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AWAC Flash Study > Pressurization and Air Conditioning > Flashcards

Pressurization and Air Conditioning Flashcards

1
Q

How many caban pressurization modes does the CRJ-200 have?

A

8

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2
Q

Ground Mode

A

Both outflow valves open.

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3
Q

PRE-PRESSURE MODE:

A

When thrust levers are advanced the cabin goes to -150 AGL at 300 FPM.

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4
Q

TAKE OFF ABORT MODE:

A

FTM VOL 2 Air Conditioning and Pressurization

  1. When thrust levers retarded to idle the cabin climbs at 500 FPM for 20 sec then returns to ground mode.
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5
Q

CLIMB MODE

A

FTM VOL 2 Air Conditioning and Pressurization Page 34

  1. Cabin climbs at 500fpm
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6
Q

FLIGHT ABORT MODE

A

FTM VOL 2 Air Conditioning and Pressurization Page 34

  1. This mode is armed whe the cabin is at less then 6000 feet AGL for 10 min after weight off wheels. When a 1,000 FPM decent is initiated the cabin preselect is reset to the departure field elevation.
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7
Q

CRUISE MODE

A

FTM VOL 2 Air Conditioning and Pressurization Page 34

  1. When airplane altitude is maintained (+ 200 feet) for 10 minutes, a descent schedule occurs. When descent is initiated, the cabin descends at 300 FPM.
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8
Q

LANDING MODE

A

Cabin altitude is driven below field elevation. When cabin is below landing elevation, the cabin will climb at 500 FPM for 60 seconds then the outflow valves are driven full open.

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9
Q

TOUCH AND GO MODE

A

FTM VOL 2 Air Conditioning and Pressurization Page 34

  1. On touchdown, the system assumes landing mode; when thrust levers advance it goes into pre-pressure mode.
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10
Q

How many Pack does the CL-65 have?

A

2

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11
Q

What does pressing the EMER DEPRESS switch light do?

A

FTM VOL 2 Air Conditioning and Pressurization Page 33​

  1. Commands both outflow valves to full open
  2. The altitude limiters will attempt to prevent the cabin from climbing above 14,250 + 750 feet
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12
Q

What does the Amber FAULT light on the PRESS CONTROL switch light mean?

A

The FAULT (amber) light illuminates when both pressure controllers have failed.

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13
Q

What does the MAN RATE knob do?

A

FTM VOL 2 Air Conditioning and Pressurization Page 33​

  1. The MAN RATE selector range is from 50 - 3,000 + 1,000 FPM and will be displayed on the ECS Synoptic page.
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14
Q

The outflow valves are electrically controlled and
slaved through a pneumatic line. How are they operated in Auto Mode?

What about Manual mode?

A

FTM VOL 2 Air Conditioning and Pressurization Page 32

In Auto mode the left valve is the master,
• the right is slaved, and
• the valves respond to electric inputs.

In Manual Mode:
• the right valve is the master, and
• the valves respond to pneumatic inputs.

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15
Q

How many pressure controllers does the CRJ-200 have?

A

2

One is always in use while the other acts as a back up. If one fails it auto switches to the back up.

ADC 1 is the normal input and ADC 2 is the back up. If both pressure controllers fails they system goes into hold mode.

Controlers auto switch when on the ground after 3 min

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16
Q

What altitude due altitude limit controlers keep the cabin alt at?

A

Altitude limit controllers will close to limit cabin altitude to 14,250 + 750 feet.

17
Q

When will the CPAM trigger the passenger oxygen masks to auto deploy?

A

The Cabin Pressure Acquisition Module (CPAM) will trigger the passenger oxygen auto-deploy system when cabin altitude reaches 14,000 feet. The CPAM will also turn on the no smoking and fasten seatbelt signs at 10,000 feet cabin altitude, if the PAX signs are selected to auto.

18
Q

When do you get the CABIN ALT caution message?

CABIN ATL warning message?

A

CAUTION: Cabin Alt 8,500.
WARNING: Cabin Alt 10,000 or greater

19
Q

What stages of bleed air do we have have on the CRJ-200 and what do they do?

A
  • 7th Stage- Used for pressurizing some seals and gaskets.
  • 10th Stage- Used for engine starts, air conditioning, equipment cooling, and pressurization.
  • 14th Stage- Thrust reversers, wing and cowl anti-icing
20
Q

What sources do we have for 10th stage bleed air?

