35 Oxygen

Single Aisle TECHNICAL TRAINING MANUAL

M35 LINE MECHANICS (IAE V2500/ME) (Lvl 2&3) 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) . . . . . . . . . . . . . . . . . . . . 16Passenger Gaseous Oxygen SYS D/O (option) (3) . . . . . . . . . . . . . . 18

PORTABLE OXYGEN

Crew Portable Oxygen System D/O (3) . . . . . . . . . . . . . . . . . . . . . . . 30Cabin Portable Oxygen Equipment D/O (3) . . . . . . . . . . . . . . . . . . . 36

MAINTENANCE PRACTICE

Crew Oxygen Cylinder Removal & Installation (3) . . . . . . . . . . . . . . 42

M35 LINE MECHANICS (IAE V2500/ME) (Lvl 2&3) 35 - OXYGEN

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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 Portable Breathing Equipment (PBE) provides breathing means andeye 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 maskssupplies first aid oxygen for the passengers.


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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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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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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 PBE 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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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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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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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.


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PASSENGER GASEOUS OXYGEN SYS D/O (OPTION) (3)

GENERAL

The passenger gaseous oxygen system supplies oxygen to each oxygencontainer in case of an emergency. The rate of the oxygen flow dependson the altitude. The oxygen supply starts automatically at a cabin pressureequivalent to an altitude exceeding 14.000 ft (4.265 m) and stops whenthe cabin pressure drops below a pressure equivalent to 10.000 ft (3.050m). The system can than be re-started if the aircraft has to climb to clearanother obstacle. The gaseous oxygen system has no characteristic flightprofile. Since the flow is greater with the altitude, the lower the flight isdone the longer the oxygen supply lasts.

SYSTEM DESCRIPTION

High-pressure oxygen is stored in oxygen cylinder assemblies locatedbehind sidewall linings RH in the AFT cargo compartment. The standardsystem has 6 oxygen cylinders. Up to 8 oxygen cylinders can be installedat the airline request. When the system is operated, low-pressure oxygenfrom the pressure reducers is supplied to the two main supply lines. Oneline is installed below the cabin floor along the LH side of the aircraft.The other line is installed above the cabin ceiling. Riser Lines (RLs) areinstalled at approximately every 4 frames to connect the overheaddistribution lines. These are connected to the emergency oxygencontainers and to the main supply lines.

OPERATION AND COMPONENTS DESCRIPTION

COMPONENTS

Oxygen Cylinder Assembly

The high-pressure oxygen cylinder is made of a composite material.It has the capacity of 3310 liter (116.9 cubic feet (cuft)) at a pressureof 127.5 bar (1850 psig). The cylinder head valve assembly is madeof:

- a slow-opening Shutoff Valve (SOV) used to isolate the oxygen inthe cylinder from the oxygen system,- a direct-reading pressure gage, which will give an indication of thecylinder pressure,- a high-pressure safety outlet with a burst disc,- an inlet/outlet port.

Oxygen Pressure Reducer

The oxygen pressure reducer transmitter assembly is directly connectedto the inlet/outlet port of the oxygen cylinder assembly and reducesthe cylinder pressure to the intermediate pressure of 7.6 ± 0.7 bar (110± 10 psig). The outlet of the oxygen pressure reducer is connectedwith the intermediate pressure line.

Thermal Compensators

The thermal compensators prevent dangerous increases of temperatureduring replenishment of oxygen cylinder. They are installed in thehigh-pressure line (fill line) immediately in front of the pressurereducers.

Temperature Transducer

The temperature transducer measures the ambient temperature in theinstallation area of oxygen cylinders and generates a related electricalsignal sent to the Quantity Calculation and Control Unit (QCCU) forthe computation.

Oxygen Filling Port

The oxygen filling port enables the connection of an oxygen groundfilling equipment for cylinders replenishing. The oxygen filling porthas:- a flow restrictor to ensure safe pressure rises,- a filter to prevent contamination of the system,- an external cap with a safety chain.

