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GoJet Study Guide 24 July 18 > Air conditioning and pressurization > Flashcards

Air conditioning and pressurization Flashcards

1
Q

What bleed air systems can be used to supply the air conditioning packs?

A

External air, APU air or bleed air from the engines, depending on the situation.

left engine usually supplies left pack and vice versa

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2
Q

What is the maximum altitude for single A/C pack operation?

A

CRJ700 FL 310

CRJ900 FL250

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3
Q

What switch position allows conditioned air to cool the flight deck CRT displays

A

STDBY on the DISPLAY/AVIONICS fan control panel.

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4
Q

How are the avionics cooled?

A

Ambient underfloor air or by the avionics exhaust fan.

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5
Q

What happens if the CPC microprocessor fails?

A

The oxygen masks will not drop automatically and the Seatbelt and No Smoking signs will not illuminate.

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6
Q

If the cabin altitude reaches 14,000 feet, what will the CPAM do?

A

Trigger the oxygen system auto deploy and present the masks to the passengers

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7
Q

The “CABIN PRESSURE” aural warning will be heard when ______________________.

A

Cabin altitude exceeds 10,000 feet or the differential pressure exceeds 8.7 psid.

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8
Q

What does the flight abort mode of the pressurization system do?

A

Holds the departure airport elevation setting for 10 minutes after takeoff or 6000 feet above takeoff field elevation

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9
Q

Where does the air from the engines used for pneumatics come from?

A

From the 6th and 10th stage bleed sections of the N2 compressor.

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10
Q

What is the purpose of the check valve on the 6th stage bleed line?

A

Prevents back flow of 10th stage air into the engine when the High Pressure Bleed Valve (HPV) is open.

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11
Q

When does bleed air switching occur during landing

A

Flaps are greater than 20 degrees or the landing gear is down.

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12
Q

With the bleed valve control in the manual mode, it is possible to provide APU air to the Wing Ice protection system.

A

False–Wing bleed valves will close and BLEED MISCONFIG message will appear on EICAS..

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13
Q

What happens to the water extracted from the conditioned air produced by the A/C packs?

A

It is ducted back into the ram air flow to help cool the heat exchangers.

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14
Q

On the ground, air exhausted from the cooling displays and the avionics area exits the aircraft through________________.

A

The ground valve and is vented overboard through the bulkhead.

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15
Q

Two safety valves in the aft bulkhead serve to___________.

A

Protect against both over pressurization and negative pressure

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16
Q

If the automatic temperature control feature of an A/C pack malfunctions, what can the pilot do?

A

Select the MAN switchlight for that pack and control the temperature control valve with the HOT/COLD toggle switch.

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17
Q

How is the galley air heated?

A

By a 1000 watt electric heater, controlled by the HEATER switchlight at the galley control panel

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18
Q

What is the maximum positive and negative pressure differential?

A

Positive–8.7 psid

Negative -0.5 psid

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19
Q

What will happen if the active cabin pressure controller fails?

A

The standby controller will automatically take over control.

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20
Q

The EMER DEPRESS switch light will allow the outflow to open and the cabin will rise to ____________. It should not be selected at altitudes above __________.

A

14,500 feet/15,000 feet

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21
Q

How would select the other auto pressure controller in flight? How would you select the Manual controller?

A

Press the PRESS CONT switchlight twice to change active controllers. Press it once to select the manual controller.

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22
Q

What does an illuminated FAULT light on the CABIN PRESS panel indicate and what would you do?

A

Failure of both automatic pressure controllers has occurred. Pilot should take over with MAN control per the QRH.

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23
Q

A red CABIN ALT message indicates that the cabin altitude exceeds ____feet. An amber CABIN ALT message indicates the cabin altitude is____________________.

A

10,000/between 8,500 and 10,000 feet.

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24
Q

Cooling air for the air conditioning heat exchangers is provide by_________________.

A

the Ram Air Scoop

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25
Q

What is 10th stage bleed air used for?

A

Augment the bleed air supply when the 6th stage cannot meet demands

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26
Q

L/R PACK Switchlights

Pushed out?
Pushed in?
What does the amber fault light mean?

A

the pack flow control valve closes and the white OFF light illuminates

The pack flow control valve opens and the white OFF light extinguishes

FAULT means the pack has failed in both auto and manual mode due to an over temperature or over pressure condition

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27
Q

RECIRC FAN switch

A

turns both re-circulation fans on and off

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28
Q

RAM-AIR guarded switchlight

A

WHEN pushed in:

The ram air valve will open and the white OPEN light illuminates along with a white status message on ED2 w

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29
Q

CKPT MAN and CABIN MAN mode switchlights

When pushed in?
When pushed out?

A

Control of temperature control valve is given to the spring loaded manual toggle switches and the switchlight illuminates white.

Pressing again (switch out) will place the associated temperature control valve back in auto

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30
Q

HOT - COLD switches

A

during manual temperature control mode, these switches drive the temperature control valve toward the desired temperature, hot or cold, depending on where the switch is held.

