Pressurization

Question 1

How many outflow valves are there

Answer 1

Two

Question 2

How many independent pressure controllers are there?

Answer 2

Two CPAMS

Question 3

Upon landing the aircraft depressurizes after _____?

Answer 3

60 Seconds - outflow valves command full open

Question 4

The pressure controller (CPAM) switches from standby

Answer 4

3 minutes after landing

Question 5

Outflow valves are controlled ____ ?

Answer 5

Electronically

Question 6

Outflow valves are operated ____ ?

Answer 6

Neumatically

Question 7

What is the safety feature of the outflow valves?

Answer 7

The built in safety valves open automatically at 8.6 psi and a negative pressure of -.5 psi.

Question 8

During manual pressurization control which outflow valve is controlled

Answer 8

The secondary outflow valve is directly controlled by the manual selection on the control panel.

Question 9

In Manual Mode where is the information shown?

Answer 9

Cabin Rate and Altitude can be found on the ECS, the Status and Primary page.

Question 10

The EMER DEPRESS switch does what?

Answer 10

Depressurizes the aircraft to 14,250’ +/- 750’

Question 11

On the 700 limit climb to ____ above FL___?

Answer 11

1500 fpm above FL300

Question 12

The CPAM receives information from what?

Answer 12

The standby pitot static system

Question 13

True or False - The CPAM receives info from the primary pitot static system.

Answer 13

False - it receives it’s info from the standby pitot static system

Question 14

How are the 700 / 900 pressure controllers different?

Answer 14

It only has one Pressure Controller with triple redundancy and 2 Safety Valves

Question 15

The vacuum power required to regulate the outflow valves comes from where?

Answer 15

A Jet Pump off the 10th stage bleed air system.

Question 16

What happens when a differential pressure of 8.6 psi is sensed by the CPAM

Answer 16

a “CABIN PRESSURE” aural warning with a “DIFF PRESS” warning message. The outflow valves will open to relieve the excess pressure.

Question 17

During normal operation the primary valve is controlled by what? And the secondary valve is controlled by what?

Answer 17

The CPC1 controls the primary valve and the CPC2 controls the secondary valve. They are slaved to each other.

Question 18

What happens to the secondary valve in Manual Mode?

Answer 18

The secondary valve becomes the primary valve in Manual Mode, with the primary valve slaved to it.

Question 19

What does Manual Mode do?

Answer 19

the secondary valve becomes primary and it is controlled directly by manual selection on the control panel.

Question 20

How many CPC’s on the 200?

Answer 20

Two

Question 21

How many CPC’s on the 700 / 900?

Answer 21

One

Question 22

CPAM illuminates the NO SMOKING / FASTEN SEAT BELT sign when…

Answer 22

when the cabin altitude is greater than 10,000’

Question 23

What should you do if the aircraft becomes inadvertently pressurized on the ground via the low pressure air?

Answer 23

Do not open the door!!! Start the APU and use the EMER DEPRESS switch.

Question 24

Main 700 / 900 Differences

Answer 24

Only One Outflow Valve with triple redundancy electric motors with Two Safety Valves.

Question 25

If the CPAM fails, will the O2 Masks drop.

Answer 25

No, but there will be a CABIN PRESS warning message will be generated along with the aural "CABIN PRESSURE" message.

Question 26

At what cabin altitude does the CPAM drop the masks?

Answer 26

14,000'

Question 27

What does the flight abort mode do on the CRJ 700 / 900

Answer 27

It maintains the pre pressurization altitude for the first 10 minutes

Question 28

What is the difference of outflow valves on the different variants

Answer 28

The CRJ 200 has 2 outflow valves | The CRJ 700 / 900 have only one outflow valve

Question 29

How are the 2 outflow valves controlled on the CRJ 200

Answer 29

Controlled by either of two independent cabin pressure controllers.

Question 30

Upon landing in the CRJ 200 what happens to the pressurization system?

Answer 30

After 60 seconds WOW the outflow valves are commanded full open After 3 minutes the standby controller becomes the active controller for the next flight.

Question 31

The outflow valves on the CRJ 200 are _____ controlled | and _____ operated

Answer 31

the outflow valves are electrically controlled and pneumatically operated

Question 32

How are the outflow valves pneumatically operated on the CRJ 200

Answer 32

A jet pump off the 10th stage bleed air system provides vacuum power required to regulate the outflow valves

Question 33

What happens when cabin pressure differential reaches 8.6 psi on the CRJ 200

Answer 33

An Aural "CABIN PRESSURE" warning | with a "DIFF PRESS" warning message on the EICAS

Question 34

What is the difference between the 2 outflow valves on the CRJ 200

Answer 34

They are identical except the secondary valve has bent lines that connect it directly to the manual pressurization control panel

Question 35

In manual mode, how is pressurization controlled in the CRJ 200

Answer 35

In manual mode, the secondary outflow valve is directly controlled with the primary valve slaved to it, via the jet pump which modulates the secondary outflow valve

Question 36

When Manual mode is selected on the pressurization control panel on the CRJ 200 where is the information presented?

Answer 36

ECS page Status page Primary page

Question 37

If the CPAM fails on the CRJ 200, will the PAX 02 MASKS drop when cabin altitudes reach 14,000 ft

Answer 37

NO

Question 38

The outflow valve on the CRJ 700 / 900 is _____ operated

Answer 38

Electrically Operated via DC power

Question 39

What do the safety valves on the CRJ 700 / 900 do?

Answer 39

provide over pressure and negative pressure relief

Question 40

How are the safety valves operated on the CRJ 700 / 90

Answer 40

they are pneumatically operated and spring loaded closed