Atr 35 Ata [PDF]

Zitiervorschau

ATA 35 OXYGEN

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35.00 GENERAL

Presentation

ATR is a pressurized aircraft certified at Flight Level 250. According to European and American airworthiness regulation, it is equipped with oxygen supply in case of cabin pressure loss, noxious gas or smoke emission. The oxygen system of the ATR has been designed to supply cockpit crew members and observer, the cabin crew and 25 % of passengers during 30 min: - 4 minutes to descend from 25,000 ft to 13,000 ft, - Continuation of flight between 13,000 ft and 10,000 ft for 26 minutes. Note: The oxygen system for supplying 100% of passengers is optional.

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35.00 GENERAL

Presentation

Oxygen system is provided to crew members and passengers by means of several systems: - a fixed oxygen installation composed of: - Oxygen storage and supply system, located in the cockpit, - Crew oxygen distribution system, - Passengers oxygen distribution system. - portable systems which include: - Portable oxygen units for the cabin attendants, - Cabin attendants breathing equipments.

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35.00 GENERAL

Presentation

Cockpit crew oxygen equipments: 3 oxygen masks used in case of: - Pressure drop: oxygen is provided during 120 minutes, - Smoke or noxious gas emission: oxygen is provided during 15 minutes.

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35.00 GENERAL

Presentation

Smoke goggles are located on each side of the cockpit near oxygen crew masks for pilot and first officer. Observer O2 equipment is located on the upper part of the avionics racks. Passengers oxygen equipments: The main system provides passenger protection through a pax valve. It controls flow to pax oxygen boxes. One diluted oxygen mask is stored in each box. Portable oxygen bottles are stored under cabin attendant seats. They permit a continuous diluted flow to both cabin attendants at 13,000ft for duration of 30 minutes. Each of this bottles is equipped with a diluted oxygen mask. Protective breathing equipments are located in the luggage box of the cabin. It is used only in case of smoke or noxious gas emission.

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35.00 GENERAL

Presentation

Renewal of the oxygen source can be done in two ways: - by changing the oxygen bottle, - by using oxygen refilling port. Note: It is possible to fill the oxygen cylinder in workshop.

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35.00 GENERAL

Presentation

In case of overpressure, the oxygen is discharged outside the aircraft by a safety circuit equipped with an overboard discharge indicator.

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35.00 GENERAL

Cockpit Panels

EWD shows oxygen system failures with corresponding procedures to solve them. On the Cabin System Display (SD) page of the MFD, parameters of cabin air conditioning are displayed and status of bleed valves, pack valves, ventilation system, pressurization system, oxygen system and doors. Oxygen panel is located on the overhead panel (22VU). It controls crew and passengers oxygen distribution. Note: 3 oxygen 3rd masks occupant aremask located andinits the box, cockpit: with oxygen one on adapter each side extension of the cockpit are located for captain behind and captain first officer, seat, near an the LHother electronic for therack 3rd (80 occupant VU). observer. 3 smoke goggles are located in the cockpit: one on each side of the cockpit for captain and first officer, located below oxygen masks, and the other for the 3rd occupant observer, located next to his oxygen mask. One oxygen bottle is present in the cockpit. It is located behind the captain seat.

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35.00 GENERAL

Cockpit Panels

19 oxygen masks are available in the cabin. 3 smoke hoods are available in the cabin. 2 portable oxygen bottles are available in the cabin.

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35.00 GENERAL

Cockpit Displays

The Multi Function Displays (MFDs) show the System Display symbology on the upper left part of the SD Cabin page. State 1 is displayed when main supply is "OFF". State 2 is displayed when main supply is "ON", PAX supply is "OFF" and pressure is available. State 3 is displayed when main and PAX supplies are "ON" and when pressure is available. State 4 is displayed when main and PAX supplies are "ON" and low pressure (LO PR) is detected.

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35.00 GENERAL

Interfaces

Oxygen system is composed of a fixed installation, portable units and several types of breathing equipments. Electrical System provides power to all the oxygen system. Oxygen is provided to all the system by fixed and portable oxygen bottles, and oxygen refilling ground cart unit is also available. Oxygen system supplies passengers, cabin attendants, pilots and observer oxygen distribution systems. Electrical control signals ensure the system is operating.

