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Crj 900 > Air Conditioning And Pressurization > Flashcards

Air Conditioning And Pressurization Flashcards

0
Q

What controls the ram air regulating valve(RAVR)

A

The air conditioning system controllers

ACSC’s

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1
Q

ACSC

A

Air conditioning system controllers

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2
Q

In the event of dual pack failure what provides air

A

Ram air switchlight

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3
Q

Using the ram air switch light the air enters which supply system

A

The left supply system

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4
Q

How many avionic cooling fans

A

Fan 1 … Operates during flight or on the ground as alternate

Fan2… Operates on the ground or in flight as alternate

Standby fan operates as backup

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5
Q

When smoke is detected in the cargo bay

A

The heater power is removed and the shut off valves automatically close

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6
Q

How many Galley heaters do we have

A

Two 500 W heaters to supply heat to the galley and Service door area

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7
Q

Cabin pressure is maintained and controlled by

A

1 electro pneumatic outflow valves

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8
Q

If cabin altitude exceeds 14,000 feet

A

Passenger oxygen masks deploy

3-13

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9
Q

The outflow valves are automatically controlled by

A

Either of two independent Cabin pressure controllers

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10
Q

How many CPC’s

A

2

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11
Q

The pressure controller automatically switches on the ground when

A

On the ground for three minutes

The active CPC is displayed on the ECS synoptic page

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12
Q

EMER DEPRESS

A

Opens bothoutflow valves

14500 +-500

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13
Q

FASTEN SEATBELT SIGN

and

NO SMOKING SIGN

comes on automatically when

A

Cabin altitude is at or above 8500 feet

Px sign in auto

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14
Q

Do we have a CPAM

A

No

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15
Q

Amber fault light on one of the packs?

A

Failed in both auto and manual

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16
Q

Amber fault lt on the PRESS CONT Switch?

A

Both cabin pressure controllers have failed

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17
Q

When is pressurization data shown on the primary page

A

When in manual mode

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18
Q

What cools packs

A

Ram air

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19
Q

Ram air also provides cooling airflow to

A

Cooling of number one and two hydraulic system fluids

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20
Q

How many recirc fans

A

2

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21
Q

Test question

Low-pressure compressed air from a ground air conditioning cart can be supplied directly to

A

Into the flight and passenger compartment distribution systems

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22
Q

What are the two avionics exhaust fans used for

A

To extract the heated air from behind the flight compartment displays and from the avionics equipment

On the ground the heated air is dumped overboard through the ground outflow valve

Inflight the heated air is ducted to the pressurization outflow valve and dumped overboard

8-30-1 mes psm

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23
Q

OVBD COOL FAIL status?

A

“Overboard exhaust shutoff valve Has failed closed with the aircraft on the ground and the passenger door unlatched” QRH definition

  • Ground valve fails to open after touchdown— SYS 3-24
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24
Q

OVBD COOL caution

A

Over board exhaust shutoff valve is not closed with the passenger door and service door closed

Aircraft will not pressurize

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25
Q

How many electrically controlled outflow valves regulate the cabin pressure

A

One!! This is a correction to a previous card

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26
Q

How many safety valves

A

Two…

One for overpressure relief

failedOne for negative pressure relief

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27
Q

Cabin altitude exceeds 14,000 feet

A

O2 masks deploy

14000 +-300

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28
Q

CABIN ALT WARNING

A

cabin altitude is greater than 10,000 feet

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29
Q

DIFF PRESS WARNING

A

differential pressure greater than 8.6 PSI

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30
Q

CABIN ALT caution

A

Cabin altitude is greater than 8500 feet but not greater than 10,000 feet

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31
Q

OVBD COOL caution?

A

Ground valve failed open with passenger and service door closed

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32
Q

What is the cabin altitude limitation regarding the pressurization system

A

The outflow valves will close to prevent The cabin from increasing above 14,500 +-500

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33
Q

Pressurization is controlled by

A

A single electric controlled outflow valve

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34
Q

ACSC stands for

A

Air conditioning system controller

2 ACSC’s

#1 ... Left HPV. LCV ISOL
#2....right HPV

2 channels/controller
1 active /1standby
No EICAS indication for activechnnel

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35
Q

ACSC PROVIDES ?

A

Ice protection 4 packs
Auto shutdown
2 flowrates

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36
Q

PRSOV fail safe?

A

Closed

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37
Q

How many pressurization valves

A

1

Completely electric

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38
Q

What happens if both CPC’s fail?

A

Outflow valves go to a barometric hold

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39
Q

Recirc fan off at what temp?

A

OFF if “cabin” temp is greater then 30 degrees

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40
Q

Ground valve functions in 2 Ways

A

Ensures aircraft is depressurized on the ground

Allows avionic warm air to dump

41
Q

FAULT. Lt on pack switch?

A

Failed in both auto and man modes

Mes 8-20-3

42
Q

Ram air passes over the packs for cooling and is then vented overboard thru

A

An exhaust vent on the lower aft fuselage

43
Q

Where is px compartment exhaust air routed?

A

Underfloor to the outflow valves

44
Q

Flt compartment exhaust air is routed?

A

Underfloor through the avionics compartment to the outflow valve

45
Q

Display fans ?

A

( 2 display fans) 1 fan draws in air from the flight deck and mixes it w/ conditioned air and supplies it ti the back of the each display.

46
Q

Avionics fans?

A

Used to extract heated air from bhind flt comp displays and from avionics equipment.

In gnd .. Heated air dumped overboard .. Gnd valve

In flt … Outflow valve

47
Q

Cargo switch .. Off pisition?

