

Protective Breathing EquipmentProtective breathing equipment is installed for flightcrew members.The equipment is stored in variouslocations in the flight compartment and in the maindeck cargo compartment. It is a self-contained unitwith an oxygen supply. The equipment is used bycrew members in the event of decompression orsmoke or noxious gas emissions.

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FIXED OXYGEN SYSTEM

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GENERAL DESCRIPTION

The crew oxygen system supplies oxygen from agaseous high pressure source to the crew in case ofdecompression or emission of smoke and noxiousgas. The system comprises :

Oxygen StorageOxygen DistributionIndicating

Oxygen StorageThe flight crew oxygen is supplied from four highpressure oxygen cylinders, located forward of theavionics compartment on the right.

Oxygen DistributionOxygen is supplied to the flight compartment crewstations through a supply circuit which includes twooverpressure manifolds, four pressure regulators, twosupply valves, two distribution manifolds, lowpressure supply lines and quick-donning masks.

IndicatingThe indicating system provides control andmonitoring of the oxygen source and supplypressures.

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FIXED OXYGEN SYSTEM

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LOW PRESSURE DISTRIBUTION IN THE COMPARTMENT

A flexible hose connected to the bleed port of the HPtransmitter/regulator assembly, ensures a connectionto a rigid line. A supply solenoid valve which enablesthe downstream distribution system to be supplied orcut off by direct action of the crew on the control andmonitoring panel in the flight compartment. Electricalsupply to the solenoid valve is only applied for afraction of a second corresponding to the opening orclosing time of the valve. This valve is controlled via anelectronic control box 19HT located on shelf 96VU inthe avionics compartment (emergency smokedetection shelf).

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FIXED OXYGEN SYSTEM

E L E C T R O N I C R A C K 9 0 V UE L E C T R O N I C R A C K 9 0 V U

S H E L FNOTE: A310 Oxygen Control Box19HT located aft of engine 1/2 FireDetection Control Boxes on Shelf96VU.

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GENERAL

GeneralThe indicating system provides control and monitoringof the oxygen source and supply pressures.

The system comprises:Cylinder Pressure Gage (Direct Reading) It is possibleto check the cylinder pressure by removing the caseassembly of the storage compartment, by reading ofthe pressure gage on the cylinder valve assembly.This reading is intended for the maintenancepersonnel to check the cylinder pressure.

HP IndicatorEach HP indicator is remotely controlled by thetransmitter incorporated in the high pressure stage ofthe regulator as follows:

Cylinder 1- HP Indicator 6HT/Transmitter 8HTCylinder 2- HP Indicator 48HT/Transmitter 34HTCylinder 3 -HP Indicator 38HT/Transmitter 41HTCylinder 4- HP Indicator 43HT/Transmitter 42HT

It indicates, when the cylinder manual isolation valve isopen, the pressure of the cylinder and the highpressure stage of the regulator. It is graduated in psiand divided into two colored reading bands: Red: 0-85psig Green: 85-2025 psig

LP IndicatorsThe LP indicators are remotely controlled by the LPtransmitters mounted on the low pressure manifoldin the storage compartment as follows :Crew LP indicator 4HT/LP transmitter 31HTCourier LP indicator 49HT/LP transmitter 40HTThey indicate the pressure in the crew and courierdistribution systems. They include colored readingbands, identified clockwise by the following colors,Red: 0 to 38 psig, Amber: 38 to 70 psig, Green: 70to 94 psig, Amber: 94 to 101 psig, Red: over 101psig

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FIXED OXYGEN SYSTEM - INDICATING

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REMOVAL / INSTALLATION

Removal

NOTE

The procedure is identical for the four oxygen cylinders.

CAUTION

WHEN DISASSEMBLED TEMPORARILY, ANY PIPEOR UNIT MUST HAVE THE ENDS PROTECTED BY ADRY AND CLEAN METAL OR PLASTIC PLUG, ANDBE PLACED IN A SEALED VINYL BAG.

On oxygen cylinder(1) Remove pressure regulator by loosening nut .(2) Remove discharge indicator line. Discard sealing ring.(3) Loosen nuts and remove washers on cylinder securing clamps.(4) Remove cylinder.

Preparation of Replacement Component )Make certain that date limit has not been exceededVisually check pressure gage and union threads.

InstallationCAUTION

NO COMPOUND, OTHER THAN SPECIALMATERIAL No.05-003 MUST BE USED ON NUTTHREADS OR ON THE FLARED PORTION OFTHE LINE. THIS COMPOUND MUST BE USEDSPARINGLY ON THE FIRST THREE MALETHREADS. NUTS MUST BE TIGHTENED TO THEREQUIRED TORQUE USING A TORQUEWRENCH ONLY.

(1) Place cylinder carefully on its cradle supports.

(2) Connect pressure regulator. Do not fully tightennut at this stage.

(3) Install new sealing ring and connect discharge indicator line. Do not fully tighten nut at this stage.

(4) Install cylinder securing clamps. Install washers and tighten nut.