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35.00 GENERAL

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Exercises

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35.00 GENERAL

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Exercises

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35.00 GENERAL

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Exercises

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35.00 GENERAL

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Exercises

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35.00 GENERAL

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Exercises

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35.00 GENERAL

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Exercises

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35.00 GENERAL

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Exercises

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35.10 CREW OXYGEN SYSTEM

System Description

The crew and passenger oxygen systems are composed of 3 subsystems: - the oxygen storage and supply, - the crew oxygen distribution (pilots and observer), - the passenger oxygen distribution. Oxygen panel is located on the overhead panel (22VU). It controls crew and passengers oxygen distribution. Oxygen supply is displayed on MFD.

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35.10 CREW OXYGEN SYSTEM

System Description

The oxygen system is used by the flight crew members and passengers to sustain a brutal loss of cabin pressure. Crew members can also use their oxygen masks in case of smoke.

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35.10 CREW OXYGEN SYSTEM

System Description

To re-examine the various pictures of the components, click on their representations.

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35.10 CREW OXYGEN SYSTEM

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Exercises

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35.11 OXYGEN STORAGE FIXED SUPPLY

System Description

The main component of the oxygen storage and supply is a high pressure gaseous oxygen cylindric bottle The oxygen cylinder is the common reservoir for: - crew oxygen distribution, - passenger oxygen distribution. Valves and switches are fitted on the oxygen storage / supply system to allow flow control and monitoring: - Pressure regulator and transmitter, - Crew feed stop valve, - Pax feed stop valve, - Manifold distributor, MW35.11_.01.S1L1

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35.11 OXYGEN STORAGE FIXED SUPPLY

System Description

A test port is fitted on the system. The system comprises also a high and low overpressure safety relief.

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35.11 OXYGEN STORAGE FIXED SUPPLY

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System Description

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35.11 OXYGEN STORAGE FIXED SUPPLY

System Operation

The A/C configuration is the following: - Aircraft is de-energized - All lights are extinguished - Oxygen bottle shut off valve is closed - No oxygen in the circuit Now, the aircraft must be energized and oxygen bottle main shut off valve open. Aircraft configuration is: - aircraft is energized, - oxygen bottle shut-off valve is open, MW35.11_.02.S2L2

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35.11 OXYGEN STORAGE FIXED SUPPLY

System Operation

- « OFF » white light on MAIN SUPPLY pushbutton is illuminated. - OXY supply information on SD CABIN page is updated. Pressure gauge on oxygen panel indicates oxygen pressure by means of pressure regulator/transmitter and the pressure is regulated at 78PSI Now, MAIN SUPPLY pushbutton must be pressed in. The A/C configuration is now: - aircraft is energized, - Oxygen bottle shut off valve is open, - OFF white light on MAIN SUPPLY pushbutton extinguishes - The OXY supply information on SD CABIN page is updated Crew feed stop valve opens and supplies oxygen to distributor manifold. Now, PAX SUPPLY pushbutton must be set to ON. The A/C configuration is now: - aircraft is energized, - Oxygen bottle shut off valve is open, - ON blue light on PAX SUPPLY pushbutton illuminates - The OXY supply information on SD CABIN page is updated Pax feed stop valve opens and passenger distribution oxygen system is supplied. When oxygen over pressure occurs in the bottle or regulator, the over pressure safety relief allows oxygen flow to be ejected overboard. A green disk is fitted on aircraft external skin. It blows out when pressure is > 20 PSI. Then a yellow colour appears. This system indicates oxygen Overpressure to the crew during walk around.

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35.11 OXYGEN STORAGE FIXED SUPPLY

System Operation

If oxygen pressure drops below 50 PSI in the LP circuit, the LP pressure switch fitted on the distributor manifold detect the loss of oxygen pressure. - LO PR amber light on MAIN SUPPLY pushbutton illuminates, - OXY supply information on SD CABIN page is updated (in amber) - EWD displays the « OXY » warning with the associated procedure - Master caution light and single chime is activated.

