Pneumatics

Question 1

LP Manifold from the Mix valve gives low pressure to what systems

Answer 1

Cabin pressure—>then goes through heat exchanger.
Wing anti ice system
Windshield anti ice system
Hydraulic resivoir

Question 2

HP manifold delivers high pressure air to what aircraft systems?

Answer 2

Nacelle heat
Alcohol Anti ice
Pressure control (jet pump)
Temp control (torque motor)

Question 3

Flipping the Cabin air switch to on triggers what?

Answer 3

Opens the flow control valve and allows LP air to route into the heat exchanger.

Question 4

Bleed air switches have three positions and control 3 valves. What are they?

Answer 4

OFF, ON, EMER

OFF: Bleed air shut off valve energized closed. Emer press valve energized open. HP valve energized off.

EMER: Bleed air shut off valve energized open. Emer press valve de energized closed. HP shut off valve valve is de energized open.

OFF: Bleed air shut off valve energized closed. Emer press valve de energized closed. HP air shut off by the poppet valve inside mixing valve, while HP shut off is open.

Question 5

What would you do if you got one Bleed air light in flight?

Answer 5

Shut it off.

Question 6

What would you do if you got two bleed air lights in flight?

Answer 6

One in EMER position

One in OFF position

Question 7

What position does Cabin air fail in?

Answer 7

Always fails ON!

Question 8

Everything you could want to be on fails to what position?

Answer 8

On! Duh.

Question 9

You look up and see the amber EMER PRESS light, what has happened?

Answer 9

One or both Emer press valves are open

Question 10

When would you get a duct over heat?

Answer 10

600°F in either duct

250°F in either pylon