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CRJ700 Systems > Pressurization and Air conditioning > Flashcards

Pressurization and Air conditioning Flashcards

1
Q

What are the maximum and minimum relief differential pressure?

A

8.7 psi to -.5psi

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2
Q

During taxi, takeoff and landing, what is the maximum differential pressure?

A

0.1psi

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3
Q

Why is the maximum differential pressure 0.1 psi for taxi, takeoff and landing?

A

To allow the doors to easily open in the event of an emergency evacuation

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4
Q

L and R PACK switchlight

What happens when pushed out?

A

The pack flow control valve closes and the White OFF light illuminates

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5
Q

L and R PACK switchlight

What happens when pushed in?

A

The pack flow control valve opens and the White off light extinguishes

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6
Q

L and R PACK switchlight

What does the amber fault light mean?

A

Fault means the pack has failed in both auto and manual mode due to an over temperature or over pressure condition

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7
Q

Reverie fan switch?

A

Turns both recirculating fans on/off

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8
Q

RAM-AIR guarded switchlight

What happens when pushed in?

A

Ram-Air valve will open and he white OPEN light illuminates along with a white status message on ED2

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9
Q

CKPT MAN and CABIN mode switch lights

What happens when pushed in?

A

Control of the temperature control valve is given to the spring loaded manual toggle switches and the switchlight illuminates White

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10
Q

CKPT MAN and CABIN mode switch lights

What happens when pushed out?

A

Pressing again (switch out) will place the associated temperature control valve back in auto

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11
Q

Man rate selector

What does it do?

A

Electrically adjusts the position of the outflow valve to control rate of change

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12
Q

Which engine normally provides bleed air to which pack?

A

The left engine to the left pack and right engine to right pack

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13
Q

How is the bleed air from both engines kept separate?

A

The isolation valve

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14
Q

Can the left engine provide bleed air to the right pack? Is so, how?

A

Yes. By selecting ISOL switch open, the bleed source rotary selector to L engine and then placing the bleed valves rotary selector manual.

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15
Q

How is the ISOL switch normally positioned?

A

Closed

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16
Q

What does the cabin pressure controller do?

A

Independently acquired and monitors cabin pressure, outside air pressure, differential pressure, and rate of change information and commands the outlaw valve to move based on this information

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17
Q

How many automatic cabin pressure controllers are there and why?

A

Two. One is active and the other is in standby ready to assume control of the active controller fails.

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18
Q

What does the CPAM (cabin pressure acquisition module) do?

A

1st- gathers cabin pressure and rate of change information to display on the EICAS
If both CPCs fail this information allows the crew to know they should operate the outflow valve.
2nd- commands the passenger oxygen masks to deploy and the seatbelt no smoking signs to illuminate if the cabin altitude exceeds 14000’

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19
Q

Describe how to manually control cabin pressure…

A

Push the pressure control switchlight and adjust the man rare knob full decrease. Then move the Man alt switch either up or down depending on if you want the cabin to climb or descend.

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20
Q

How many outflow valves are there?

A

One

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21
Q

How is the outflow valve powered?

A

Electrically by three separate electric motors

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22
Q

What commands the three outflow valve motors?

A

Motor 1- CPC 1
Motor 2- CPC 2
Motor 3- manually controller by the pilot with the man rate and man alt knobs

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23
Q

During automatic mode when the CPCs are in control, how many operational phases are there?

A

Seven

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24
Q

Name the CPCs operational phases.

A 
Ground phase
Takeoff phase
Flight abort phase
Climb/cruise phase
Descent phase 
Landing phase
Touch and go phase
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25
Q

What does flight abort phase do?

A

Assume the departure field elevation will be the landing field elevation until the airplane climbs through 6000’ or ten min passes

26
Q

What is the EMER DEPRESS button used for?

A

In an emergency the crew can push to depressurize the airplane. It’s prohibited above 15000’

27
Q

When will the cabin altitude aural warnings sound?

A

At a differential of 8.7

28
Q

Will the cabin fully decompress while flying at 41000’?

A

No. The cabin will depressurize up to a cabin altitude of 14500’ plus or minus 500

29
Q

What does the ground valve do?

A

It ensures the cabin is depressurized on the ground and increases airflow for avionics cooling

30
Q

When does the ground valve open and close?

A

The ground valve closes when the main cabin door is closed prior to departure and opens after landing with weight on wheels

31
Q

What does the OVBD COOL FAIL status message indicate?

