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CRJ 900 > Environmental System > Flashcards

Environmental System Flashcards

1
Q

Which system provides conditioned air to the flight deck and passenger cabin?

A

The environmental control system (ECS) does, via two air conditioning units (PACKs)

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2
Q

What’s an ACSC?

A

It’s an “air conditioning system controller”

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3
Q

How many air conditioning system controllers (ACSC’s) do we have

A

2

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4
Q

Are the ASCS’s dual channel?

A

Yes, an A and B channel.

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5
Q

How often do the ACSC channels switch?

A

Daily

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6
Q

Is there any indication of which ACSC channel is active?

A

No

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7
Q

What do the ACSC’s do?

A

They regulate the aircrafts pressure (by operating the HPV and engine bleed valves) and temperature (controls the output temperature of the packs)

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8
Q

What does PACK stand for?

A

Pneumatic air conditioning kit

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9
Q

How many PACK’s do we have?

A

2

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10
Q

Where are the PACK’s located?

A

In the aft equipment bay

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11
Q

Which pack usually supplies air to the passenger cabin?

A

Right pack

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12
Q

Which pack usually sends air the flight deck?

A

The left PACK

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13
Q

What controls airflow through the packs?

A

The flow control valves (pack valves)

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14
Q

Will the pack valves automatically close when an engine start button is pushed?

A

Yes. After starter cutout, the pack valves will go the their previous position.

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15
Q

Which valve is modulated to adjust the temperature of the air?

A

The temperature control valve

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16
Q

What is used to cool the bleed air that’s sent to the cabin?

A

Three heat exchangers (pre-cooler, primary heat exchanger, and secondary heat exchanger) and an air cycle machine

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17
Q

What’s the flow of air through the PACK’s?

A

From the bleed air manifold —> pre-cooler —> flow control valve —> either the primary heat exchanger or the temperature control valve —> from the primary heat exchanger to the —> air cycle machine —> secondary heat exchanger —> reheated —> ACM —> mixed with metered, warm air from the temperature control valve —> condenser (removes excess water) —> fuselage

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18
Q

Where does conditioned air enter the cabin?

A

Ceiling, sidewalls, and gaspers

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19
Q

How is cabin air exhausted?

A

At the floor level

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20
Q

Is there another way for the galley to recieve heat?

A

There’s supplementary galley heat provided at the galley control panel

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21
Q

What is the backup cooling for the EICAS and EFIS displays?

A

The conditioned air from the left PACK

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22
Q

Is cabin air recycled?

A

Yes

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23
Q

Is galley or lavatory air recycled?

A

No, it’s exhausted

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24
Q

What aids in recirculating air throughout the cabin?

A

Dedicated, left and right, recirculation ducts and fans

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25
Q

What does the RECIRC toggle switch do?

A

In the ON position it allows air throughout the cabin to be recirculated

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26
Q

What controls the mixing of hot and cold air?

A

ACSC (air conditioning system controller)

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27
Q

Where can we see the cockpit and cabin air temperature?

A

ECS synoptic page

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28
Q

Apart from the ECS synoptic page, can the cabin temperature be seen anywhere else?

A

EICAS status page

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29
Q

How is the temperature usually controlled?

A

Automatically by setting the CKPT and CABIN temperature knobs to the desired temperature

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30
Q

How do you manually control the aircraft temperature?

A

Selecting MAN on the AC overhead panel. Temperature increase or decrease can be achieved by adjusting the hot/cold toggle switch. This will not display a selected temperature. You can try and achieve a particular temperature by watching the PACK discharge temperature vis the ECS synoptic page.

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31
Q

In manual mode, when will you get a L(R) PACK message?

A

When the discharge temperature is <= 5ºC or >=85ºC

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32
Q

What will happen if you have an overtemperature in auto mode?

A

The ACSC automatically closes the PACK valve, the pack shuts down, a L(R) PACK TEMP message will be displayed, and FAULT will illuminate on the L(R) air conditioning pack switchlight.

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33
Q

What the highest you can fly single PACK?

A

FL310

34
Q

What does it indicate if FAULT is illuminated on the left or right air-conditioning pack switchlights?

A

Pack overtemperature or over-pressure condition exists. The pack valves close automatically and must be manually reset per the QRH.

35
Q

What does the RAM air SOV do?

A

Supplies RAM air to the right side of the mixing manifold

36
Q

What does the RAM-AIR guarded switchlight do?

A

Allows RAM air to circulate in the cabin. Used when the aircraft is unpressurized. This is limited to 15,000’.

37
Q

What happens to the aft cargo bay if the aircrafts RECIRC overhead switch is turned off and the CARGO switch is selected to COND AIR?

A

Cool, un-recirculated air is sent to the aft cargo bay from the mixing manifold

38
Q

What does OFF do when selected on the CARGO switch?

A

Intake SOV and Exhaust SOV are closed

39
Q

What does the CARGO switch do the the AIR position?

A

Allows recirculated air (or conditioned air if the RECIRC switch is off or the RECIRC fan has failed) to flow through the aft cargo bay

40
Q

What happens when the CARGO switch is set to COND AIR?

A

Automatically provides temperature control to the aft cargo bay via an electric heater

41
Q

How many smoke detectors are in the forward cargo bay?

A

3

42
Q

How many smoke detectors are in the aft cargo bay?

