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Part 121 - CRJ 701/900 > Air Conditioning and Ventilation > Flashcards

Air Conditioning and Ventilation Flashcards

1
Q

On the ground, how can pneumatic air be supplied to the aircraft?

A

High pressure ground source

APU

Either or both engines

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2
Q

What are the different components of a pack?

A
  1. Dual heat exchanger
  2. Condenser
  3. Air cycle machine
  4. Reheater
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3
Q

What is indicated when “HI TEMP” is displayed on the ECS synoptic page?

A

Temperature has exceeded a predetermined limit or sensed other internal faults and the pack has automatically shut down

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4
Q

Which pack supplies most of the air to the flight deck?

A

The left pack

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5
Q

When will a “RECIRC FAN FAULT” status message be displayed?

A

When either fan speed decreases below 60% of normal speed or…

An overheat has occurred

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6
Q

Describe the flow of air through a Pack.

A

Bleed air is directed to HEAT EXCANGER, then to the COMPRESSOR of the ACM, through a DUAL HEAT EXCHANGER, REHEATER and CONDENSER, ACM turbine, then REHEATER, then to Air manifold.

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7
Q

Where are the PACKs located?

A

In aft equipment compartment

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8
Q

“HI TEMP” on synoptic page over a pack means what?

A

High temperature is sensed.

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9
Q

What will cause a pack SWITCHLIGHT to indicate OFF automatically?

A

If temperature exceeds limits or other certain internal faults are detected. This will cause the pack to automatically shut down.

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10
Q

“AUTOFAIL” displayed on ECS synoptic page means what?

A

A failure of the pack has occurred in automatic mode

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11
Q

What cools the L and R dual heat exchangers?

A

Ram air.

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12
Q

Where is the RAM air inlet and outlet?

A

INLET: Ram air scoop bottom forward leading edge of vertical stabilizer.

OUTLET: exhaust duct lower aft fuselage

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13
Q

If both packs fail, what will happen?

A

RAM AIR VALVE can allow ram air to enter mixing manifold where it is supplied to PAX and FLT compartments.

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14
Q

If “RAM AIR OPEN” status message appears, what does this mean?

A

The RAM AIR VALVE is open.

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15
Q

If the RAM AIR valve does not reach the commanded position, how will you know?

A

The ECS synoptic page will show the RAM AIR VALVE as being purple

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16
Q

How do you open the RAM AIR VALVE?

A

Hitting the guarded RAM-AIR Switchlight.

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17
Q

What is the purpose of the mixing manifold?

A

Where both packs and recirculated air are routed to be distributed to the compartments.

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18
Q

Which compartment does the left pack primarily influence? The right?

A

LEFT: flight
RIGHT: passenger

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19
Q

If a pack fails, can the other supply AC air for the whole airplane?

A

Yup

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20
Q

How is temperature controlled?

A

Modulation of the temperature control valve?

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21
Q

What does the temperature control valve do?

A

It allows bleed air to bypass dual heat exchanger and ACM and allows mix of hot and cold air to correct for whatever temperature is selected.

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22
Q

How is position of the temperature control valve changed?

A

AUTOMATICALLY: through the ACSC to maintain selected temperature.

MANUALLY: through temperature control toggle switch when MAN switch light is pressed.

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23
Q

What is the normal temperature operating range of the AC system?

A

5-85 degrees Celsius.

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24
Q

What should manual mode not be used for?

A

To rapidly reduce flight deck or cabin temps.

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25
Q

How many recirculation fans are installed and their purpose?

A

2, they improve system efficiency by returning cabin air to mixing unit and combining it with fresh pack air

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26
Q

How are the recirculation fans controlled?

A

Through a single switch “RECIRC FAN”

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27
Q

Which fan supplies the aft cargo compartment for ventilation and heating?

A

RECIRC FAN 1

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28
Q

How is AC air exhausted out of the Flight and PAX compartment?

A

Under the floor to the outflow valve.

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29
Q

How can we check supply duct temperature?

A

the ECS synoptic page.

30
Q

Where is the low pressure ground air connection?

A

Right aft fuselage.

31
Q

Where does the ventilation system provide ventilation for?

A
  1. Lavatories
  2. Galleries
  3. Avionics
  4. Aft cargo compartment
32
Q

What panels control the ventilation system?

A

FA galley control panel
Avionics cooling panel
Air-conditioning panel

33
Q

What BUS are the lavatory fans on? The galley?

A

AC BUS 1 = LAVs

AC BUS 2 = GALLEY

34
Q

What is the cockpit indication if a galley or lav fan fails?

A

There are not cockpit indications of these fan operations

35
Q

How are the recirculation fans monitored for an over heat?

A

Overheat switch, which will automatically shut down the fan in the event of a motor overheat.

36
Q

How is the galley heater controlled?

A

A Switchlight on the galley control panel

37
Q

What will render the galley heater inoperative?

