ACS

Question 1

What is the default temperature for the ACS?

Answer 1

21°C

Question 2

Below which value of Ng will the ACS shut down?

Answer 2

When Ng < 62%

Question 3

From which engine stages does the ACS bleed its air?

Answer 3

Under normal operations, P2.5.
When the engine power is low (Ng < 80%), a high pressure valve will bleed air from P3, thus closing the low pressure non-return valve over the P2.5 bleed.

Question 4

Where is the VCCS located?

Answer 4

In the battery bay on the starboard side.

Question 5

What will an amber “ACS Low Inflow” CAS message indicate? (5)

Answer 5

1. The pressure in the ACS vents is higher than 40 PSI
2. The temperature in the vents upstream of the heat exchanger is higher than 290°C
3. The temperature downstream of the water separator is higher than 105°C
4. The ACS shut-off valve is closed
5. The CPCS cannot achieve the desired pressure in the cabin (might indicate low depressurization)

Question 6

What is the difference between the ACS, the CPCS, the ECS and the VCCS?

Answer 6

1. The ACS provides air to the cabin.
2. The CPCS controls the airflow living the cabin.
3. The ECS allows the pilot to control the tempertaure and to an extent, the pressure inside the cabin.
4. The VCCS is a separate system that does not use bleed air from the engine and whose purpose is to boost the capacities of the ACS/ECS.

Question 7

What cabin altitude is maintained in the cabin with a pressure differential of 5.75 PSI when flying at 30.000 ft?

Answer 7

10.000 ft

Question 8

When will the Pressure Relief Valve open?

Answer 8

When the pressure differential > 6.35 PSI

Question 9

When will the outflow valve be shut by the CPCU?

Answer 9

When cabin Z > 14.500 ft

Question 10

Where does P2.5 bleed the air from?

Answer 10

From the compressor.

Question 11

Where does the P3 bleed the air from?

Answer 11

From the turbine.