Air Conditioning

Question 1

What computer controls the air conditioning?

Answer 1

Zone regulator (1x)
Pack regulators (2x)

Question 2

What conditions cause the pack flow control valves to close?

Answer 2

• If an ENG FIRE pb is selected on the overhead fire panel
• Selecting the DITCHING pb to ON
• Lack of air flow, the valves are spring, loaded to close
• A pack overheat

Question 3

What flow rate is selected when the pack flow selector is selected to LO?

Answer 3

80% of normal flow rate

Question 4

What flow rate does the pack flow selector request when selected to HI?

Answer 4

120% of normal flow rate

Question 5

When is HI flow automatically selected?

Answer 5

• operating on a single pack
• the APU is providing bleed air

Question 6

What limitation exists in regards to the use of low pressure external air?

Answer 6

It’s use simultaneously with pack air is prohibited.

Question 7

How can one tell if low pressure external air is in use?

Answer 7

• Asking ground
• Listen for air flow through the vents
• Check for moderate temperatures on the COND page

Question 8

What happens if both channels of the zone regulator fail?

Answer 8

The pack regulators control the temperature to an average temperature 

Question 9

What is the temperature range of the zone temperature selectors?

Answer 9

From 18° to 30° in 2° increments