atr air systems

8/8/2019 ATR Air Systems

1/59


2/59


3/59


4/59


5/59

PNEUMATIC SYSTEM

AIR

P 1

MAY 98

001

1.03.20

20.1 DESCRIPTION (See schematic p 7/8)

Compressed air is bled from the engine compressors at the LP or HP stages.The pneumatic system consists of all the systems designed to supply air to thevarious aircraft systems, zones or engines, with associated control, monitoring andindicating components. It supplies under pressure air for air conditioning,pressurization and ice protection system. A protection against overheat due to possible leakage around the hot air ducts isprovided.

AIR BLEED- Air conditioning and pressurizationThe system is designed to :S select the compressor stage from which air is bled, depending on the pressure

and/or temperature existing at these stages.S regulate air pressure in order to avoid excessive pressuresAir is generally bled from the low compressor stage (LP). At low engine speed whenpressure from LP stage is insufficient, air source is automatically switched to thehigh compressor stage HP. (This may occur on ground and during descent at F.I.).Transfer of air is achieved by means of a pneumatically operated and electrically

controlled b tterfl al e (HP al e) hich remains closed in absence of electrical

AA


6/59


7/59


8/59

PNEUMATIC SYSTEM

AIR

P 2

NOV 99

100

1.03.20

CROSSFEED

The crossfeed valve installed on the crossfeed duct is designed to connect LH and RHair lbeed systems.- On the ground, it is always open except when both engines are running and

propeller brake is disengaged.- In flight, the crossfeed valve is normally closed. This is a spring loaded closed,

solenoid controlled, pneumatic shut off valve. The valve is closed with solenoiddeenergized.

LEAK DETECTION SYSTEM

A continuous monitoring system is installed in order to detect overheat due to ductleakage and to protect the structure and components in the vicinity of hot air ducts :- Wing leading edge and wing to fuselage fairing,- Upper and lower fuselage floor,- Air conditioning pack area.

In order to ensure rapid leak sensing, a Kevlar envelope is installed around the majorpart of the high temperature ducts to collect and direct leaking air to the sensingelements.The sensing system includes two single loop detection assemblies, one for the RH

d f th LH i d t t

AA


9/59


10/59


11/59

PNEUMATIC SYSTEM

AIR

P 3

NOV 99

100

1.03.20

20.2 CONTROLS

AIR BLEED PANEL

TOFA010320003100AA

AA


12/59


13/59


14/59


15/59

PNEUMATIC SYSTEM

AIR

P 5

NOV 99

100

1.03.20

MFC LOGIC

See chapter 1.01

SYSTEM MONITORING

The following conditions are monitored by visual and aural alerts :

- Bleed valve position in disagree with command.D See BLEED VALVE FAULT procedure in chapter 2.05.08

- Overheat in bleed duct (T ductu 274C/525F).D See BLEED OVHT procedure in chapter 2.05.08

- Bleed air leak (Loopu 153C/307F).D See BLEED LEAK procedure in chapter 2.05.08

AA


16/59


17/59

ATR 42 Model : 500

PNEUMATIC SYSTEM

AIR

P 7/8

NOV 99

001

1.03.20

20.5 SCHEMATIC

AA


18/59

ATR 42 Model : 500

PNEUMATIC SYSTEM

AIR

P 7/8

NOV 99

400

1.03.20

20.5 SCHEMATIC

AA


19/59


20/59


21/59


22/59

AIR CONDITIONING

AIR

P 2

NOV 99

090

1.03.30

AIR VENTILATION

Conditioned air is blown into the cabin by outlet ramps located under the hot racksthrough two electrical isolating valves (CAB VENT).

It is then evacuated through guides along the cabin side walls at floor level. A part ofit is recirculated by the fans, the other part being evacuated overboard through theoutflow valves installed in the rear under floor.

The toilet is ventilated by differential pressure through a vent line.

AA


23/59


24/59


25/59


26/59

AIR CONDITIONING

AIR

P 2

NOV 99

090

1.03.30

AIR VENTILATION

Conditioned air is blown into the cabin by outlet ramps located under the hot racksthrough two electrical isolating valves (CAB VENT).

It is then evacuated through guides along the cabin side walls at floor level. A part ofit is recirculated by the fans, the other part being evacuated overboard through theoutflow valves installed in the rear under floor.

The toilet is ventilated by differential pressure through a vent line.

AA


27/59


28/59


29/59


30/59


31/59


32/59


33/59


34/59


35/59


36/59


37/59


38/59

AIR CONDITIONING

AIR

P 10

NOV 99

090

1.03.30

30.3 ELECTRICAL SUPPLY/MFC LOGIC/SYSTEM MONITORING

ELECTRICAL SUPPLY

EQUIPMENTDC BUS SUPPLY

(C/B)

LH SIDEPack valve DC ESS BUS

(on lateral panel PACK VALVE)

Recirculation fan DC UTIL BUS 1

(on lateral panel PWR SUPPLY CTL)Pack and recirculation fan alert DC ESS BUS

(on lateral panel PACK and RECIRC FANCAUTION)

FLT COMPTautomatic temperature control

DC ESS BUS(on lateral panel AUTO)

FLT COMPT Manualtemperature control

DC ESS BUS(on lateral panel MAN)

RH SIDE

AA


39/59


40/59


41/59


42/59

AIR CONDITIONING

AIR

P 10

NOV 99

410

1.03.30

30.3 ELECTRICAL SUPPLY/MFC LOGIC/SYSTEM MONITORING

ELECTRICAL SUPPLY

EQUIPMENTDC BUS SUPPLY

(C/B)

LH SIDEGround cooling fan DC BUS 1

(on lateral panel GND COOLING FAN CTL)

Pack valve DC ESS BUS

(on lateral panel PACK VALVE)Recirculation fan DC UTIL BUS 1

(on lateral panel PWR SUPPLY CTL)

Pack and recirculationfan alert

DC ESS BUS(on lateral panel PACK and RECIRC FAN

CAUTION)

FLT COMPTautomatic temperaturecontrol

DC ESS BUS(on lateral panel AUTO)

AA


43/59


44/59


45/59


46/59


47/59

R Mod : 4273 ATR 42 Model : 500

AIR CONDITIONING

AIR

P 15/16

NOV 99

090

1.03.30

AA


48/59


49/59

Mod : 4273 ATR 42 Model : 400

AIR CONDITIONING

AIR

P 15/16

NOV 99

410

1.03.30

AA


50/59


51/59


52/59


53/59


54/59


55/59


56/59


57/59


58/59


59/59

atr air systems

Documents