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35.11 OXYGEN STORAGE FIXED SUPPLY

System Operation

When connected to a nitrogen source (aircraft de-energized and oxygen bottle shut off valve closed), Test port allows: - leak test of Oxygen systems, - cleaning - functional test of oxygen systems and equipment.

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35.11 OXYGEN STORAGE FIXED SUPPLY

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Exercises

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35.11 OXYGEN STORAGE FIXED SUPPLY

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Exercises Level 2

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35.11 OXYGEN STORAGE FIXED SUPPLY

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Exercises Level 2

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35.11 OXYGEN STORAGE FIXED SUPPLY

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Exercises Level 2

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35.11 OXYGEN STORAGE FIXED SUPPLY

Oxygen Cylinder

Location: The high pressure oxygen cylinder is located vertically, inside the flight compartment in front of the left electronic rack (80VU).

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35.11 OXYGEN STORAGE FIXED SUPPLY

Oxygen Cylinder

Description: The main characteristics of the cylinder, which supplies oxygen to the crew and passenger distribution system are: - Capacity: 2182 liters (77ft3) in standard conditions (normal temperature= 21°C and pressure 1013 mbar). - Nominal charge: Nominal charge pressure of 1850 PSI is reduced to 78PSI in the oxygen distribution system.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Main Shut off Valve

Location: The Main Shut off valve is located on the top of the oxygen bottle.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Main Shut off Valve

Description: The slow-opening manual shut off valve is designed with metal/metal type seats, to avoid ignitions (explosions).

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35.11 OXYGEN STORAGE FIXED SUPPLY

Pressure Gauge

Location: The direct pressure gauge is fitted on the outlet of the oxygen bottle.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Pressure Gauge

Description: The gauge indicates cylinder pressure with main shut off valve open, or closed.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Pressure Regulator

Location: The pressure regulator/transmitter is located on the top of the oxygen bottle.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Pressure Regulator

Description: The HP regulator/transmitter is composed of two stages: - A high pressure stage including a high pressure transducer sending an electrical signal to a remote indicator located on the cockpit oxygen panel - A low pressure stage including a downstream pressure regulation at a nominal value of 78+/- PSI (5.38+/-0.55bars) for a flow of 200 l/mn (normal temperature=21°C and pressure 1013 mb). A port with an integrated pressure relief valve limits the pressure as follows: - opening: 120+/-4 PSI (8+/-0.25 bars). - overpressure limited at 160PSI (11.65 bars). MW35.11_.08.C1L3

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35.11 OXYGEN STORAGE FIXED SUPPLY

Pressure Regulator

Operation: When the cylinder manual shut off valve is open, the pressure indicator shows: - Red range: 0 -> 5.86 bar (0->86PSI) - Green range: 5.86 -> 140 bar (85->2025PSI)

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35.11 OXYGEN STORAGE FIXED SUPPLY

Hight and Low Overpressure Safety Relief and Device

The high and low pressure safety relief and device is fitted on the oxygen bottle and goes out on the fuselage (by means of the Overboard Discharge Indicator).

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35.11 OXYGEN STORAGE FIXED SUPPLY

Hight and Low Overpressure Safety Relief and Device

In case of a rise in ambient temperature, the oxygen increases and causes the expansion of the cylinder pressure, the oxygen is discharged by: - The cylinder safety valve (HP overpressure), - The low pressure stage overpressure safety port of the HP regulator/transmitter. The oxygen is discharged overboard by a safety circuit equipped with an overboard discharge indicator. The discharge indicator is composed of a green plastic blow-out disc, visible from oustide the aircraft. This disc is ejected from it housing when subjected to any pressure exceeding 20 PSI (1.38bar), releasing the yellow color inside the indicator body.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Renewal of Oxygen Source

Location: The renewal of the oxygen source is done by means of a filling system located on electronic rack 80VU (cargo compt side).

