Pressurization Ch. 13

Question 1

What are the two modes of the pressurization system?

Answer 1

Auto and manual

Question 2

Where does the pressurization system derive data from during the auto mode?

Answer 2

FMS

Question 3

What is the cabin altitude of 45,000 feet?

Answer 3

7000

Question 4

What displays cabin altitude, cabin rate of climb/descent, differential pressure, and outflow valve position?

Answer 4

The cabin pressure controller

Question 5

What does the outflow valve do?

Answer 5

Modulates airflow from the ECS to control cabin pressure

Question 6

While in automatic mode, what is the primary means of over pressure relief?

Answer 6

Outflow valve

Question 7

What is the purpose of the safety valve?

Answer 7

Provide positive/negative differential pressure relief

9.35 - CAS msg
9.45 - SV opens
9.55 - structural limitation “pack to off”CAS

Question 8

What is the cabin pressure altitude limitation?

Answer 8

Max - 15,200’

Prevented from exceeding 14,800 + 400’ by the independent Altitude Limit Switching Assembly (in case of failure of the two redundant altitude limit features)

Question 9

High cabin altitude warning

Answer 9

Limited to 14,750 when below 25,000
and when:

In ground mode
Takeoff/landing altitude 8,000+

Or

Limited to 10,000 when at 25,000 and when:

Takeoff/landing elevation below 8,000

Question 10

What is automatic oxygen set to?

Answer 10

14,750 for high cabin takeoff/landing (TFE/LFE > 8,000)

13,500 otherwise

Question 11

What’s the time to close the OFV?

Answer 11

Auto: 12 +/- 2 second
Manual: 55 seconds max

Question 12

If a loss of power occurs, how does the outflow valve fail?

Answer 12

In the closed position