Intermediate Line Low Pressure Switch


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The low-pressure switch is installed in the intermediate pressure linebetween the pressure reducers and the oxygen regulators. If thepressure in the intermediate pressure line is not sufficient, thelow-pressure switch generates a warning signal on the PassengerOxygen Indication Panel (POXIP) in the cockpit overhead panel. Thedecreasing pressure is 6.9 bar (100 psi) and the increasing pressure is5.5 ± 0.7 bar (80±10 psi).

Pressure Oxygen Regulators

Two redundant Pressure Oxygen Regulators (PORs) are installed inthe intermediate pressure line. Each regulator operates the systemindependently from the other. The POR integrates a motor drivenSOV, which moves to the position necessary to obtain the correctpressure in the Main Distribution Lines (MDL) and to give the correctflow to the oxygen masks.

Test Ports

The system has three identical test ports. One is installed in theintermediate pressure line and the other two are installed in thelow-pressure distribution network. These test ports enable to connecta test tool for leakage, pressure tests, system function, and pressurerelease of the distribution network after installation or removal ofsystem components.

Bleed/Vent Valve

The bleed vent valve is installed at the most FWD point of MDLlocated in the ceiling. After system activation, the valve opens forapproximately 5 seconds to allow the air/oxygen mixture containedin the distribution network to be released out of the MDLs and thesystem is purged. The bleed vent valve contains an orifice, whichallows a small amount of oxygen to escape from the distributionsystem. The bleed vent valve also contains a filter protecting theoxygen system from contamination.

Shutoff Valves (SOV)

The system has two MDLs SOVs, which are pneumatically controlled.One MDL SOV is installed in the ceiling main distribution line justAFT of the rim release area. The other MDL SOV is installed in theunder floor MDL just AFT of the rim release area. During normalsystem operation both MDL SOVs are open in flow direction. Thereare also two SOVs per riser line installed in the engine burst area.They are installed immediately after the connection with the mainsupply line. In normal operation, the riser line SOVs are open. If theriser line is damaged, the riser line SOVs close automatically.

Check Valves

The system has two check valves installed. One check valve is installedin the ceiling MDL just FWD of the engine burst area. The other checkvalve is installed in the under floor MDL just FWD of the engine burstarea. In normal operation, the check valves are open. When a mainline is damaged due to uncontained engine rotor failure, the checkvalve closes.

Oxygen Container Assemblies

There are different oxygen container assemblies for the differentinstallation places in the aircraft cabin. These assemblies are differentin length and width. Each type of container can have different numbersof masks. For each mask, there is a flow restrictor and a SOV activatedautomatically by a lanyard. To carry out the interface requirementsof the aircraft the following different oxygen container types arerequired:- type I to be installed in the doorframe lining for supplying 2 to 4persons with oxygen (LH and RH container),- type II to be installed in sidewalls, low ceilings, lavatories and galleysfor supplying 2 persons with oxygen.An oxygen container assembly is mainly composed of:- a container housing,- a container door (spring loaded for type II, type I not spring loaded),- a door stop/test button device,- an inlet port inclusive filter,




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- a pneumatic door latch including a lever for manual opening,- a manifold with individual outlets having SOV integrated for eachmask connection,- an oxygen mask assembly,- a flow indicator for each oxygen mask,- a distribution tube from inlet port to manifold and to the pneumaticdoor latch,- a lanyard to activate the flow to each individual mask.

AUTOMATIC MODEWhen the cabin pressure decreases to a pressure equivalent to 14.000ft + 0/- 500 ft (4.265 m) the altitude switch closes. This starts theautomatic operation of the oxygen system. The Pressure OxygenRegulators (PORs) open fully to purge the Main Distribution Line(MDL), measure the cabin altitude of the A/C and the pressure in thedistribution network. The POR adjusts the pressure in the distributionline to the required oxygen pressure in order to obtain the correct flow.The POR does not require any software.

