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CRJStudy -700 > ECS > Flashcards

ECS 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 seperate?

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 MANUEL.

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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 Controlelr do?

A

It independantly 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 and no smoking signs to illuminate if the cabin altitude exceeds 14,000 feet.

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8
Q

Describe how to manually control cabin pressure.

A

Push the PRESS CONTROL switchlight, 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 by three seperate electric motors.

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11
Q

What commands the three outflow valve motors?

A
  1. CPC 1
  2. CPC 2
  3. Manually controlled by the pilot with the MAN RATE & MAN ALT knobs.
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12
Q

During automatic mode with the CPCs are in control, how many operational phases are there, and name them.

A

Seven. Ground, Takeoff, Flight Abort, Climb/Cruise, Descent, Landing, and Tounch and Go.

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13
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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14
Q

What is the EMER DEPRESS button used for?

A

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

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15
Q

When will the cabin altitude aural warning sound?

A

At a differential pressure of 8.7

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16
Q

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

A

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

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17
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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18
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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19
Q

What does the OVBD COOL FAIL status message indicate?

A

The ground valve failed to open after landing.

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20
Q

What does the “PACK” acronym stand for?

A

Pneumatic Air-Conditioning Kit

21
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.

22
Q

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

A

Yes. Both packsprovide air to the mixing manifold under the aft cargo. Internal baffling in the mixing chamber will aloow either pack’s air to both the cockpit and cabin.

23
Q

How is the cabin temperature manually adjusted?

A

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

24
Q

Can the aircraft be flown with one pack inoperative?

A

Yes, but the flight is limited to FL310.

25
Q

What is the maximum cabin differential pressure?

A

+8.7 PSI, -0.5 PSI, .1 PSI during taxi.

26
Q

What protects the airplane from overpressure or negative pressure situations?

A

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

27
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).

28
Q

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

A

No, there is a one way check valve.

29
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 deg or less.

30
Q

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

A

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

31
Q
A
32
Q

Describe the function of the Load Control Valve.

A

the LCV regulates the flow of air from the APU.

33
Q

What is the APU’s priority, pneumatic or electric

A

Electric.

34
Q

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

A

Two air-conditioning system controllers (ACSC 1 & 2)

35
Q

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

A

No, however a digital air pressure readout will indiacte external air is being provided.

36
Q

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

A

When emergency ventilation of the cabin is required.

37
Q

Where does ram air come from?

A

A scoop at the base of the vertical stabilizer.

38
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.

39
Q

When does the CABIN PRESSURE aural warning sound?

A

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

40
Q

Which hydraulic systems are cooled by ram air?

A

Systems 1 & 2.

41
Q

How many recirculation fans are there?

A

One switch, but two fans.

42
Q

How are the cockpit avionics and displays cooled?

A

They’re cooled by dedicated cooling fans.

43
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.

44
Q

What does the amber CABIN ALT caution message mean?

A

Cabin altitude is between 8,500 and 10,000 feet.

45
Q

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

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 throught he outflow valve.

46
Q

What is the function of the Pressure Regulating Shutoff Valve? (PRSOV)

A

The PRSOVs modulate as commanded by the Air Conditioniing System Controllers (ACSC) to maintain approximately 45 PSI plus or minus 3 in the bleed air manifolds.

47
Q

Briefly describe the fundamentals behind an air cycle machine.

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.

48
Q

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

A

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

CRJStudy -700 (16 decks)

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