A

If the R PACK Switchlight on the AIR CONDITIONING panel is selected OFF.

38
Q

What protects the galley heater from overheat and what is the flightdeck indication of an overheat?

A

Internal thermal protection and 3 internal thermal fuses in case of thermal protection failure. No flightdeck indication

39
Q

How is heated air dumped overboard on the ground?

A

Through the ground outflow valve

40
Q

How is heated air dumped overboard in the air?

A

Through pressurization outflow valve

41
Q

What systems are cooled in flight and on the ground:

A
  1. Electronic flight instruments
  2. Control panels and display units in center pedestal
  3. EICAS display unit is in the center instrument panel
  4. Electronic units in the left and right portion of the avionics bay.
42
Q

How are the flight deck displays cooled?

A

From two display fans in the avionics bay.

43
Q

How do the display fans operate?

A

1 at a time. On the ground, display fan 2 operates. In flight, display fan 1 operates.

44
Q

Where do the display fans get their air from?

A

Takes air from the flight compartment and mixes it with air from the mixing manifold

45
Q

What monitors airflow to the displays?

A

A low flow sensor. Ensures adequate cooling

46
Q

If 1 fan fails, what are your options?

A

You can use the DSPLY FAN selector knob on the AVIONICS COOLING panel to control fans.

47
Q

Selecting GND ALT on the DSPLY FAN selector knob will do what?

A

Select fan 1 as an alternate fan when on the ground

48
Q

What will selecting FLT ALTN on the DSPLY fan selector knob do?

A

Select Fan 2 as an alternate fan in flight.

49
Q

Where are the avionics exhaust fans and what’s their purpose?

A

Under the flight compartment. They remove hot air from the avionics equipment

50
Q

What is the difference between the DSPLY FAN and the AVIONICS FAN?

A

Display fans push cool air towards the avionics while the avionics fans push the hot air away from the avionics.

51
Q

What are the normal avionic fan operations?

A

Avionics 1 = flight

Avionics 2 = ground

52
Q

Selecting GND ALTN position of the AVIONICS FAN selector knob on the Avionics Cooling Control panel does what?

A

Selects Avionics Fan 1 as an alternate on the ground.

53
Q

What does setting STBY on the Fan Control knob do?

A

Permits conditioned air to ventilate displays.

54
Q

OVBD COOL FAIL means what?

A

If the overboard exhaust SOV has failed closed on the ground with passenger door unlatched

55
Q

OVBD COOL caution will display when?

A

When the overboard exhaust SOV is not closed with the passenger and service doors closed

56
Q

What could happen if the overboard exhaust SOV has failed open?

A

The aircraft will not pressurize normally.

57
Q

When will the DISPLAY COOL caution appear?

A

If low airflow is sensed in cockpit display cooling duct or fan failure.

58
Q

When will AVIONICS FAN caution be displayed?

A

If low airflow in the exhaust duct is sensed or an avionics fan has failed.

59
Q

When will DISPLAY TEMP be displayed?

A

Impending thermal shutdown of the respective display.

60
Q

In an impending thermal shutdown of the PFD, what will happen?

A

The Sky and ground will be removed in order to delay the thermal shutdown

61
Q

The heater for the aft cargo compartment will automatically cycle on and off as needed to maintain the compartment temperature between ___________.

A

16 and 27 degrees Celsius

62
Q

Where does the cargo compartment get it’s air from?

A

RECIRC fan 1

63
Q

Where is the aft cargo compartment air exhausted?

A

Exhaust shutoff valve and ducted under floor to outflow valve.

64
Q

If RECIRC fan 1 fails, what will happen to the air supplied to the cargo compartment?

A

It will still by supplied by conditioned air from mixing manifold.

65
Q

How the the aft cargo compartment air controlled?

A

3 position switch on A.C panel in flight deck.

66
Q

Describe each of the positions of the AFT CARGO compartment switch on the AC panel:

A
  1. OFF: both the inlet and exhaust shutoff valve will be closed
  2. AIR: both shut off valves to the aft cargo compartment are opened, but the heater is not turned on.
  3. COND AIR: both shut off valves are opened, and the heater engages to maintain 16-27 Celsius in the aft cargo compartment.
67
Q

How is the aft cargo heater controlled?

A

Automatically through ACSC 2 (Air Conditioning System Controller)

68
Q

If ACSC 2 senses the aft cargo inlet air shutoff valve has failed, what ill happen?

A

“AFT CARGO SOV” status message.

69
Q

What does “AFT CARGO OVHT” caution mean?

A

ACSC 2 detected 40 Celsius or more in the aft cargo compartment.

70
Q

If fire or smoke is detected in the aft cargo compartment, what will happen?

A

Both the inlet and exhaust shutoff valves will close in order to isolate the aft cargo compartment.

Part 121 - CRJ 701/900 (25 decks)

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