AIR

Question 1

AIR SCHEMATIC

Answer 1

Question 2

Answer 2

Question 3

AIR CONDITIONING IN HOTEL MODE

Answer 3

On ground, when engine 2 is started in hotel mode:
– The right HP bleed valve is opened (air supplied by HP
compressor at low engine power)
– The right Eng bleed valve opened (at NH 45% + 30s)
– The cross feed valve is opened
– Both packs are supplied with air at 38 psi

Question 4

AIR CONDITIONING IN NORMAL FLIGHT

Answer 4

– Both HP bleed valves are closed (air supplied by LP compressor at high engine power)
– The cross feed valve is closed
– Each pack is supplied by its dedicated engine with air at
25 psi

Question 5

AIR CONDITIONING IN FLIGHT WITH A BLEED FAULT

Answer 5

In case of:
• Overtemperature (T>274°C)
• Leak (T>153°C outside the duct)
• Overpressure (P>80 psi)
The eng bleed valve is closed and the FAULT is triggered on the bleed P/B and on the pack P/B.

The other engine supplies the cockpit and cabin ducts throught the mixing chamber – HP bleed valves is closed (air supplied by LP compressor at high engine power)
– The cross feed valve is closed
– One pack is supplied by its dedicated engine with air at 25 psi

Question 6

AIR CONDITIONNING SCHEMATIC

Answer 6

Question 7

Answer 7

Question 8

Answer 8

Question 9

PRESSURIZATION SCHEMATIC

Answer 9

Question 10

Answer 10

Question 11

Answer 11

Question 12

The bleed air SO valve auto close in case of:

Answer 12

The bleed air SO valve auto close in case of:

• No air pressure,
• Bleed duct LEAK
• Bleed duct OVHT
• Actuation of ENG FIRE handle
• UPTRIM signal from the engine alive
• Propeller brake engagement signal (Engine 1 Bleed air SO valve only)

The opening of the valve is inhibited during engine start sequence.