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31
Q

MAN RATE selector?

A

electrically adjusts the position of the outflow valve to control rate of change.

32
Q

PRESS CONTROL switchlight

What happens pushed once?
Pushed twice?
What does AMBER fault light mean?

A

Selects manual mode and the MAN light illuminates. The CPAM will provide cabin pressure data on ED1

The Standby cabin pressure controller is activated

It illuminates if both cabin pressure controllers fail

33
Q

EMER DEPRESS switchlight

A

When pressed:
The outflow valve will fully open until the cabin reaches 14,500 plus or minus 500ft and the EMER DEPRESS caution message will illuminate.

34
Q

how is bleed air from both engines kept separate?

A

the isolation valve

35
Q

Can left engine provide bleed air to the right pack?

A

yes. by selection the ISOL switch to OPEN the BLEED SOURCE rotary selection the L ENG and then placing bleed valves in manual

36
Q

How is the ISOL switch normally positioned?

A

CLSD

37
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

38
Q

How many automatic Cabin Pressure Controllers are there and why?

A

Two, one is active and the other is in standby ready to take command if the active controller fails

39
Q

what does the CPAM do?

A

First it acquires cabin pressure and rate of change information for display on EICAS. In the event both CPC’s fail, this infomration will let the crew know how they should manually operated 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 14000 ft

40
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 for desired cabin altitude. To increase the rate of change slowly move the MAN RATE knob toward the increase position.

41
Q

How many outflow valves are there?

A

One

42
Q

How is the outflow valve powered?

A

electrically by 3 separate motors

43
Q

what commands the 3 outflow valve motors?

A

Motor 1 CPC1
Motor 2 CPC2
Motor 3 Manually controlled by the pilot with the MAN RATE and MAN ALT knobs

44
Q

during automatic mode when the CPC’s are in control how many operational phases are there?

A

seven

45
Q

Name the CPC’s operational phases

A

ground phase, takeoff phase, flight abort phase, climb/cruise phase, decent phase, landing phase and touch and go phase.

46
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 6000 feet or 10 minutes passes

47
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 15000ft

48
Q

when will the cabin altitude aural warning sound?

A

at a differentail pressure of 8.7

49
Q

will the cabin fully decompress at 41000ft?

A

no the cabin will depressurize up to a cabin altitude of 14,500 feet plus or minus 500

50
Q

what does the ground valve do?

A

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

51
Q

when does the ground valve open and close?

A

the ground vale closes when the main cabin door is closed prior to departure and opens after landing with weight on wheels

52
Q

what does the OBVD COOL FAIL stats message mean?

A

the ground valve failed to open after landing

53
Q

What does the PACK acronym stand for?

A

Pneumatic-Air conditioning kit

54
Q

Which pack provides cooling to the cockpit/cabin?

A

normally left to cockpit and right to cabin

55
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 packs air to both the cockpit and cabin

56
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 desired direction

57
Q

what protects the airplane from overpressure or negative pressure situations?

A

two safety valves one for overpressure and one for negative pressure

58
Q

when engine stages can bleed air be extracted from

A

6th stage normal ops 10th stage high demand situations

59
Q

can air be taken from 6th and 10th stage simultaneously?

A

no there is a one way check valve

60
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 degrees or less

61
Q

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

A

with the gear or flaps extend to 20 or greater, with thrust out of TOGA

62
Q

Describe the function of the Load Control Valve

A

the LVC regulates the flow of air from the APU

63
Q

is APU priority pneumatic or electric?

A

electric power

64
Q

what manages bleed air distribution and the air conditioning system?

A

Two air conditioning system controllers ACSC1 and 2

65
Q

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

A

No however a digital air pressure readout will indicated external air is being provided

66
Q

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

A

When an emergency ventilation of the cabin is required

67
Q

where does ram air come from?

A

a scoop at the base of the vertical stabilizer

68
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

69
Q

Which hydraulic systems are cooled by ram air?

A

systems 1 and 2

70
Q

how many recirculation fans are there?

A

one switch two fans

71
Q

how are the cockpit and avionics displays cooled

A

theyre cooled by dedicated cooling fans

72
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

73
Q

What does the amber CABIN ALT caution message indicate?

A

cabin altitude is between 8500- 10000 ft

74
Q

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.

75
Q

what is the function of the Pressure Regulating shutoff Valves?

A

the PRSOVs modulate as commanded by the air conditioning system controllers (ACSC) to maintain approximately 45 psi plus or minus 3 in the bleed air manifolds

76
Q

What is the function of the packs Hot Air Shutoff Valve?

A

The hot air shutoff Valve opens at higher altitudes to supplement the pre cooled air provided to the packs flow control valves.

77
Q

describe the flow of air through the PACKS 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 tube)

GoJet Study Guide 24 July 18 (26 decks)

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