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35.11 OXYGEN STORAGE FIXED SUPPLY

Renewal of Oxygen Source

Description: The renewal of the oxygen source can be done in two ways: - by changing the oxygen cylinder (Note: it is possible to fill the oxygen cylinder in the workshop) - on the aircraft, by means of a filling system connected to the HP regulator/transmitter.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Renewal of Oxygen Source

The system consits of: - a pipe connected to the HP regulator transmitter (routed through the electronic rack 80VU and connected to a filling port) - a ventilation duct in which the oxygen duct is routed, through the rack 80VU - a filling port fitted with a check valve, protected by a door behind the electronic rack 80 VU. The oxygen flow is maximum for an inlet pressure of 100 PSI (7 bars), (normal temperature = 21°C and pressure 1013 mbar).

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35.11 OXYGEN STORAGE FIXED SUPPLY

Crew Feed Stop Valve

The Crew Feed Stop Valve is located on the Oxygen cylinder housing.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Crew Feed Stop Valve

Description: The crew feed stop valve is operated by the Main Supply push button, located on the overhead panel. The crew feed stop valve solenoid controls opening and closing of the oxygen flow. The control unit is fitted close to the oxygen cylinder.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Crew Feed Stop Valve

Operation: The valve's internal logic enables the solenoid electrical supply to be maintain for a fraction of a second, corresponding to the opening and closing time of valve.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Manifold Distributor

The Manifold distributor is located near the oxygen cylinder.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Manifold Distributor

Connected to the supply manifold: - 2 supply pipes for the crew (captain, F/O and observer), - 1 supply pipe for passengers, - 1 pipe for test port assembly, - 1 LP pressure switch.

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35.11 OXYGEN STORAGE FIXED SUPPLY

LP Pressure Switch

The LP Pressure Switch is installed on the supply Manifold.

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35.11 OXYGEN STORAGE FIXED SUPPLY

LP Pressure Switch

The LP Pressure Switch provides an electrical signal LO PR light of the MAIN SUPPLY push button on the cockpit overhead panel when a pressure falls to 50 +/- 5 PSI (3.45 +/- 0.35 bars). It also displays an « OXY » caution message with the associated procedure on the EWD. The oxygen system status is displayed in amber with amber LO PR legend on the MFD Cabin System page.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Pax Feed Stop Valve

Location: The Pax feed stop valve is located on the Oxygen cylinder housing.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Pax Feed Stop Valve

Description: The Pax feed stop valve solenoid controls the opening and closing of the oxygen flow. The control unit is fitted on the pax feed stop valve. When the Pax supply pushbutton is selected ON, the « ON » blue legend is illuminated and the oxygen is distributed to the passengers.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Test Port

Description: Test Port is installed on the oxygen bottle housing.

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35.11 OXYGEN STORAGE FIXED SUPPLY

Test Port

Description: The Test Port is equipped with a bayonet connection with an integrated check valve. An airtight cap covers the test port. It designed to be fitted with a PURITAN 110 11 test connector. Max pressure to be applied is: 94 PSI (6.5 bars). This test enables a leakage test after any component replacement, functional test if the oxygen cylinder is not installed and cleaning pipes operations.

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35.13 OXYGEN DISTRIBUTION (CREW)

System Description

A rigid duct connects the supply maniflod to the masks assy via flexible hoses. They are fitted with self sealing coupling for easy disconnect. The crew oxygen mask consists of: - an inflatable harness, - a regulator knob, - a microphone, - an airtight facepiece equipped with: a manual valve which supplies oxygen through a flexible hose and permits demisting of the anti smoke goggles.

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35.13 OXYGEN DISTRIBUTION (CREW)

System Operation

The regulation diaphragm, held by a spring, closes the control circuit of the main valve. The main valve, submitted to control pressure on its entire surface, closes the user circuit.

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35.13 OXYGEN DISTRIBUTION (CREW)

System Operation

Harness inflating: By pressing on the right clip, the pressure oxygen is sent to the harness. When the clip is released, the oxygen is discharged out.

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35.13 OXYGEN DISTRIBUTION (CREW)

System Operation

Normal supply inhalation: Inhalation: The regulation diaphragm, subjected at a negative pressure, opens the main valve control. The main valve, under the effect of the control pressure variation, opens the circuit. The user breathes a mix of O² / air. The air quantity is regulated by the aneroid capsule.

