Pneumatic system

Question 1

The pneumatic system supplies the following aircraft systems:

Answer 1

– Air conditioning
– Ventilation
– Pressurization
– De-icing

Question 2

LEAK

Answer 2

Activates when T° detected by bleed loop exceeds 153 ±8°C. CAP. Auto closure after 1’’ of following valves: Bleed, HP, pack and GND Xfeed.
If left bleed leak affected DO NOT RESET BLEED.

Question 3

OVHT

Answer 3

Either duct temp switch above 274°C. CAP. Auto closure bleed valves (LP and HP). May be reset after cooling

Question 4

ENG BLEED

Answer 4

Controls both bleed and HPvalves. Spring loaded closed. Must have air and electricity to open Auto closure when OVHT, leak, overpressure, fire T pulled, when UPTRIM is triggered or prop break on (left one only).
Inhibited during eng start

Question 5

ENG BLEED - FAULT

Answer 5

Bleed valve disagreement with selected position (or in case of OVHT or LEAK). CAP.
Associated valves auto closed

Question 6

PACK VALVE

Answer 6

Spring loaded closed. Must have air and elect power to open. 6’’ delay on RH valve for pax comfort

Question 7

PACK VALVE - FAULT

Answer 7

Pack valve disagreement with pb / or OVHT downstream pack comp. (>204°C). CAP.
Valve auto closed. Ground cooling turbo fan failure

Question 8

GRD X FEED

Answer 8

Spring loaded closed. Ground only inhibited in flight. Auto opens when only one bleed valve is opened