(5) Tighten pressure regulator nut.(6) Tighten discharge indicator line union nut

and TORQUE to between 159 and 177 lbf.in.

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OXYGEN CYLINDER

WARNING: Personnel in charge ofcarrying out the actions must beaware of the risks involved inhandling oxygen, which enhancescombustion in the presence offuel and becomes explosive in thepresence of hydrocarbons (fuels,lubricants).

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OVERPRESSURE DISCHARGE MANIFOLDS - DISCHARGEPORT INDICATOR

Each overpressure discharge manifold is providedwithin the storage compartment. The oxygen cylinderoverpressure port and overpressure port of theregulator/transmitter are connected to those safetydischarge manifolds by means of flexible hoses. Atube leads overpressure oxygen from the manifolds tothe outside through a discharge indicator which is flushmounted on the fuselage. The discharge indicatorconsists of a green blow-out disc which keeps thedischarge tube shut. When subjected to pressureexceeding 20 psig the green disc blows out andreveals a yellow colored indication body visible fromoutside of the aircraft.

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OXYGEN CYLINDER

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QUICK DONNING MASKThe quick-donning (less than 5 sec) oxygen maskconsists of:

(a) A harness inflated by a manual control lever, which is used simultaneously to remove the mask from its housing and inflate the harness enabling the mask to be donned.

(b) A demand regulator with the three following functions:- air (oxygen dilution or 100% pure oxygen according to altitude).- 100% oxygen without overpressure.

- 100% oxygen with overpressure.The first two functions are ensured by the NORMAL 100% selector with positive locking onthe 100% position, the last one by an emergencyrotation knob (when pressed: intermittent continuous flow, when turned: continuous flow).

(c) A face piece, which is tightly applied on the face,and includes a high level dynamic type microphone with a built-in preamplifier. Oxygensupply to the mask remains ensured if after removing the mask assembly from the stowagebox, the LH flap is closed again. In this case, awhite flag with OXY ON indication appears to theright of the left flap. In this case, oxygen supplycan be turned off when returning the mask to thestowage box, or even if the mask remains outsidethe stowage box, by momentarily moving the control slide downwards, which prevents the flagfrom appearing.

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QUICK DONNING MASK

A300 Fixed Oxygen System

NOTE: All FedEx A300-600 are modified withthe new EROS type oxygen mask. All FedExA310 series will be modified during the thirdquarter of 2001.

PANEL DOORSOXYGEN FLOWINDICATOR BLINKER(CLOSED)

RESET/TESTCONTROLSLIDE

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STOWAGE BOX

The stowage box houses the mask with deflatedharness and smoke goggles. It comprises:

A connector enabling connection of the flexible hose foroxygen supply to the mask.

A two flap door maintaining the mask in its housing. Theleft flap is provided with a sliding control for operatingan ON/OFF supply valve which releases oxygen to themask regulator when the LH flap is opened. Duringrestowing of the mask, it is necessary to pull on thesliding control to reset the ON/OFF valve in the OFFposition. A white flag, marked OXYGEN, on the slidingcontrol protrudes, thus preventing restowing of themask with the valve in ON position. A rigid stainlesssteel tube connected to the pneumatic ON/OFF supplyvalve assembly. The supply valve assemblyincorporates connector(a). A blinker flowmeter whichflashes when oxygen is flowing. A precoiled flexiblehose for oxygen supply connected to the valve, the freeend of which includes a quick-disconnect connectionwith self-sealing coupling for connection to the relevantsupply pipe of the mask regulator.

A microphone lead tied to the oxygen flexible hose byties and connected at one of its ends to a connectormounted on the box and enabling connection to theaircraft network; the other end is provided with ; quick-disconnect positive locking connector for connection tothe relevant mask microphone supply cable.

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STOWAGE BOX

ACM 1

ACM 2ACM 2

Folding seat onFolding seat onrear wall - LH siderear wall - LH side

NOTE: ACM 1/2oxygen masks arenot EROS MF20type.

EROS MF20

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SMOKE GOGGLES

The smoke goggles are enclosed in a cloth soft bag.They consist of a wide angle lens equipped with anadjustable extra wide fixing headband. The smokegoggles lens is of high grade optics with an anti-abrasion coating on the outside surface and an anti-fogging coating on the inside surface. The wear ofprescription glasses is possible.

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SMOKE GOGGLES

NOTE: Smoke Goggles typeused at Captain and FirstOfficer positions on A310aircraft and A300/A310 ACM 1-2-3 positions in the flightcompartment.

