VENTILATION, ENG PANEL

Question 1

ENG MAN START 1(2) wire black guarded pb

“ON”(cyan) when selected and the start valve opens if….?

Answer 1

The ENG MODE selector is set to CRANK or IGN/START.

Question 2

N1 MODE 1(2) black wire guarded pb

“ON”(cyan) when selected; Thrust control reverts from EPR mode to N1 rated mode.

What is lost?

Answer 2

Autothrust and Alpha Floor

Question 3

BLOWER pb FAULT?

Answer 3

A- Avionics smoke activation
B- Blower fan low
C- Computer power supply fail
D- Duct overheat

Question 4

EXTRACT pb FAULT?

Answer 4

A- Avionics smoke activation
B- Blower fan low
C- Computer power supply fail

Question 5

What happens when BLOWER pb is in OVRD?

Answer 5

• Blower fan is stopped
• Extract fan continues.

The system is in “closed-circuit configuration” and adds air from the AC to the ventilation air.

The skin heat exchanger and AC air cool the avionics duct.

Question 6

What happens when EXTRACT pb is in OVRD?

Answer 6

• Both fans continue to run.
• Extract fan is controlled directly from the pb.

The system is in “closed-circuit configuration” and adds air from the AC to the ventilation air.

The skin heat exchanger and AC air cool the avionics duct.

Question 7

If both blower and extract in override, what fans run?

Answer 7

Only the extract.

Question 8

Where does cooling air come from if both pbs are in OVRD?

Answer 8

The AC system supplies the cooling air, then exhausted overboard.

Both in OVRD is the avionics duct smoke configuration