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35.13 OXYGEN DISTRIBUTION (CREW)

System Operation

Normal supply exhalation: Exhalation: Under the effect of the pressure, the regulation diaphragm closes the main valve control. It also lifts from its seat to allow the exhaled mixture out. The main valve closes the user circuit. The overpressure valve evacuates the O² accumulated in the regulation diaphragm.

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35.13 OXYGEN DISTRIBUTION (CREW)

System Operation

Pure O² supply: When the normal / 100% selector is in 100% position, the ambient air inlet is closed. The user breathes pure 0².

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35.13 OXYGEN DISTRIBUTION (CREW)

System Operation

Constant positive pressure supply: Operation of the regulator, under a constant positive pressure, is enabled through the emergency rotation knob. The normal / 100% selector is in the normal / 100% position to supply pure oxygen. When emergency rotation knob is selected, permanent pressurization of the regulation diaphragm prevents closure of the main valve's control circuit. This operation can be temporary by pushing on the continuous button and turning the knob in the clockwise direction (locking). The pressure of oxygen depends on the valve regulation, which prevents excessive pressure in the chamber.

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35.13 OXYGEN DISTRIBUTION (CREW)

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Exercises

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35.13 OXYGEN DISTRIBUTION (CREW)

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Exercises Level 2

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35.13 OXYGEN DISTRIBUTION (CREW)

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Exercises Level 2

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35.13 OXYGEN DISTRIBUTION (CREW)

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Exercises Level 2

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35.13 OXYGEN DISTRIBUTION (CREW)

Crew Oxygen Masks

Three crew oxygen maks are located in the cockpit; two for the pilots and one for the observer. The mask assembly consists of a mask stowed in a box.

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35.13 OXYGEN DISTRIBUTION (CREW)

Crew Oxygen Masks

This box is fitted with two door flaps, maintaining the mask in its housing. The LH flap is equipped with a TEST/RESET slider and a blinker indicator.

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35.13 OXYGEN DISTRIBUTION (CREW)

Crew Oxygen Masks

To operate the crew oxygen mask: - take the mask by squeezing the red clips, - remove the mask, the harness inflates, - donning of the mask (harness inflated), - release the red clips: harness deflates and maintains the mask, - breath normally.

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35.13 OXYGEN DISTRIBUTION (CREW)

Smoke Goggles

Smoke goggles are located near oxygen mask stowage boxes.

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35.13 OXYGEN DISTRIBUTION (CREW)

Smoke Goggles

When worn, they can be automatically demisted by oxygen supplied from oxygen mask.

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35.13 OXYGEN DISTRIBUTION (CREW)

Third Occupant Mask With Oxygen Adapter

The 3rd occupant's oxygen mask is fitted with an oxygen adapter extension box, which can be used as far away as the forward cargo compartment.

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35.20 PASSENGER OXYGEN

System Description

The passenger fixed oxygen system ensures that the passengers are supplied with oxygen in the event of a loss of "cabin pressurization". The fixed oxygen system supplying the passengers is connected to the supply manifold of the flight crew supply system. The pax feed stop valve enables passenger oxygen supply by direct action of the crew on the flight compartment control and monitoring panel. Number of supplied passengers = 25% simultaneously The system comprises a fixed installation supplying pax masks uniformly distributed in the passengers compartment.

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35.20 PASSENGER OXYGEN

System Description

To re-examine the various pictures of the components, click on their representation.

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35.20 PASSENGER OXYGEN

System Operation

During inhalation, the inhalation and diluter valves open, allowing an air/oxygen mixture into the mask. During exhalation, the exhalation valve closes and the exhaled air is evacuated out of the mask. During exhalation, the reservoir bag receives the oxygen from the distribution system, avoiding any loss of oxygen between the inhalation and exhalation cycles, thus limiting oxygen consumption to the user's requirements. The flow indicator, installed on the flexible supply line, serves to check oxygen supply to the user.

