Air Conditioning

Question 1

In high ambient temperatures on the ground (greater than +35C/+95F) 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 bother air conditioning pack valves, allowing outside air to the cabin

Question 3

What is the function of the AUTO TEMP SELECT switch?

Answer 3

Allows auto temp selection to be displayed on the overhead temp display

Question 4

What is the function of the TEMP DISPLAY “ZONE” switch?

Answer 4

Allows the actual temp of the 3 zones to be displayed in the overhead display window

Question 5

What is the function of the TEMP DISPLAY “DUCT” switch?

Answer 5

Allows the actual temp of each duct forward of the trim air valves to be displayed in the overhead display window

Question 6

What is the function of the AUTO / MANUAL SELECT switches?

Answer 6

Allows the rheostat to set desired temp in the AUTO or MANUAL position

Question 7

What is the temp range of the air conditioning system rheostat controls in the AUTO position?

Answer 7

60-90 degrees F

Question 8

What is the temperature range of the air conditioning system rheostat controls in the MANUAL position?

Answer 8

35-230 degrees F

Question 9

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

Answer 9

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

Question 10

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

Answer 10

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

Question 11

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

Answer 11

Slightly warmer than freezing