VENTILATION Panel

Question 1

What are some potential causes for the illumination of the BLOWER FAULT light?

Answer 1

• Low blower pressure
• Duct overheat
• Computer power supply failure
• Smoke warning activated

Question 2

What are some potential causes for the illumination of the EXTRACT FAULT light?

Answer 2

• Low extract pressure
• Computer power supply failure
• Smoke warning activated

Question 3

What condition in the avionics ventilation system would cause an external horn to sound?

Answer 3

BLOWER FAULT or EXTRACT FAULT illumination on the ground with both engines stopped.

Question 4

Describe the avionics ventilation system.

Answer 4

It is a fully automated system that considers the skin temperature and adjusts inlet and outlet flaps to optimize cooling and airflow

Question 5

OPEN CIRCUIT CONFIGURATION

Answer 5

Both the inlet and the outlet flaps are fully open (aircraft is on ground and the skin temperature is above a set threshold)

Question 6

CLOSED CIRCUIT CONFIGURATION

Answer 6

Both the inlet and outlet flaps are fully closed. The SKIN EXCHANGE INLET BYPASS VALVE is open, allowing air to the cargo under floor, eventually exiting via the outflow valve (aircraft is on the ground or in-flight and the skin temperature below a set threshold).

Question 7

INTERMEDIATE CIRCUIT CONFIGURATION

Answer 7

The inlet flap is fully closed, the outlet small flap is open (aircraft is in-flight and the skin temperature is above a set threshold).

Question 8

BLOWER or EXTRACT FAULT

Answer 8

Both inlet and outlet flaps are fully closed, SKIN EXCHANGE INLET BYPASS VALVE closed.

Question 9

SMOKE CONFIGURATION

Answer 9

Once the BLOWER and EXTRACT pushbuttons have been selected to OVRD, the blower fan will stop, the extract fan will continue to run. The inlet flap closes, the small outlet flap opens, the SKIN EXCHANGE ISOLATION VALVE closes and the SKIN EXCHANGE INLET BYPASS VALVE closes.