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35.20 PASSENGER OXYGEN

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Exercises

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35.20 PASSENGER OXYGEN

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Exercises

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35.20 PASSENGER OXYGEN

MW35.20_.04.E1L2

Exercises Level 2

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Page 81

35.20 PASSENGER OXYGEN

Altitude Compensating Regulator

The altitude compensating regulator feeds oxygen boxes in case of rapid depressurization of the passengers compartment. The oxygen compensator regulates the pressure in the distribution pipes such that the required oxygen flow depending of the cabin altitude is correctly assumed by each masks. It operates between 25000ft and 10000ft cabin altitude. Note: Because of the cabin altitude compensating regulators, passengers oxygen supply is not available on ground (oxygen regulators closed < 10000ft).

MW35.20_.05.C1L3

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Page 82

35.20 PASSENGER OXYGEN

Altitude Compensating Regulator

The oxygen flow is controlled through the pressure regulator. The oxygen flow supplies each oxygen mask. With an input pressure of 70 PSI (4,8 bar, in normal temperature = 21 °C and pressure = 1013 mbar), the oxygen flow is: - 0,7 l/mn at 10000 ft, - 1,7 l/mn at 25000 ft.

MW35.20_.05.C1L3

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Page 83

35.20 PASSENGER OXYGEN

Passenger Masks

Passengers oxygen masks are enclosed to a module located above passengers between Passenger Service Units.

MW35.20_.06.C1L3

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Page 84

35.20 PASSENGER OXYGEN

Passenger Masks

The oxygen mask supply line is a PVC type, 2,5m long (8,2 ft). It is comprised of a flow indicator and linked to the passenger fixed distribution.

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Page 85

35.20 PASSENGER OXYGEN

Passenger Masks

The oxygen module door is opened by introducing a manual release tool into the small hole of the door and pushing it. The manual release tool is located in the flight attendant's seat storage compartment.

MW35.20_.06.C1L3

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Page 86

35.30 PORTABLE OXYGEN

System Description

The cabin attendant portable oxygen system comprises the following equipments: - oxygen cylinder, capacity 120 liters with nominal charge 1800 PSI (124 bars), - sustaining oxygen mask, - smoke hood.

MW35.30_.01.S1L1

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Page 87

35.30 PORTABLE OXYGEN

System Description

To re-examine the various pictures of the components, click on their representations.

MW35.30_.01.S1L1

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Page 88

35.30 PORTABLE OXYGEN

MW35.30_.02.E1L1

Exercises

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Page 89

35.30 PORTABLE OXYGEN

Protective Breathing Equipment

Three Protective Breathing Equipments (PBE) are located in the ATR72 cabin, and an optional one in the cockpit. Note: In the ATR42, two PBEs are fitted in the cabin and one in option in the cockpit. The PBE protects the eyes, nose and mouth and provides a breathing chemical gas for a minimum of 15 minutes in case of fire, smoke or noxious gases.

MW35.30_.04.C1L3

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Page 90

35.30 PORTABLE OXYGEN

Protective Breathing Equipment

The smoke hood (PBE: Protective Breathing Equipment) is a closed circuit breathing apparatus used to protect the user's eyes and respiratory system in an unbreathable atmosphere. The PBE comes in the form of a hood completely covering the head and made airtight at the neck by a thin elastic membrane. The reaction of water vapour (contained in the expired air) with the potasium superoxyde (KO2) produces oxygen which is freed in the hood. A starter candle produces the necessary heat to start the sodium chlorate chemical reaction, releasing 8 liters of oxygen to inflate the hood and obtain the initial breathable air.

MW35.30_.04.C1L3

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Page 91

35.30 PORTABLE OXYGEN

Protective Breathing Equipment

To operate the PBE: - grasp red access handle and pull forcibly to disengage the cover. Locate red I.D. tag and pull sharply to tear open vacuum sealed bag, - pull PBE out of vacuum sealed bag and shake hood to open. - place both hands into the neckseal opening with palms facing each other and PBE visor facing downward with the KO2 container resting top of hands. - with the head bent forward, guide the PBE neckseal over the top of the head and down over the face using the hands to shield the face and glasses from oronasal mask cone. - with both hands, grasp the adjustment straps at the lower corner of the visor and pull outward sharply to actuate the starter candle. - with the straps still in hand and head bent forward, pull backward to secure the oronasal mask cone high on the nose for a tight seal. MW35.30_.04.C1L3

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Page 92

35.30 PORTABLE OXYGEN

Protective Breathing Equipment

- if wearing glasses, you may adjust the position of the lenses to rest on top of the oronasal mask cone by moving the side of the frame through the hood fabric. Do not attempt to adjust through the neckseal as this will result infiltration of the surrounding atmosphere into the interior of the hood. - when the neckseal is positionned at the neck and the KO2 cannister is resting on the nape of the heck, remove the hands, checking to see that clothing is not trapped in the seal and hair does not protrude between the seal and the neck. Pull the protective neck shield down to cover the collar and upper shoulder area.

