Section 11 - Air Conditioning

Question 1

In high ambient temperatures on the ground (greater than +35° C / 95° F) after APU start, how can the cabin be cooled down most efficiently?

Answer 1

Select full cold manual mode, close all doors, minimize electrical loads

Question 2

What is the function of the RAM AIR switch?

Answer 2

Closes both air conditioning pack valves, allowing outside air to the cabin

Question 3

How does the engine START switch and the START MASTER switch affect operation of the air conditioning packs?

Answer 3

The engine START MASTER switch turns off the right pack, and the engine START switch turns off the left pack

Question 4

How is moisture from the pack air output used to improve system efficiency?

Answer 4

Moisture removed from the air by each pack is sprayed into the duct above the heat exchangers, making them more efficient

Question 5

If a cabin overhead vent {gasper) is opened, what will the temperature of the air coming out of it be?

Answer 5

Slightly warmer than freezing

Question 6

What actions will cause the air conditioning shutoff valves to close?

Answer 6

Selection of either pack switch, selection of the RAM AIR switch, or an amber “COOL TURB HOT” CAS message on the ground

Question 7

After landing in PHX on a hot day, an amber “L COOL TURB HOT” CAS message illuminates. Describe the procedures associated with this abnormality.

Answer 7

1. The air conditioning shutoff valve automatically closes 2. Associated Air Conditioning Pack Switch - OFF

Question 8

While in cruise flight {in IMC), an amber “UNDER FLOOR O’HEAT” CAS message illuminates. Describe the procedures associated with this abnormality.

Answer 8

1. If wing anti-ice is on, select left wing OFF 2. If message persists, select right wing OFF 3. Wait 2 minutes 4. If message persists, depart icing conditions 5. If message extinguishes, re-establish wing anti-ice using the anti-ice switch which did not cause the message to extinguish

Question 9

While in cruise flight {in IMC), an amber “UNDER FLOOR O’HEAT” CAS message illuminates. Describe the procedures associated with this abnormality.

Answer 9

1. If wing anti-ice is on, select left wing OFF
2. If message persists, select right wing OFF
3. Wait 2 minutes
4. If message persists, depart icing conditions
5. If message extinguishes, re-establish wing anti-ice using the anti-ice switch which did not cause the message to extinguish