Pressurization

Question 1

When do recirculation fans not work?

Answer 1

When DUMP button is pressed.
Smoke is detected in the recirculation bay.
The perspective pack is off.

Question 2

Where does air in graspers come from?

Answer 2

Air from the right recirculation fan.

Question 3

Cargo ventilation.

Answer 3

Forward comes from the cabin and then vented off….. Aft is not vented.

Question 4

Emergency ram air ventilation.

Answer 4

Left side ram opens if in flight and both packs are commanded off or failed and below 25,000 feet.

Question 5

What do recirculation fans do?

Answer 5

Help reduce the work load on the packs by recirculating already conditioned air and remixing it with incoming air in flight deck and cabin… Provides a mix of 52% fresh air and 48 recirculated.