A

Normal is the 10 stage of the engine compressors but can also be supplied by the APU or a ground power cart.

21
Q

Why are the 10th Stsge bleed air valves interconnected?

A
  • This prevents the airflow from the engines back flowing THROUGH the APU LCV into the APU causing damage to the APU compressor
  • With Engines and APU running if the L/R 10th stage bleed is opened the APU LCV will close
22
Q

What purpose does the ISOL valve serve?

A
  • Isolated the left from the right side of the 10th stage bleed manifold.
  • Allows for crossover engine starts (known as Cross Bleed engine starts)
  • APU Engine starts
  • Ground air supply engine starts
  • Crossover air conditioning
23
Q

What kind of leak detection do we have for 10/14th stage bleed air?

A
  • Dual Loop for 10th Stage ( more than one source of bleed air more than one loop)
  • single Loop for 14th Stage. ( one source one loop)
24
Q

What does the DUCT MON loop A/B test do?

A

It tests the continuity of the individual 10th stage loops A and B to ensure they are not shorted to ground.

Note that if “1” of the loops had a short it can be placed on MEL. Not both.

25
Q

How is pack pressure and out put divided through out the CRJ-200?

A
  • Right Pack- 70% cabin and 30% to distribution manifold. Cabin exhaust air is routed under the floor boards to the out flow valves.
  • Left Pack -70% flight compartment and 30% to distribution manifold. Flight compartment exhaust air is routed through the avionics bay to the out flow valves.
26
Q

What pressure does the 10th stage system regulate the packs to?

Single pack OPPS?

A

30PSI for dual packs

41PSI for single pack

27
Q

The cargo fan supplies what kinda of air to the cargo compartment?

A

Re-circulated cabin exhaust air

Note- if the temperate exceeds 35^c the fan shuts down and a yellow caution message on ED2 is displayed.

28
Q

How are the Out Fow Valves operated?

A

Out Flow Valves are operated by a jet pump driven by the 10th Stage air.

  • Auto Mode- left valve is master and right is slave and both respond to electronic inputs.
  • Manual Mode- right is master and valves respond to pneumatic imputes.
29
Q

With the PAX signs in “AUTO”. When will the seatbelt and no smoking signs automatically turn on

A

CPAM will turn on the PAX signs at 10,000 feet if the switch is in auto.

30
Q

If the cabin depressurizes or if the PACKS are left off, at what cabin altitude will the oxogen masks auto deploy?

A

14,000 feet.

31
Q

What does the “FAULT” light illuminated on the cabin press panel mean?

A

It will illuminate only when both cabin pressure controllers have failed.

32
Q

What happens when the guarded EMER DEPRESS switch light is selected?

A

Both outflow valves open to depressurize the cabin. The altitude limiters will attemptn prevent the cabin from rising above 14,250 +- 750 feet.

33
Q

How does the MAN ALT switch work?

A

In the UP position it allows the outflow valves to open and cabin ALT to climb at the rate selected by the MAN RATE knob

In the DOWN position it allows the outflow valves to close and the cabin alt to descend at a rate selected by the MAN RATE knob.

The man rate knob range is 50-3,000 +/- 1,000 fpm.

34
Q

When do Presurization controlers switch?

A

Automaticly in flight if one fails

or

After 3 min after weight on wheels.

35
Q

When do we get a BLEED MISCONFIG caution messege

A
  1. When the Wing or Cowl anti-ice are selected ON
  2. 10th Stage SOV open
  3. Landing gear down or Flaps greater then 0
36
Q

What system cools our avionics

A

The cockpit avionics and avionics bay are coold by the conditioned air from the cockpit supplie or recirculated air from the cabin and cockpit.

37
Q

What is the split in the packs from cabin to cockpit

A

LEFT PACK

70% cockpit 30% cabin

RIGHT PACK

30%cockpit 70% cabin

38
Q

What does the FAULT light on the L or R pack switch light mean?

A

When the pack senses over presure of over temp. The pack will automaticly shut down and the FAULT light will tun on for the individual pack.

39
Q

What does the RAM AIR function do for the aircraft

A
  1. Cooles Hydraulic systems 1 & 2
  2. Provides pack heat exchanger cooling.
  3. Ventalates the cabin and cockpit during total presureazation failure.

AWAC Flash Study (10 decks)

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