A

2

43
Q

How are the display screens cooled?

A

Via fans that draw cool air from the flight compartment

44
Q

What methods of cooling are available for the EIFS and EICAS CRT’s?

A

A ground fan, flight fan, and standby mode

45
Q

What does the ground fan do?

A

Primary source of CRT cooling on the ground

46
Q

What does the flight fan do?

A

Primary source of CRT cooling in the air?

47
Q

What happens if both the ground and flight fans fail?

A

Conditioned flight deck air is used to ventilate the displays

48
Q

What do the exhaust fans do?

A

Used to evacuate air from the avionics bay, and CRT display exhaust duct.

49
Q

What does the ground valve do?

A

It ensures the aircraft is depressurized on the ground, improves the effectiveness of avionics cooling, and can help depressurization the aircraft on the ground.

50
Q

When is the ground valve open?

A

It opens after touchdown. It closes again when the galley and passenger doors are closed. It can be opened on the ground when the EMERGENCY DEPRESURIZATION button is pushed.

51
Q

What message is displayed if the ground valve fails to close?

A

OVBD COOL

52
Q

What message is displayed if the ground valve fails to open?

A

OVBD COOL FAIL

53
Q

How quickly does the ground valve open, on the ground, when the EMER DEPRESS button is pushed?

A

At full speed (approximately 2 seconds)

54
Q

What controls the aircrafts pressurization?

A

Two cabin pressure controllers (CPC’s)

55
Q

Ho is the cabin pressure regulated?

A

By modulating the outflow valve

56
Q

How many motors does the outflow valve have?

A

3 electric motors

57
Q

When do the cabin pressure controls (CPC’s) switch?

A

With weight on wheels (WOW) plus 3 minutes

58
Q

Is there a way to manually switch the cabin pressure controllers?

A

Yes. By pressing the PRESS CONTROL switch twice.

59
Q

What happens when you select the EMER DEPRESS switch in flight?

A

The outflow valve will open to depressurize the aircraft but it won’t depressurize to less than 14,500’+/-500’

60
Q

How many safety valves do we have and what do they do?

A

There are two pneumatically operated safety valves which prevent overpressure and negative pressure conditions.

61
Q

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

A
  • Automatically deploys the passenger oxygen masks at 14,000’ cabin pressure altitude.
  • Limits cabin altitude to 14,500’ +/- 500’
  • Controls the opening of the ground valve to avoid disturbance of the outflow valve.
62
Q

Whats normal cabin differential pressure?

A

8.5psi

63
Q

What’s the maximum relief differential cabin pressure?

A

8.7psi

64
Q

What’s the maximum negative pressure?

A

-0.5psi

65
Q

What’s the maximum differential pressure during taxi, takeoff, and landing?

A

0.1psi

66
Q

What does ground mode do?

A
  • drives outflow valve fully open for maximum ventilation

- closes when passenger and service doors are closed

67
Q

What does pre-pressurization mode do?

A
  • Activated on the ground when thrust levers are advanced for takeoff.
  • Cabin is pressurized to 150’ below actual field elevation
  • For a no bleed takeoff the outflow and ground valves are closed.
68
Q

What does takeoff abort mode do?

A
  • Altitude is drive back to field elevation at 500fpm for 20 seconds, then the outflow valve remains fully open. Returns to ground mode.
  • Activates when thrust levers are retarded for an aborted takeoff
69
Q

What does flight abort mode do?

A

-Retains pre-pressurization altitude for the first 10 minutes of flight in event of a return to the field.

70
Q

What does climb mode do?

A
  • Increases cabin pressure altitude, usually at 300-500fpm

- programmed according to the landing field elevation.

71
Q

What does cruise mode do?

A

-Every cruise altitude has an assigned cabin pressure altitude that the aircraft will try and maintain

72
Q

What does descent mode do?

A
  • Increases the cabin pressure altitude, typically by about 300fpm, by restricting to the outflow valve.
  • The rate is directly related to the aircrafts rate of descent
73
Q

What does landing mode do?

A
  • after touchdown the cabin pressure altitude is increased to landing elevation. Outflow and ground valve will be completely open.
  • Entered when the active controller (CPC) receives the WOW signal and at least on thrust lever is at idle.
74
Q

When will FAULT illuminate on the PRESS CONTROL switchlight?

A

When both CPC’s have failed

75
Q

What happens when you select the PRESS CONTROL switchlight?

A

Will change the pressurization to manual mode and MAN will illuminate

76
Q

What’s the manual pressurization procedure?

A
  • Select UP or DOWN on the MAN ALT toggle switch to decrease or increase the cabin pressure altitude respectively. The rate can then be controlled by MAN rate switch.
  • To hold your current pressure altitude select HOLD on the MAN ALT toggle switch
77
Q

When will you get a cabin altitude caution message?

A

Cabin altitude above 8,500’

78
Q

When will you get a cabin altitude warning message?

A

Above 10,000’. Additionally a voice can be heard saying, “CABIN PRESSURE”

79
Q

How often is the pressurization system tested?

A

It’s continually tested throughout the flight

80
Q

EPC memory checklists related to pressurization

A

RAPID DECOMPRESSION checklist items and CABIN ALT OR EMERGENCY DESCENT checklist memory items

CRJ 900 (23 decks)

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