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Flashcards in Avionics Vent Deck (9)
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1

In the “Ground” Mode at High Skin Air temperatures, which Config is in operation?

Open-circuit configuration

2

In the “Ground” Mode at Low Skin Air Temperatures, how is the Circulatory Air now cooled?

Closed-circuit configuration via the skin-heat exchanger.

3

In the “Flight” Mode at Low Skin Air Temperatures which Config is in operation?

Closed circuit configuration

4

In the “Flight” Mode at High Skin Air Temperatures which Config is in operation?

Intermediate configuration.

5

What causes the system to transit from the GROUND mode to the FLIGHT mode?

Takeoff power set & weight on wheels

6

When might you have to put both switches (BLOWER and EXTRACT) to OVERRIDE?

Smoke / fumes / avionics smoke

7

What causes a BLOWER or EXTRACT FAULT light to illuminate?

Blower & Extract:
- Pressure is low inhibits for engine shut down.
- Computer power supply falls
- Smoke warning is activated

Blower Only:
- Duct overheat (blower)

8

What happens when the BLOWER is selected to OVERRIDE?

When either p/b switch is on OVRD:
- The system goes to closed circuit configuration.
- Air from the air conditioning system is added to ventilation air.
- The blower fan stops if BLOWER p/b is on OVRD.
- Cargo compartment is not ventilated

9

What happens when the BLOWER and EXTRACT are selected to override? (E.g. during AVIONICS SMOKE)

When both p/b SW are on OVRD:
- The system goes to closed circuit configuration.
- The extract fan continues to run
- The blower fan stops
- Air flows from the air conditioning system and then overboard
- Cargo compartment is not ventilated if you are in any abnormal modes / have either of the OVRD or EXTRACT pb's pressed.