MANUAL MODEIf the altitude SW fails, the MASK MANual ON P/B can be pushedat any time to start the operation of the oxygen system. The MASKMAN ON P/B sends a signal to open the PORs and low-pressureoxygen is supplied. The bleed/vent valve first bleeds the remainingair in the lines and then closes to let the system fill with oxygen. TheSYStem ON light comes on as soon as one POR is open. Anemergency announcement is transmitted over the passenger addresssystem. The oxygen masks container doors open pneumatically andthe masks fall. Oxygen only flows to the masks, which are pulleddown.

RESETThe OXYGEN TiMeR RESET P/BSW is used to reset the electricalcircuit after the system operation. When the OXYGEN TMR RESETP/BSW is pushed and the cabin altitude is less than 14.000 ft ± 500

ft, the oxygen regulators will close and the SYS ON indication willturn off when the pressure in the distribution system decreases below4,5 ± 0,5 kPa (0,045 ± 0,005 bar).

NOTE: The main distribution SOVs of the A319 gaseous oxygensystem are pneumatically operated valves, not motorized.They will remain in the closed position as long as a pressuredifference is valid in the MDL.




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OVERPRESSURE PROTECTION

OXYGEN CYLINDERTo protect the cylinder from overpressure, the oxygen cylinder has ahigh-pressure safety outlet with a burst disc. The burst disc will ruptureat a pressure of 169 bar at a temperature of 71 °C (160 °F) and 191bar at a temperature of 21 °C (70°F). The oxygen will be dischargedoverboard.

PRESSURE RELIEF VALVEA pressure relief valve is installed between the intermediate pressureline and the overboard discharge line. It is a double redundant safetyvalve. The inlet port of the pressure relief valve is connected with theintermediate pressure line. If the pressure in the intermediate pressureline exceeds 9.7 ± 0.7 bar (140 ± 10 psig), the valves will open. Theoverpressure can then discharge via the overboard discharge line. Therelief valve closes when the pressure decreases below 8.3 bar (120psig). For redundancy functions, two valves are arranged in series toprevent system pressure loss if one valve fails to close. Two serialvalve devices are arranged in parallel.

OVERBOARD DISCHARGE INDICATORThe overboard discharge indicator makes a continuous surface withthe outside skin of the aircraft. It has a fluorescent green burst diskand a yellow housing. The burst disk of each oxygen cylinder and thesafety outlet of the pressure relief valve are connected via theoverboard discharge line with the overboard discharge indicator. Incase of an overpressure in the high or in the intermediate pressurepart, the green burst disk is moved and a reflective yellow area of thedischarge indicator is presented.

ENGINE BURST / RIM RELEASE PROTECTION

Damage to Main Distribution Line (MDL):

- in case of damage to a part of the MDL due to engine burst failure orrim release, the surge flow in the damaged MDL part will induce theSOV in the damaged part of the MDL to close. The reverse flow checkvalve on the damaged part of the MDL will also close in order to seal thedamaged region.- the surge pressure increases and when the door latch actuation pressure(1.5 bar - 3.0 bar) is achieved, the doors of the oxygen containerassemblies supplied by the undamaged part of the MDL will be released.The oxygen mask assemblies fall out and hang from the lanyards in frontof the users. After a certain time the bleed valve closes automatically.Damage to Riser Line (RL):- in case of damage to a RL due to engine burst failure or rim release, thesurge flow in the damaged RL part will induce the SOV in the RL toclose.- the surge pressure increases and when the door latch actuation pressure(1.5 bar - 3.0 bar) is achieved, the doors of the oxygen container will bereleased (except the doors of the oxygen containers in the damaged RL).The oxygen mask assemblies fall out and hang from the lanyards in frontof the users. After a certain time the bleed valve closes automatically.




