Lear 45 TCAS Pressurization

Question 1

Where are the pressurization outflow valves?

Answer 1

In the forward pressure bulkhead in front of the pilots

Question 2

What controls the outflow valves?

Answer 2

The CPC (cabin pressure controller) located on the copilot’s side of the lower instrument panel.

Question 3

What are the maximum feet per minute schedules for climb and descent when the cabin pressure controller is in automatic mode?

Answer 3

600fpm climb and 375 fpm in the descent

Question 4

How many control channels operate the outflow valves?

Answer 4

Two - one for each channel. Each channel is also powered by a different bus so that there is redundancy built into the system. The right channel receives power from the Emergency battery bus.

Question 5

What happens if both channels of the CPC fail?

Answer 5

The outflow valves will close when a cabin pressure equal to a Delta P of 9.7 psid is reached.

Question 6

At what cabin altitude will the outflow valves automatically close?

Answer 6

13700 feet.

Question 7

What is the failure mode of the outflow valves?

Answer 7

Closed

Question 8

What does the “Manual” knob do on the cabin pressure controller?

Answer 8

It changes the rate of descent or climb 100 fpm for each click of the knob.

Question 9

When is an airport considered high altitude with respect to cabin pressure controller?

Answer 9

Any airport above 8000 feet.