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EMERGENCY OXYGEN

Lavatory Emergency Oxygen

The chemical oxygen generator is a sodium-chloratecore installed in a stainless-steel housing. A thermalinsulating material is used between the core and thehousing. The chemical generator actuator is a spring-loaded striker and a percussion cap installed at oneend of the housing. A pull-pin holds the striker awayfrom the cap. A lanyard connects the pull-pin to theoxygen mask. A filter assembly is installed in the outletend of the housing to prevent contamination of theoxygen supply. A flexible hose connects the oxygenmask to the outlet manifold. The oxygen mask gets itsoxygen supply from the outlet. The outlet is installedon the housing. A relief valve is installed at the outletend of the housing. This will prevent a high pressurebuild-up if a failure of the outlet valve occurs. Atemperature sensitive indicator tape is installed on thehousing. The process of generating oxygen creates afairly high temperature, this causes the indicator tapeto change color from yellow to black. A black indicatortape signals that this chemical oxygen generator hasbeen used. The oxygen mask is a face cone with areservoir bag attached. The inhale, exhale and dilutervalves are installed the face cone. A flow indicator isinstalled in the flexible hose connected to the oxygenmask. The flow indicator will show a green stripe whenthere is an oxygen flow.

The electrical door latch assembly holds the doorof the emergency oxygen container closed.Spring pressure will open the door when theelectrical latch assembly is electrically released.A door stop is installed in the emergency oxygencontainer to permit the inspection and testing forthe emergency oxygen container. The door stopis turned through 90 degrees to permit the doorto open a few degrees and will prevent the maskfrom falling out. The door can be openedmanually with a release tool, via an access holeto release the electrical latch assembly.

The altitude switch closes when the cabinpressure drops to a pressure equivalent of 14000+0/ -500 ft. This operates the emergency oxygensupply system.

The MAN OVRD pushbutton switch (14WR)serves as a backup or override for the altitudeswitching circuit. A safety guard is fitted over theswitch.

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EMERGENCY OXYGEN

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PACK AND RESTOW OXYGEN MASKS

Fold the outer edges of mask bags inwards(lengthwise) to form three equal sections then foldupwards in half. Tuck head bands and mask bagsinto mask face cones. Place masks and coiled supplytubes into the oxygen container.

NOTE: Ensure the oxygen mask tubes are notkinked. Hold masks in place, close and latch door.

TestCarry out an operational test. Replace emergencyoxygen container if door latching mechanismfunctions incorrectly. Replace oxygen generator whenthe indicator plate changes from yellow to black.

Close-UpMake certain that working area is clean and clear oftools and miscellaneous items of equipment.

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PACK AND RESTOW OXYGEN MASKS

FIN 26WR

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CABIN ALTITUDE PRESSURE SWITCH

To access the altitude switch remove the uppersidewall panel in the area of frame #10 at the left sideof the flight compartment. The switch can beremoved by disconnecting the electrical connectorand removing the screws and washers securing it tothe bracket. A test of the switch can be preformed byutilizing a vacuum source and following maintenancemanual procedures.

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CABIN ALTITUDE PRESSURE SWITCH

FWDFWD

FIN 16WRNOTE: Pressure switch FIN16WR also is interfaced withcabin pressurization systemfor low pressurizationconditions

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PORTABLE OXYGEN CYLINDER

The oxygen source consists of a high pressure oxygencylinder. The cylinder is located in the flightcompartment and held in place by quick-releasebrackets. The cylinder has a capacity of 11 cu.ft.charged to 1800 psig at 21°C (70°F). The cylinder isequipped with a valve assembly including the followingcomponents:

(1) A direct reading pressure gage indicating the cylinder pressure.

(2) A high pressure relief valve, with a safety burst disc in case overpressure occurs in the cylinderdue to abnormal rise of temperature. The pressurelimit is 2700 to 3000 psig.

(3) A rotating type ON/OFF valve which controls theoxygen flow entering the high pressure chamberof the pressure regulation mechanism.

(4) A charging valve directly connected to the highpressure chamber of the pressure regulation mechanism and which enables the cylinder to befilled through the ON/OFF valve with a controlledflow. The charging speed must not exceed 300 psi/min.

(5) A pressure control mechanism which ensures pressure regulation to a pressure between 35 and85 psig.

(6) A low pressure relief valve with a check valve calibrated to limit all excessive pressure between 90 psig -beginning of opening and 135 psig -fully open.

(7) A demand regulator enabling an oxygen flow, generated by the negative pressure in the oxygen mask during the inhalation phase, to be obtained from a standard supply point.

(8) A constant flow outlet, not to be used by the flight crew.

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EQUIPMENT

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PROTECTIVE BREATHING HOOD

In the event of fire, smoke or noxious gas emission, aflight crew member uses the protective breathingequipment. The protective breathing hood equipmentworks with a semi-closed circuit. As soon as the "Pullto Activate" ring is disengaged from the unit, lowpressure oxygen is produced by an oxygen generator.Oxygen flows from the generator into a venturi nozzleand mixes with the hood gases while it induces theflow through the CO2 scrubber.

CAUTION

MAKE SURE THAT THE TRANSPARENT BAG ISSEALED AND TIGHT AROUND THE CONTENT. THEHUMIDITY INDICATOR IN THE BAG IS BLUE. DONOT USE THE DEVICE IF THE TRANSPARENTBAG IS NOT CORRECTLY SEALED OR IF THEHUMIDITY INDICATOR IS PINK.

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SMOKE HOOD

Airbus 35 A300 A310 Oxygen

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