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CONTROL & INDICATION

ALTITUDE PRESSURE SWITCHThe altitude switch, which is installed in the avionics compartment,starts the automatic operation of the passenger oxygen system. It sendsa signal to open the oxygen regulators, which supply low-pressureoxygen to the oxygen distribution system. In case of high altitudeairfield operation option, the altitude switch has two settings:- the first setting closes, if the pressure falls to a value equivalent to14000 +0 -500 ft. (4267.12 +0.00 -152.39 m),- the second setting closes, if the pressure falls to a value equivalentto 16000 +0 -500 ft. (4876.71 +0.00 -152.39 m).

NOTE: If high altitude airfield operation is required, the system canbe adapted by using a dual altitude pressure switch and byadapting the activation circuit.

OXYGEN CONTROL PANELOn the oxygen control panel, the MASK MAN ON P/BSW allowsthe crew to activate the oxygen system as a backup and override thealtitude pressure switch. The oxygen regulators stay open even if theMASK MAN ON P/BSW is released. When the OPEN relays do notoperate, it is necessary to hold the MASK MAN ON P/BSW for 1second to open the oxygen regulators.A safety guard is installed over the MASK MAN ON P/BSW has toprevent accidental operation of the system. The SYS ON indicatorlight on the overhead panel comes on when at least one pressureoxygen regulator is open. When the pressure in the system decreasesthe SYS ON indicator light goes off.

TMR RESET P/BSWThe TMR RESET P/BSW is installed on the maintenance panel andallows the reset of the controls after the system operation. When theTMR RESET P/BSW is pushed:- the electrical circuit is set to the normal condition,- the oxygen regulators close.In this case the ON light comes on and stays on for 5 seconds. It doesnot go off if the electrical circuit for the oxygen system does not resetto the correct condition.

POXIPThe monitoring of the gaseous oxygen system has indications andwarnings, which are displayed to the cockpit crew on the POXIP andby a white PASSENGER SYS ON light. The maintenance messagesare not recorded automatically. The flight crew reports the failuresrequiring a maintenance task. Some failure messages are displayedon the QCCU itself.The REGULator LOw PRessure indicator light comes on amber if:- the pressure in the intermediate line of the oxygen system is too low,- the LP switch does not operate.The REGUL SYS1 and/or REGUL SYS2 indicator light(s) come(s)on when:- there is a power loss for the pressure regulator(s),- the system is active and the oxygen regulator is fully closed,- the system is not active and the oxygen regulator is not fully closed,- there is an internal error of the oxygen regulator.The CYLINDER FAULT indicator light comes on amber when themanual SOV of a minimum of one oxygen cylinder is not fully open.The oxygen filling pressure is indicated in the PRESSURE display.When the pressure in the cylinder assemblies is less than 110.3 bar(1600 psi), the CHECK indicator light comes on amber and the LOindicator light comes on amber when this pressure is less than 13.8bar (200 psi).




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When the oxygen filling pressure is not available or out of range, thepressure value in the PRESSSURE display is replaced by "- -".

QCCUThe Quantity Calculation and Control Unit (QCCU) monitors theoxygen pressure in the installed oxygen cylinders. The QCCU receivessignals from:- the pressure transmitters integrated in each pressure reducer,- the temperature transducer.The QCCU sends a signal of the arithmetic mean pressure of theinstalled oxygen cylinders to the fill panel indicator and a temperatureadjusted pressure to the POXIP. The QCCU also sends a signal to thePOXIP if:- the QCCU does not operate,- the signal from the temperature transducer is not in the range or isnot continuous,- the signal from one or more of the pressure transducers is not in therange or is not continuous.The QCCU has 3 warning lights at its front face:- PRESSURE,- TEMPERATURE,- COMPUTER.These lights come on if there is a fault in the appropriate signal to theQCCU. A TEST P/B enables to make a light test on the unit. Twoswitches enable the display of the number of the installed cylinderson the screen at the front of the QCCU.




