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Systems Review > Pressurization > Flashcards

Pressurization Flashcards

1
Q

How many outflow valves are there

A

Two

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2
Q

How many independent pressure controllers are there?

A

Two CPAMS

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3
Q

Upon landing the aircraft depressurizes after _____?

A

60 Seconds - outflow valves command full open

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4
Q

The pressure controller (CPAM) switches from standby

A

3 minutes after landing

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5
Q

Outflow valves are controlled ____ ?

A

Electronically

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6
Q

Outflow valves are operated ____ ?

A

Neumatically

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7
Q

What is the safety feature of the outflow valves?

A

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

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8
Q

During manual pressurization control which outflow valve is controlled

A

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

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9
Q

In Manual Mode where is the information shown?

A

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

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10
Q

The EMER DEPRESS switch does what?

A

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

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11
Q

On the 700 limit climb to ____ above FL___?

A

1500 fpm above FL300

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12
Q

The CPAM receives information from what?

A

The standby pitot static system

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13
Q

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

A

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

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14
Q

How are the 700 / 900 pressure controllers different?

A

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

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15
Q

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

A

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

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16
Q

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

A

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

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17
Q

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

A

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

18
Q

What happens to the secondary valve in Manual Mode?

A

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

19
Q

What does Manual Mode do?

A

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

20
Q

How many CPC’s on the 200?

A

Two

21
Q

How many CPC’s on the 700 / 900?

A

One

22
Q

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

A

when the cabin altitude is greater than 10,000’

23
Q

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

A

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

24
Q

Main 700 / 900 Differences

A

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

25
Q

If the CPAM fails, will the O2 Masks drop.

A

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

26
Q

At what cabin altitude does the CPAM drop the masks?

A

14,000’

27
Q

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

A

It maintains the pre pressurization altitude for the first 10 minutes

28
Q

What is the difference of outflow valves on the different variants

A

The CRJ 200 has 2 outflow valves

The CRJ 700 / 900 have only one outflow valve

29
Q

How are the 2 outflow valves controlled on the CRJ 200

A

Controlled by either of two independent cabin pressure controllers.

30
Q

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

A

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.

31
Q

The outflow valves on the CRJ 200 are _____ controlled

and _____ operated

A

the outflow valves are electrically controlled and pneumatically operated

32
Q

How are the outflow valves pneumatically operated on the CRJ 200

A

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

33
Q

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

A

An Aural “CABIN PRESSURE” warning

with a “DIFF PRESS” warning message on the EICAS

34
Q

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

A

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

35
Q

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

A

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

36
Q

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

A

ECS page
Status page
Primary page

37
Q

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

A

NO

38
Q

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

A

Electrically Operated via DC power

39
Q

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

A

provide over pressure and negative pressure relief

40
Q

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

A

they are pneumatically operated and spring loaded closed

Systems Review (4 decks)

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