MW35.30_.04.C1L3

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Page 93

35.CI CONTROLS AND INDICATORS

Oxygen Panel

The Oxygen Panel (22VU), located on the overhead panel, and the MFD allow to control and verify oxygen system functioning. HP INDICATOR indicates oxygen bottle pressure. It is displayed in PSI x 1000. The scale is marked by 2 color arcs: - RED ARC: from 0 to 85 PSI, - GREEN ARC: from 85 to 2025 PSI. If preflight pressure is < 1400 PSI, quantity must be checked to be adequate for intended flight.

MW35.CI_.01.I1L2

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Page 94

35.CI CONTROLS AND INDICATORS

Oxygen Panel

The MAIN SUPPLY push button controls the crew feed stop valve. When the push button is switched OFF, the valve is closed and OFF illuminates white. When the push button is switched on, the valve is open and oxygen pressure supplies the cockpit crew oxygen masks. LO PR illuminates in amber and the CCAS is activated when a low pressure (< 50 PSI) is detected in the low pressure distribution circuit.

MW35.CI_.01.I1L2

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Page 95

35.CI CONTROLS AND INDICATORS

Oxygen Panel

PAX SUPPLY push button allows to control passenger oxygen distribution. If push button is released, the passengers supply valve is closed. If PAX SUPPLY push button is activated, ON illuminates blue and passengers supply valve is opened.

MW35.CI_.01.I1L2

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Page 96

35.REV SYSTEM REVISIONS

Normal Operation

A/C configuration: - aircraft is de-energized (BAT: OFF position), - oxygen main shut-off valve is closed, - all lights are extinguished, - no oxygen in the circuit. Now, please energize the aircraft by selecting BAT switch to ON position. A/C configuration: - aircraft is energized (BAT: ON position), - oxygen main shut-off valve is still closed, MW35.REV.01.V1L2

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Page 97

35.REV SYSTEM REVISIONS

Normal Operation

- main supply white OFF light illuminates, - HP indicator on oxygen panel indicates 0PSI. Please, select the oxygen bottle to open the oxygen main shut off valve. A/C configuration: - aircraft is energized (BAT: ON position), - oxygen main shut-off valve is opened, - HP indicator on oxygen panel indicates 1850 PSI. The oxygen flows in the circuit. The pressure is transmitted in the gauge indicator and is regulated for the low pressure circuit but the crew feed stop valve closes the distribution. Please, select Main supply push button. A/C configuration: - aircraft is energized (BAT: ON position), - oxygen main shut-off valve is opened, - HP indicator on oxygen panel indicates 1850 PSI, - main supply white OFF light extinguishes. Oxygen flows in the supply circuit. Crew feed stop valve is opened and feeds crew oxygen masks. Pax feed stop valve is still closed. A/C configuration: - aircraft is energized (BAT: ON position), - oxygen main shut-off valve is opened, - HP indicator on oxygen panel indicates 1850 PSI, - main supply white OFF light is extinguished, - pax supply blue ON light illuminates. Oxygen flows in the supply circuit. Crew feed stop valve and Pax feed stop valve are opened. Crew and passenger distribution systems are now supplied. If necessary, passenger oxygen masks are available in the oxygen boxes. END OF PROCEDURE.

MW35.REV.01.V1L2

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Page 98

35.REV SYSTEM REVISIONS

Abnormal Operation

A/C configuration: - aircraft is energized (BAT: ON position), - oxygen main shut-off valve is opened, - HP indicator on oxygen panel indicates 1850 PSI, - main supply white OFF light is extinguished, - pax supply blue ON light illuminates. Main supply amber LO PR light illuminates when oxygen pressure