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CONTROL & INDICATION - ALTITUDE PRESSURE SWITCH ... QCCU




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SERVICING

FILLINGRefilling of the cylinders is accomplished via the oxygen filling port.This port is installed on the oxygen fill panel and enables connectionof an external oxygen source for replenishing of the oxygen cylinders.The correct filling pressure depends on the outside and the cargocompartment temperatures, and can be determined by the use of theaircraft placards. To check the correct fill pressure, you have tocalculate the average pressure in the replenished oxygen cylinders.Make sure that the pressure on the fill panel pressure indicator is thesame as the calculated average pressure in the oxygen cylinders.During filling, an increase in temperature in each cylinder is limitedby a thermal compensator. The QCCU monitors the fill pressure inthe cylinders and the pressure indication is displayed on the POXIPand on the indicator fill panel.

TEST PORT USEThe three test ports enable the maintenance crew to increase anddecrease the pressure in the oxygen system during a functional checkof the system. The first test port, which is installed in the intermediateline before the oxygen regulators, is used for different tests and checksof the oxygen system. The second test port, which is installed in theoxygen distribution system downstream of the oxygen regulators, isused for different tests and checks of the oxygen distribution system.The third test port, which is installed in the oxygen distribution systemdownstream of the check valves, lets you decrease the pressure of thesupply lines downstream of the check valves. Before thedepressurization of the system, it is necessary to close the manualSOVs of the oxygen cylinders.

QCCU TESTThe QCCU test is done via the TEST P/B located on its front face.Before pushing this TEST P/B, turn the two switches on the QCCUuntil the correct number of oxygen cylinders installed in the aircraftcomes on, on the QCCU display. If there is no QCCU indication, theTEST P/B can be pushed:- the COMPUTER, TEMPERATURE and PRESSURE indicatorscome on,- the QCCU displays the "88" indication.After 3 seconds:- the COMPUTER, TEMPERATURE and PRESSURE indicators gooff,- the QCCU displays the number of selected oxygen cylinders.After 12 seconds, the number of selected oxygen cylinders on theQCCU display goes off.




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CREW PORTABLE OXYGEN SYSTEM D/O (3)

GENERAL

The portable breathing equipment (PBE) provides eyes protection andsupplies oxygen to the crew member in case of emergency: fire, or anemission of smoke or noxious gases. The PBE allows freedom ofmovement to extinguish a fire.

LOCATION

The PBE is vacuum-packed in a transport/storage container. A PBEcontainer is installed in the cockpit. PBEs for cabin crew are installed incabin.


CREW PORTABLE OXYGEN SYSTEM D/O (3) Sep 17, 2007Page 30


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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 PBE is stored under a vacuum in a specially designed bag. The bagis mounted inside a box in such a way that, after opening the box, thehood is removed and the vacuum protection is automatically opened witha 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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PORTABLE BREATHING EQUIPMENT

The Portable Breathing Equipment gives breathing means and eyesprotection for one user in case of: fire, or emission of smoke and/ornoxious gases. It lets the user move freely.The Portable BreathingEquipment container is installed with a good-condition indicator and atamper seal for the pre-flight inspection. The annular container in thehood, full of compressed oxygen, releases the amount of oxygen that theuser needs. The gas circulation is generated when the user breathes inand out. Cockpit Portable Breathing Equipment container can beoptionally installed in the cabin.




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PORTABLE BREATHING EQUIPMENT




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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.


CREW OXYGEN CYLINDER REMOVAL & INSTALLATION (3) Sep 17, 2007Page 42


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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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AIRBUS S.A.S.31707 BLAGNAC cedex, FRANCE

STMREFERENCE U5F07351

SEPTEMBER 2007PRINTED IN FRANCEAIRBUS S.A.S. 2007

ALL RIGHTS RESERVED

AN EADS JOINT COMPANYWITH BAE SYSTEMS

Documents

35 Oxygen