Pneumatics

Question 1

What engine stages provide bleed air?

Answer 1

9th
• Always available.

14th
• Only depending on system demand for low thrust or anti-icing.

Question 2

PACK automatic shut down?

Answer 2

1. Anti-icing on below 24,600ft, PACK 1 shuts off.
2. Max thrust with engine bleed valves open and;
   – Singe engine up to 9,700’ AGL
   – Both engines up to 1,700’ AGL
   If both packs close in flight, ram air valves open and recirculation fans turn off. (Ram air always closed on the ground)

Question 3

Gaspers

Answer 3

Cannot turn off on ground.

Question 4

Auto Pressure

Answer 4

Sets to 8,000ft if you forget to set it.

Question 5

Dump button

Answer 5

Opens both OFVs to try and hold cabin between 14,000–15,000 feet.
Button doesn’t work in Manual mode.

Question 6

Anti-Icing for

Answer 6

1. Engine inlets
2. Wings (Fail to the open position)
3. Horizontal Stab

Question 7

Anti-Icing turns on when

Answer 7

Auto
• Ground above 25 knots and ice detected, all on.

All
• In flight.
• Ground above 25 knots.

Eng
• When engine running.

Question 8

When do probes get heat?

Answer 8

All sensors EXCEPT TAT when one engine is turned on..

TAT turn on with weight off wheels or override set to ENG.