Systems - Pressurization

Question 1

When you press the EMER DEPRESS button, how does it depressurize the airplane (200)?

Answer 1

When EMER DEPRESS is selected, both outflow valves open. Above 15,000ft. the Altitude limiter will prevent cabin altitude from exceeding 14250 +/- 750ft

Question 2

When you press the EMER DEPRESS button, how does it depressor the airplane (700/900)?

Answer 2

The manual DC motor will drive the outflow valve fully open. The microprocessor restricts the cabin altitude to a maximum of 14,500 +/- 500ft

Question 3

How many pressure controllers do we have?

Answer 3

Three. One manual controller and two automatic CPCs which control all automatic phases of pressurization. Only one CPC is active at any time, the other is in standby mode.

Question 4

Do the pressure controllers change, and if so when?

Answer 4

Pressure controllers automatically change after aircraft has been on the ground for 3 minutes. In case of a failure of the current Pressure Controller, automatic changeover occurs.

Question 5

Can we change the Pressure Controllers Manually?

Answer 5

Yes, by pressing the PRESS CONTROL switchlight twice on the CABIN PRESS control many will select the other auto controller. Selecting it once will put the aircraft into manual pressurization mode.

Question 6

What system will automatically deploy the passenger oxygen masks and when (200)?

Answer 6

CPAM - Cabin Pressure Acquisition Module: IF cabin altitude reaches 14,000ft, Pass Oxy masks are deployed automatically by the CPAM> In the event of CPAM failure, the standby pressure controller assumes functions of the CPAM but will not deploy the masks.

Question 7

What system will automatically deploy the passenger oxygen masks and when (700/900)?

Answer 7

Cabin Pressure Control Panel microprocessor will deploy the masks if cabin pressure reaches 14,000 ft.