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ATA 36 PNEUMATIC

Air sources

On Ground: APU has a priority, HP

Ground connection, Engines

On Air: Engines, APU

Engine Bleed arranged in order

1. IP: 2Check valve Pneumatically

Operated and Controlled from

8thstage at Highpower setting.

2. Anti-Ice valve3. HP: Pneumatically Valve

Operated, Electrically

Controlled, and spring-loaded closed in the absence of upstream pressure or

electrical power supply from15thstage at idlepower setting.

a. Two solenoids, A and Bb. Close limit switchc. Petapping

4. Bleed Valve: Regulate pressure to 45 psi Open at a Minimum Pressure 12 psi,

AUTO Mode:De-energized open

5. Starter Valve

6. Over Pressure valve:protect the

system if HPfail

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7. APU: Shutoff Valve

electrically controlled

and pneumatically

operated, spring loaded

close.

The APU BLEED VALVE Includes a VISUAL POSITION INDICATOR and a MANUAL

OVERRIDE which serves to actuate the VALVE BUTIERFLY on the ground.

APU SOV

- The APU Itself regulates its air pressure.- Open when solenoid is energized.- Closed when solenoid is de-energized and Leak detection

8. X FEED Valve2 Motors

a. AUTO mode and MANUALmode

b. The APU BLEED and X FEED valves will automatically close If :

i. APU rpm < 95 %.

ii. Reverse airflow in APU air bleed ducting.

iii. Leak detection

Closed:When air is normally bled from engines, when ENG FIRE handle Is

actuated, when ambient overheat Is detected (LEAK warning).

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9. Fan Air valve: Pneumatically operated Electrically Controlled, Engine air bleed

temperature regulation and limitation are achieved by an air-to-air PRECOOLER

and the FAN AIR VALVE system. need a minimum air muscle pressure of 20 psi.

- With the wing anti-Ice protection "OFF", the regulated T=177oC,

- With the anti-Ice protection "ON", the

regulated T=227oC.

Note:On single engine bleed air supply

the normal regulated temperature is also

227oC.

Warnings and Test

ATA 21AIR CONDITIONPack Flow Control Valve

Electricallycontrolled by 2 solenoids

one for closureand other for

Economic flow, pneumatically

actuated, normally closed butterfly

flow control and shut-off valve.

It controls the airflow with two flow

schedules:NORMALOR ECONOMIC.

Its Manual override and Visual position indicator

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NORMAL FLOW VALVE OPENING CONDITIONS

1. Corresponding fire handle guarded

2. No ditching configuration

3. No engine starting (see note)

4.

No pack overheats. (pneumatic condition)5. Pack valve p/b pressed in

Notes:

ENGINE STARTING closure signal is given by ENGINE START rotary selector and/or by

START pushbutton and this signal is Inhibited In flight.

Economy Flow inhabited if only one back is operated

A FAULTlight comes on amberwhen the valve position is in disagreement.

PACK OVERHEAT

There is a fuseand a thermostatat the compressor outlet and at the turbine Inlet.

Pack flow control valve closes In the event of pack overheat.

Notes:

If fuse has melted, the flow control valve remains closed.

If thermostat, the valve regulates again when the overheat condition disappears.

Compressor Outlet Turbine Inlet

Thermostat thresholds 282 to299 C 121 C

Fusible plugs thresholds 304 C 135 C

ANTI-ICE

Pneumaticallycontrolled by Psensor betweenTurbine exit and Water-separatorexit

AIR INLET FLAP

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RAM Air Door

When RAM AIRpushbutton is switched ONit Illuminates .WHITEand there is no

Ditching, a full open signal is sent to the Emergency Ram Airactuator and to the

Outflowvalves.

The OPENgreen light Illuminates when the flap is fully opened.

Note: The emergency ram air will close also In case of ditching

Note: The A/C cannot be dispatched with the emergency ram air Inlet Inoperative.

Temperature Control

When the temperature reaches 88oCIn one of the cabin or cargo ducts:

1. The OVHTlight illuminates

2. The ECAM activation.

3. The hot air supply valve closes.

HI PRESS

A hot air pressure switch, is located downstream of the hot air supply valve.

When pressure is higher than 12.5 psi above cabin pressure, the hot airsupply stores Fault after a delay of 3seconds.

