Air Con / Pressurisation

Question 1

Maximum differential pressure

Answer 1

7.8psi

Question 2

Maxximum differential overpressure

Answer 2

8.1psi

Question 3

Maximum differential negative pressure

Answer 3

-0.3psi

Question 4

What does the air system consist of and what does each system supply?

Answer 4

Pneumatic system - air con, ice prot, pressurisation, eng start
Air Con - environmental control
Pressurisation - regulates discharge from cabin
Ventilation - cools equipment in FWD/AFT elec compartments

Question 5

What temperature does the pre cooler limit bleed air to?

Answer 5

299C

Question 6

What does the engine bleed valve do?

Answer 6

Automatically shuts off 1 pack below 24,600ft when ice is encountered - cold air in FD when it comes on

Question 7

What happens if the Environmental Control Units are shut off in flight?

Answer 7

Emergency ram air is supplied to the cabin

Question 8

What side of the aircraft is APU bleed air supplied to?

Answer 8

Left

Question 9

In terms of ice protection, what system supplies bleed air to the horizontal stabiliser?

Answer 9

The LEFT pneumatic system

Question 10

In terms of ice protection, what system supplies bleed air to each wing?

Answer 10

The corresponding side

Question 11

What is the split of the left and right ECU in terms of cabin / flight deck?

Answer 11

Left ECU = 60% FD / 40% pax

Right ECU = 100% pax

Question 12

At what rate does the cabin climb when in AUTO?

Answer 12

650fpm

Question 13

At what rate does the cabin descend when in AUTO?

Answer 13

450fpm