Pneumatics

Question 1

An external air connection enters through the right side of the bleed manifold. How is it introduced into the left manifold?

Answer 1

By opening the ISOLATION VALVE

Question 2

What is the corrective action for a red “L PYLON HOT” CAS message?

Answer 2

Turn off left engine bleed air switch and the left air conditioning pack switch

Question 3

What is the corrective action for a red “AFT EQUIP HOT” CAS message?

Answer 3

Determine which side has a possible bleed air leak (high TGT & fuel flow), and turn off the affected engine bleed air switch and air conditioning pack switch

Question 4

What are the minimum pressure and temperature set points of the bleed air system?

Answer 4

Normal - 14 psi
Low power settings - 22 psi
Single Pack Ops - 35 psi
Wing A/I ON - 620 F

Question 5

How is the bleed air panel configured for a bleeds-off takeoff?

Answer 5

L&R Engine bleed air switches - IN & OFF

APU bleed air switch - IN & ON

Question 6

Other than selecting the isolation valve switch to OPEN, what other switch selections will automatically open the isolation valve?

Answer 6

Selecting START MASTER or CRANK MASTER

APU BLEED AIR (on ground)

Question 7

What is the function of the RAM AIR switch?

Answer 7

Turns OFF both air conditioning packs, and allows ambient air into the cabin when the pressure vessel completely depressurizes

Question 8

Will the auto throttles be inhibited if the isolation valve is OPEN?

Answer 8

No, auto-throttles operate normally regardless of the isolation valve position