A

The found valve failed to open after landing

32
Q

What does the PACK acronym stand for?

A

Pneumatic Air-Conditioning Kit

33
Q

Which PACK provides cooling to the cockpit? Which to cabin?

A

Normally LEFT PACK to the cockpit and RIGHT to the cabin

34
Q

Can the left pack provide cooling to the cabin if the right pack fails?

A

Yes

35
Q

How can the left pack provide cooling to the cabin if the right pack fails?

A

Both packs provide air to the mixing manifold under the aft cargo. Internal baffling in the mixing chamber will allow either packers air to both the cockpit and cabin

36
Q

How is the cabin temperature manually adjusted?

A

Push the MAN CABIN button to take manual control of the temperature control valve, then move the HOT COLS switch in the desired direction for the cabin temperature

37
Q

Can the aircraft be flown with one pack inoperative?

A

Yes, but the flight is limited to 31000’

38
Q

What is the maximum cabin differential pressure?

A

+8.7psi and -0.5psi, 0.1psi during taxi

39
Q

What protects the airplane from overpressure or negative pressure situations?

A

Two safety valves one for overpressure and one for negative pressure

40
Q

From what engine stages can bleed air be extracted from?

A

The 6th stage under normal operations and a 10th stage HPV for high demand situations

41
Q

Can air be taken from the 6th and 10th stage simultaneously?

A

No. There is a one way check valve

42
Q

When does bleed air switch from the APU to the engines after takeoff?

A

After takeoff when the thrust levers are pulled out of the TOGA detent with the gear up and flaps at 20’ or less

43
Q

When does the bleed air switch from the engines to the APU on approach?

A

With he gear OR flaps extended 20’ or greater, with thrust out of TOGA

44
Q

Describe the function of the Load Control Valve.

A

The LCV regulates the flow of air from the APU

45
Q

What’s the APUs priority pneumatic or electric?

A

He APUs primary purpose is to provide electric power

46
Q

What manages bleed air distribution and the air conditioning system?

A

Two air conditioning systems controllers ACSC 1 & 2

47
Q

Is the external ground air connector displayed on the ECS page?

A

No. However a digital air pressure readout will indicate external air is being provided

48
Q

What emergency situation requires RAM-AIR switchlight to be pressed?

A

When emergency ventilation of the cabin is required

49
Q

Where does ram air come from?

A

A scoop at the base of the vertical stabilizer

50
Q

What is the water extracted from the pack used for?

A

It is sprayed across the pack heat exchangers in the ram air duct

51
Q

When does the CABIN PRESSURE aural warning sound?

A

If the cabin alt exceeds 10000’ or the pressure differential exceeds 8.7 psi

52
Q

Which hydraulic systems are cooled by ram air?

A

Systems 1 and 2

53
Q

How many recirculating fans are there?

A

One switch but 2 fans

54
Q

How are the cockpit avionics and displays cooled?

A

They’re cooled by dedicated cooling fans

55
Q

If both display fans fail how are the displays kept cool?

A

STDBY should be selected on the DISPLAY FAN rotary selector which allows conditioned cockpit air to cool them

56
Q

What does the AMBER CABIN ALT caution message indicate?

A

Cabin altitude is between 8500’- 10000’

57
Q

Generally describe the journey of air from outside the airplane thriving the airplane and back outside.

A

Air enters engine
Ducted to packs as hot bleed air
Enters cabin as conditioned air
Exits to outside through outflow valve

58
Q

What is the function of the pressure regulating shutoff valve (PRAOVs)?

A

The PRSOVs modulates as commanded by the Air Conditioning System controllers to maintain approximately 45psi -/+3 in the bleed air manifolds

59
Q

Briefly describe the fundamental last behind an Air Cycle Machine (ACM)

A

An air cycle machine cycles hot air into cold air. Accomplished by compression and expansion. Compressed inside the ACM causing temperatures to rise. Air is cooled via liquid cooled heat exchangers and allowed to rapidly expand out of the ACM. As air rapidly expands its temperature drops dramatically completing the cycle.

60
Q

What is the function of the packs Hot Air Shutoff valve?

A

The hot air shut off valve opens at higher altitudes to supplement the pre-cooled air provides the packs flow control valve

61
Q

Describe the flow of air through the PACK components

A 
Precooler 
Heat Exchanger (primary)
Compressor
Heat Exchanger (secondary)
ReHeater
Condenser 
Water Extractor 
Turbine (expansion turbine)

CRJ700 Systems (17 decks)

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