Ventilation Panel

Question 1

What is the purpose of the CABIN FANS?

Answer 1

To re-circulate cabin air to the mixing chamber and then back to the cabin

Question 2

With BLOWER and EXTRACT pushbuttons in AUTO how does the system operate?

Answer 2

Ground – system is normally in the OPEN configuration.
Flight – system is normally in the CLOSED configuration.
Intermediate – Closed configuration except small internal flap in Extract Valve is open.

Question 3

With both BLOWER and EXTRACT pushbuttons in OVRD (smoke configuration) what are the positions of the INLET and EXTRACT valves?

Answer 3

INLET valve CLOSED

EXTRACT valve INTERMEDIATE

Question 4

What is the status of the Blower and Extract fans with the Blower and Extract valves in OVRD?

Answer 4

BLOWER fan OFF

EXTRACT fan ON

Question 5

When is air conditioning introduced into the avionics compartment?

Answer 5

Abnormal operation

SMOKE configuration

Question 6

Is the skin heat exchanger ever bypassed in flight?

Answer 6

Yes, during SMOKE configuration

Question 7

What does an amber FAULT light on the BLOWER pushbutton indicate?

Answer 7

SMOKE warning is activated.
Computer power supply failure.
Low blower pressure.
Duct overheat.

Question 8

What does an amber FAULT light on the EXTRACT pushbutton indicate?

Answer 8

SMOKE Warning is activated.
Computer power supply failure.
Low Extract pressure.

Question 9

With 2 FAULT lights on the VENTILATION panel are there any other indications?

Answer 9

Yes – The SMOKE light in the GEN 1 LINE pushbutton