The panel is located on the rear panel. The light will illuminate when called on ground.

Temperature Control

and are controlled by the coldesttemperature demand.

There are 4zones (Flight deck, FWDcabin, MIDcabin, AFTcabin) which can be

controlled independently, from the COMPARTMENT TEMPERATURE panel,

automatically or manually.

The pack outlet temperature can range from -7oCto +63oC,MAXcool selected The pack outlet temperature can range from +4oCto +63oC, MAXcool OFFIn the event of smoke detection:

1. The appropriate Indicator on the "CARGO COMPARTMENT SMOKEDETECTION" panel illuminates and in addition.

2. A closure signal is sent to:a. The trim air valveb. The fanc. The isolation valve.

Note: The ISOLATION VALVE pushbutton has to be reset to restore the system

normal operation after smoke cancellation.

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Controllers

There are 4zone controllers, 2 pack temperature controllers and 1APU and PACKDEMAND controller located on the 90VU.

The APUand PACK DEMAND CONTROLLERhave a BITE TEST which allows checking

the controllers Involved In the temperature regulation as well as the sensors.

Sensors Involved In the temperature cabin regulation. (2Zones + 3Ducts)

1. Zone controllers:

a. Zonetemperature sensorsb. Ducttemperature sensors

2. Indicator and the ECAM:

a. Zonetemperature sensors.b. Ducttemperature sensors.

3. Overheat protection:

a. Ducttemperature sensors.Note: When the rotary selector is not In CRT position, on the ECAM the Indications

are replaced byXX.

In order to avoid poss ible pack overheat at the beginning of pack temperature

regulation, the temperature demand signal between APUand PACK DEMAND

"CONTROLLER" and PACK"CONTROLLER" Is cut off for 3 minutesafter packvalve

has started to Open.

CARGO COMPARTMENTS

The system Includes:

1. A trim air valve.

2. A zone temperature sensor.

3. A duct temperature sensor.

4. A bulk cargo temperature controller.

Note: Cargo temperature regulation system is not connected to pack temperature

regulation system.

With the MANUALmode selector at MAN and hold at HOT, the controller actionis by-passed. The selector acts directly on the trim air valve (here as HOT has

been selected, the trim air valve opens).

The air is extracted by an electric fan then after passing through an Isolationvalve; the air is exhausted under the compartment itself, and heats the

compartment floor.

The fan and the Isolation valve are controlled by a pushbutton located on theCOMPARTMENT TIMPERATURE panel.

Note: the fan only operates if the isolation valve is fully open.

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There are four kinds of warning:

Warnings due to an Isolation valve disagreement. Warnings due to the fan failure. Warnings due to a duct over-temperature 90OC.

Warnings due to a cargo smoke detection.

Sensors Involved In the cargo temperature regulation:

1.

ECAM display and panel Indicatinga. Zone sensor.b. Duct over-temperature switchc. Duct sensor

2. Controller signal

a. Zone sensor.b. Duct sensor.

ECAM DISPLAY

1. Trim air valve position.

3.

Isolation valve position.

COMPARTMENT TEMPERATURE PANEL

INDICATING

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VENTILATION

3 cabin fans controlled from the overhead panel are installed to recirculate air when

required + double stage filters.

When the CABIN FANS pushbutton is pressed in and with the packs in the normal

mode, approximately 40 % of the air existing in the outlets is recalculated by electric

fans.

WARNINGS

A fan overheats of 90oCcauses the cut-off of the corresponding fan power supply,

and the white Illuminationof the corresponding MFA on the lateral panel.

LAVATORIES & GALLEYS

Are equipped with automatic ventilation system air is tapped from the cabin

distribution duct then it is extracted either by:

1. A fan operation (P < 1psi)

2. Peffect (Flight and P > 1 psi).

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30 Heating SystemWind shield heating: Prevent Ice, Prevent Fog formation

3 windows: Side Fixed, sliding + Front Window

We have 2modes of heating Lowin ground, Highin Air in the Frontal Windshield

only, the side has only one mode.

Test in HIand Test in LO

Short-circuit reads at -60oC simulation LO test.

35 Oxygen4Cylinders + 1Regulator for each for Cockpit + Courier With 5 Oxygen Masks

Located in E&E compartment.