Pneumatic System

Question 1

What is the range of the bleed air for engine start?

Answer 1

14 - 40 psi

Question 2

What are the key temperatures associated with bleed air?

Answer 2

400 degrees - normal manifold temperature
620 degrees - manifold temperature when wing anti-ice is requested
500 degrees - single pack operations

Bleed air controller is making these decisions

Question 3

What is the 8th stage set point for single pack operations?

Answer 3

35 psi

Question 4

What is the 8th stage set point for idle, long-range cruise, etc?

Answer 4

24 psi

Question 5

What temperature range is available to the pilot in automatic? Manual?

Answer 5

60 - 90 degrees when in automatic.

35 - 230 degrees when in manual.

Question 6

When and how will the aircraft depressurize after landing?

Answer 6

It will depressurize automatically 90 seconds after landing.

Question 7

When can we get the CABIN PRESS LOW caution capsule?

Answer 7

Only while still in “flight” and the cabin pressure exceeds 8000’.

Question 8

Cabin Differential in amber is what psi differential? Cabin Differential in red is what psi differential?

Answer 8

10. 17 - normal max differential
11. 28 - amber CAS
12. 48 - red CAS