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PSA New Hire Training > CRJ 700 Air Conditioning & Pressurization > Flashcards

CRJ 700 Air Conditioning & Pressurization Flashcards

1
Q

Which engine normally provides bleed air to which pack?

A

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

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2
Q

How is the bleed air from both engines kept separate?

A

The isolation valve

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3
Q

Can the Left engine provide bleed air to the right pack? If so how?

A

Yes. By selecting the ISOL switch to OPEN, the BLEED SOURCE rotary selector to L ENG, and then placing the BLEED VALVES rotary selector in MANUAL

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4
Q

How is the ISOL switch normally positioned?

A

CLSD

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5
Q

What does the Cabin Pressure Controller do?

A

It independently acquires and monitors cabin pressure, outside air pressure, differential pressure, and rate of change information and commands the outflow valve to move based on this information

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6
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 if the active controller fails

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7
Q

What does the CPAM (Cabin Pressure Acquisition Module) do?

A

First, it acquires cabin pressure and rate of change information for display on the EICAS. In the event both CPCs fail, this information will let the crew know how they should manually operate the outflow valve. Second, it commands the passenger oxygen masks to deploy and the seatbelt no smoking signs to illuminate if the cabin altitude exceeds 14,000 feet.

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8
Q

Describe how to manually control the cabin pressure

A

Push the PRESS CONTROL switch light, and adjust the MAN RATE knob to full decrease. Then move the MAN ALT switch either up or down depending on if you want the cabin to climb or descend. To increase the rate of change, slowly move the MAN RATE knob toward the increase position.

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9
Q

How many outflow valves are there?

A

One

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10
Q

How is the outflow valve powered?

A

Electrically (not pneumatically) by three separate electric motors

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11
Q

What commands the three outflow valve motors?

A

Motor 1 - CPC 1
Motor 2 - CPC 2
Motor 3 - Manually controlled by the pilot with the MAN RATE & MAN ALT knobs

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12
Q

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

A

Seven

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13
Q

Name the CPC’s operational phases

A 
Ground phase
Takeoff phase
Flight abort phase
Climb/cruise phase
Descent phase
Landing phase
Tough and go phase
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14
Q

What does the flight abort phase do?

A

It will assume the departure field elevation will be the landing field elevation until the airplane climbs through 6,000 feet or ten minutes passes

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15
Q

What is the EMER DEPRESS button used for?

A

In an emergency the crew can push it to depressurize the airplane. Its use is prohibited above 15,000 feet

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16
Q

When will the cabin altitude aural warning sound?

A

At a differential pressure of 8.7

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17
Q

Will the cabin full decompress while flying at 41,000 feet?

A

No. The cabin will depressurize up to a cabin altitude of 14,500 feet plus or minus 500

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18
Q

What does the ground valve do?

A

It ensures the cabin is depressurized on the ground, and increases air flow for avionics cooling

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19
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

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20
Q

What does the OVBD COOL FAIL status message indicate?

A

The ground valve failed to open after landing

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21
Q

What does the PACK acronym stand for?

A

Pneumatic Air-Conditioning Kit

22
Q

Which Pack provides cooling to the cockpit? Which to the Cabin?

A

Normally the left pack to the cockpit, and the right to the cabin

23
Q

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

A

Yes

24
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 pack’s air to both the cockpit and cabin

25
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 COLD switch in the desired direction for the cabin temperature

26
Q

Can the aircraft be flown with one pack inoperative?

A

Yes, but the flight is limited to 31,000 feet

27
Q

What is the maximum cabin differential pressure?

A

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

28
Q

What protects the airplane from overpressure or negative pressure situations?

A

Two safety valves, one for overpressure, and one for negative pressure

29
Q

From what engine stages can bleed air be extracted from?

A

The 6th stage under normal operations and a 10th stage HPV (high pressure valve) for high demand situations (anti-ice on, or low power settings)

30
Q

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

A

No. There is a one-way check valve

31
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

32
Q

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

A

With the gear or flaps extended to 20° or greater, with thrust out of TOGA

33
Q

Describe the function of the Load Control Valve

A

The LCV regulates the flow of air from the APU

34
Q

What is the APU’s priority, pneumatic or electric?

A

The APU’s primary purpose is to provide electric power

35
Q

What manages bleed air distribution, and the air-conditioning system?

A

Two air conditioning system controllers (ACSC 1 & 2)

36
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

37
Q

What emergency situation requires the RAM-AIR Switchlight to be pressed?

A

When emergency ventilation of the cabin is required

38
Q

Where does ram air come from?

A

A scoop at the base of the vertical stabilizer

39
Q

What is the water extracted from the pack used for?

A

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

40
Q

When does the CABIN PRESSURE aural warning sound?

A

If cabin alt. exceeds 10,000 feet or the pressure differential exceeds 8.7psi

41
Q

Which hydraulic systems are cooled by ram air?

A

Systems 1 & 2

42
Q

How many recirculation fans are there?

A

One switch but two fans

43
Q

How are the cockpit avionics and displays cooled?

A

They’re cooled by dedicated cooling fans

44
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

45
Q

What does the amber CABIN ALT caution message indicate?

A

Cabin altitude is between 8,500 - 10,000 feet

46
Q

Generally describe the journey of air from outside the airplane, through the airplane, and back outside

A

Air first enters the engine. Then it is ducted to the packs as hot bleed air. From the packs it enters the cabin as conditioned air. From the cabin it would exit outside through the outflow valve.

47
Q

What is the function fo the Pressure Regulating Shutoff Valves (PRSOVs)

A

The PRSOVs modulate as commanded by the Air Conditioning System Controllers (ACSC) to maintain approximately 45 psi plus or minus3 in the bleed air manifolds

48
Q

Briefly describe the fundamentals behind an Air Cycle Machine (ACM)

A

An air cycle machine cycles hot air into cold air. This is accomplished through compression and expansion. Air is compressed inside the ACM causing its temperature to rise. The air is then cooled via liquid cooled heat exchangers and allowed to rapidly expand out of the ACM. As the air rapidly expands, its temperature drops dramatically completing the cycle.

49
Q

What is the function of the pack’s Hot Air Shutoff Valve?

A

The Hot Air Shutoff Valve opens at higher altitudes to supplement the pre-cooled air provided to the pack’s Flow Control Valve

50
Q

Describe the flow of air through the PACK components

A 
Please - Precooler
Hand - Heat Exchanger (Primary)
Charlie - Compressor
His - Heat Exchanger (Secondary)
Red - Re-heater
Coat - Condenser
With - Water Extractor
Tails - Turbine (Expansion Turbine)

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