Pressurization

Question 1

When does the red “CABIN DFRN 9.8” CAS message illuminate?

Answer 1

When the pressure in the cabin is 9.8 psid or greater

It also illuminates when performing an EICAS test

Question 2

An amber “CABIN PRESS MANUAL” CAS message illuminates with no other action performed by the crew. What does this indicate?

Answer 2

The pressurization system has automatically switched to manual control

Question 3

When the Cabin Pressure Control is selected to AUTO and FLIGHT the pressurization system will look at:

Answer 3

The higher of the FLIGHT or LDG tapes.

Question 4

What is indicated by a red “CABIN PRESSURE LOW” CAS message?

Answer 4

Cabin altitude has climbed above 9,250 feet (+/- 750 feet)

Question 5

In the event that the cabin pressurization rate limit of 3000 feet per minute is exceeded, what would happen?

Answer 5

The cabin pressure will vent automatically via the safety valve

Question 6

When would depressurization rate limiting occur?

Answer 6

If the cabin climbs at 3000 feet per minute or more, the outflow valve will automatically close using DC motor operation, to attempt to maintain cabin
pressure

Question 7

Assuming that the passenger oxygen system is armed (AUTO), at what cabin altitude will the masks drop?

Answer 7

13,000 feet (± 500 feet)

Question 8

If the “FLIGHT” tape on the cabin pressure controller is set to FL220 and the “LANDING” tape is set to 3000 feet, what will be the resulting cabin altitude in cruise flight?

Answer 8

3000 feet, because the corresponding cabin altitude at 22,000 feet is sea level;
the cabin cruises at the higher of the 2 tapes with the switch set to “FLIGHT”