Air Conditioning

Question 1

What bleed sources can be used for ECS?

Answer 1

Engines, APU below 20,000, and ground cart on ground.

Question 2

Aside from an air source, what else is required for operation of the ECS system?

Answer 2

DC power

Question 3

Describe how bleed air is cooled in the ECS system.

Answer 3

Bleed air is first cooled by fan air. From the main manifold air will flow into the PACK where it will pass through 2 heat exchangers a compressor and a turbine. Air exiting the ACM should be near 35ºF.

Question 4

How is cabin temperature normally maintained?

Answer 4

Trim air valves will mix hot bleed air and cold air from the ACM to get temperature. Normally the AMSC will command trim valves to adjust temp.

Question 5

In the event of a malfunction involving the AMSC how can the cabin/cockpit air be controlled?

Answer 5

MAN Temp Control will let you manually adjust trim air valves.