A

Both shutoff valves closed, system disabled

48
Q

Air position?

A

Both shutoff valves open.. Recirc air keeps temp abv freezing

49
Q

Cond air?

A

Both SOV open , heater enabled

50
Q

Cabin altitude limitation?

A

Outflow valves close cabin altitude about 14,500 feet

51
Q

What happens when either engine start switch light is pressed?

A

The pack. Valves automatically close

Controlled by a ACSC

52
Q

How many pressure schedules?

A

2

Normal pressure for two packs

Increased pressure for one pack

53
Q

FAULT light on the pack switch?

A

Pack has failed In both automatic and manual mode

left right pack caution

54
Q

When should the recirc fan switch be selected to off?

A

When cabin temperature is warmer than 30°C

55
Q

Recirc fans pool air from…

A

Cabin floor and returns it to mixing manifold

56
Q

Are both forward and aft cargo bays pressurized?

A

Yes

57
Q

Which cargo bay is ventilated by conditioned air?

A

Only the aft cargo bay

58
Q

Aft cargo switch should not be selected to conditioned air when?

A

Ambient temps are above 15°C

59
Q

How are all phases of pressurization controlled in the Auto mode?

A

Through two cabin pressure controllers

Only one controller is active

Switches three minutes after WOW

60
Q

How many outflow valve?

A

1

Located on aft pressure bulkhead

61
Q

How many safety valves?

A

2

Provide overpressure and negative pressure relief

62
Q

How are the safety valves operated?

A

Pneumatically operated and spring loaded closed

63
Q

What is the purpose of the ground valve?

A

Ensures aircraft is depressurized on ground

Also dumps CRT and avionics air overboard

64
Q

When do oxygen masks drop?

A

14,000 feet plus or -300

65
Q

Cabin alt caution?

A

8500 feet

66
Q

With a failure of the CPCP??

A

Auto oxygen mask deployments and illumination of fasten seatbelt and no smoking signs will not occur

67
Q

2 display cooling fans..

A

Fan 1 gives cooling during flight

Fan two gives cooling on the ground

Standby:conditioned air cools displays
( no fan)

68
Q

Cabin altitude limitation?

A

14500 +- 500

The outflow valve will close to prevent an increase in cabin altitude

69
Q

How many outflow valve’s

A

1

70
Q

How many safety valves

A

2

Overpressure
Under pressure

( mechanical)

71
Q

Are the cargo compartment pressurized

A

Yes

72
Q

Maximum positive differential pressure

A

8.6

73
Q

Negative differential pressure is limited to

A

-.5 psi

74
Q

RAVR?

A

Ram air regulating valve

Nornally open

Status? Failed open or towards closed

75
Q

Left pack auto fail master caution

A

Failure of respective pack in automatic mode… and system not in manual mode

76
Q

Ram air enters which side

A

The left side

77
Q

The flight compartment CRTs fans?

A

Avionics cooling fans

Fan 1 operate during flight

Fan 2 operates on the ground

Standby fan as back up

78
Q

Selecting STBY on the avionics cooling fan does what?

A

Permits conditioned air to ventilate the displays

79
Q

Test: CARGO OVHT

A

cargo bay temperature greater than 35°C

80
Q

Test: CARGO OVHT

A

cargo bay temperature greater than 35°C

81
Q

SINGLE OUTFLOW VALVE!!!

A

SINGLE OUTFLOW VALVE!! 6/7/20

82
Q

The packs are cntrolled by?

A

ACSC

Air conditioning system controllers

83
Q

Recirculation fan must be switched off when the cabin temperature is warmer than

A

30 degrees

84
Q

AFT CARGO SWITCH?

A

Do not select conditioned air if ambient temperatures are above 15°C

85
Q

In the avionics cooling system selecting standby on display cooling will?

A

Turn off fans to have conditioned air cool the displays

86
Q

PACK MEANS?

A

Pneumatic air conditioning kit

87
Q

FAULT LIGHT on pack switch?

A

Pack has failed in both automatic and manual mode

3-3 systems ac and press 6/7/20

88
Q

ACSC 1 Controls the left pack

ACSC 2 controls the rt pack

A

3-3 systems

89
Q

There are two air-conditioning system controllers.. Each controller has?

A

Two parts one of which is active the other is standby and monitors

90
Q

When a pack is operated in manual mode the selected temperature indicated for the associated pack is?

A

Removed from the ECS synoptic page

91
Q

RAM AIR VALVE Allows air from the ram air scoop to enter the mixing Manifold For distribution to?

A

Both the flight deck and the passenger cabin

3-9 systems ac and press 6/7/20

92
Q

The cargo conditioned air is controlled by?

A

ACSC2

93
Q

How many safety valves?

Operated?

A

There are two safety valves in the pressurization system pneumatically operated

Spring loaded closed

94
Q

At 8500 cabin alt

A

No smoking fasten seatbelt sign

If in auto

95
Q

Maximum differential pressure

A

8.6 +-.1

3-23 systems ac and press 6/7/20

96
Q

Cargo htr temp?

A

70 - 80

97
Q

FAULT lt on pack ?

A

Failed in both automatic and manual mode

98
Q

Aft cargo been heater maintains what temperature

A

Between 70 to 80°F

3-14

99
Q

Cargo overheat caution when temperature exceeds what temperature in the aft cargo compartment

A

95°F

100
Q

What is used to cool the equipment in the avionics bay?

A

Exhaust air from the flight deck cabin and CRT displays

3–17

101
Q

In manual mode, how is the outflow valve controlled?

A

Electrically by switches on the cabin press panel

Crj 900 (45 decks)

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