Air Systems Overhead COPY

Question 1

What does the FLT Deck fan switch do in the ON position? N499MC

Answer 1

On ground with all packs off: cabin air is recirculated to the flight deck.

On ground with at least one pack on: conditioned air is delivered at an increased rate to the flight deck.

In flight: Fan operation is disabled.

Question 2

What is the temperature range selectable in AUTO for the Flight Deck Temperature Selector?
What does the MAN position do?

Answer 2

18-19C.

Manually control the trim air valve to cool (close) or warm (open) the zone.

Question 3

How does the Flight Deck temperature selector operate in backup mode?

Answer 3

In backup mode 18-29C is selectable, pack output temperature is regulated to attain setting.

Auto control of Main Deck and Cabin temperature panel are inhibited.

Question 4

What does the SYS Fault light mean on the Zone Reset switch?

Answer 4

Temp zone duct overheat or Zone Temperature Controller fault has occurred.

Master Trim Air Valve failed closed.
Trim Air switch off.

Master Trim Air Valve closed and pack air continues to flow.

Question 5

What does the Zone Reset switch do when pressed?

Answer 5

Resets Zone Temperature Controller if fault is cleared.
Reopens Master Trim Air Valve if overheat is cleared
Reopens FWD or AFT LL cargo trim shut off valve if duct overheat no longer exists

Question 6

How is temperature controlled to the Main Deck in backup mode?

Answer 6

Temperature control by the Main Deck FWD and AFT temperature selectors is inhibited in backup mode. Pack output temperature controlled by Flight Deck selection.

Question 7

What does the MAN position do on the Main Deck FWD and AFT zone temperature selector?

Answer 7

Manually controls trim air valves to warm (open) or cool (close) respective zone.

Question 8

What temperature range is selectable on the Main Deck FWD and AFT selectors in AUTO mode?

Answer 8

4-29C with Lower Lobe Conditioned Air Flow Rate selected to Low or High for respective zone.

Question 9

What does the MAN position do on the Lower Lobe Temperature Selectors?

Answer 9

Manually controls trim valve positions to warm (open) or cool (close) zone with Lower Lobe Conditioned Air Flow Rate selected to Low or High for respective zone.

Resets respective Lower Lobe Conditioned Air supply duct shut off valve if closed due to overheat.

Question 10

What temperature range does the FWD and AFT Lower Lobe Temp selector allow in AUTO?

Answer 10

4-29C with Lower Lobe Conditioned Air Flow Rate selected to Low or High for respective zone.