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ATR type Rating > skyblue CBT air con and pressurisation > Flashcards

skyblue CBT air con and pressurisation Flashcards

1
Q

where are the 2 packs located?

A

in the gear bays

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2
Q

where is the external air plug located?

A

right hand side of aircraft

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3
Q

what does the left duct supply?

A

flight deck and pax cabin

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4
Q

what does the right duct aupply?

A

pax cabin

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5
Q

can one pack supply both compartments?

A

yes, through the mixing chamber

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6
Q

what conditions bleed air after the pack valve?

A

air cycle machine (one on each side of the aircraft

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7
Q

where does conditioned air go after the air cycle machine?

A

the mixing chamber under the flor of the aircraft to be mixed with ambient air

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8
Q

how is air evacuated from the cabin and where does it go?

A

guides along left floor of the cabin

recircualted to the cabin or exhausted through outflow valves under the aft fuselage

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9
Q

how is the toilet ventilated?

A

a vent line regulated by cabin differential pressure

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10
Q

how is pressurisation regulated?

A

by constricting the amount of air vented overboard by opening and closing outflow valves under the aft fuselage

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11
Q

how are the pack valves controlled and operated?

A

electrically controlled and pneumatically operated

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12
Q

what is the purpose of the pack valves?

A

shut down the pack and maintain a constant air supply pressure to the pack

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13
Q

what powers both pack valves?

A

DC ESS BUS

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14
Q

what pressure will the pack valves deliver to the packs with the flow button out?

A

22psi

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15
Q

what pressure will the pack valves deliver to the packs with the button pressed in? (hi flow)

A

30psi

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16
Q

where is the primary heat exchanger located?

A

landing gear fairing

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17
Q

where does air flow after the pack valve?

A

heat exchanger

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18
Q

what does the ground cooling fan do?

A

blows air over the heat exchanger if ram air is insuffcient

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19
Q

how is the ground cooling fan powered?

A

pneumatic air through an impeller controlled by the turbofan shutoff valve

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20
Q

when does the turbofan shutoff valve open?

A

airspeed less than 150knots

gear extended or retracted for less than 10 mins

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21
Q

when is the turbofan shutoff valve closed?

A

anytime the airspeed is greater than 150 knots

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22
Q

what will the turbofan shutoff valve do if opposite low oil pressure is sensed?

A

open as long as speed is 150 or less

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23
Q

what will the pack valve do if the turbo fan shutoff valve is not in the commanded position?

A

close to prevent pack damage

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24
Q

where does air flow after the heat exchanger?

A

compressor, secondary heat exchanger

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25
Q

where does air for the heat exchangers come from?

A

ram air flow

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26
Q

where is air from the secondary heat exchanger sent?

A

used to power the turbine

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27
Q

what does air do once it reaches the turbine section?

A

undergoes rapid expansion which decreases temp

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28
Q

what controls airflow into the turbine?

A

turbine inlet control valve

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29
Q

where does air flow to from the turbine?

A

a condenser and then a mixing chamber

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30
Q

how does the condensor dry the air?

A

uses air from the primary heat exchanger to send air to the water extractor, then back through the turbine and to the mixing chamber

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31
Q

how is temperature control acheived?

A

mixing bleed air tapped downstream of the pack valve and air produced by expansion turbine

32
Q

what controls how much bleed air is used wih regard to temperature control?

A

temperature controller set by electronic controller or the rotary knob in the flight deck

33
Q

what information does the electronic temperature controller use to determine temperature whe set to auto?

A
  1. compartment ambient temperature
  2. aircraft skin temperature
  3. pack supply duct temperature
34
Q

what is temperature limited to by the pack duct in manual mode?

A

88C

35
Q

what temperature will trigger the AIR DUCT OVHT?

A

92C

36
Q

at what temperature will the pack valve close if the overheat is downstream of the compressor?

A

204C

37
Q

what does the mixing chamber mix?

A

air produced by air from pack and ambient cabin air

38
Q

how is cabin air evacuated?

A

2 recirculation fans which send air back to the mixing chamber

39
Q

what powers the recirculation fans?

A

DC UTIL BUS

40
Q

when will the recirculation fans automatically run at full speed?

A

when cabin floor temp is less than 18C

41
Q

what will cause a AIR RECIRC FAN caution?

A

fan speed too low

associated electric motor overheats

42
Q

what parts of the plane are ventilated by ambient air?

A

flight deck

forward cargo compartment

electronic racks

43
Q

where is ambient air from the flight deck, electric racks and forward cargo compartment sent?

A

pressurised compartment or overboard

44
Q

what does the ventilation extract fan do?

A

draws air into the forward compartment to cool flight deck, electric racks and flight instruments

45
Q

what speed will the extract fan operate at if flight deck temp is below 20 degrees?

A

low

46
Q

what speed will the flight deck fan operate at if flight deck temperature is above 52 degrees?

A

high

47
Q

why would we use the extract air flow lever?

A

to stop air from flowing forward if smoke is detected in forward cargo compartment

48
Q

how long will the extract fan stop for during start to avoid pressure shocKS?

A

120 seconds

49
Q

what does the overboard valve do?

A

allows air from the extract valve to be sent overboard

50
Q

on the ground with engine 1 or has low oil pressure what will the overboard valve do?

A

it will be open. extract fan will run normally. underfloor will be closed

51
Q

what will the extract fan do in flight or with engine 1 running on the ground?

A

underfloor valve open

overboard valve closed

52
Q

what controls air outflow for pressurisation?

A

1 pneumatic outflow

1 electro pneumatic outflow

53
Q

what happens with the pressurisation system in auto mode?

A

pneumatic outflow valve is slaved to the electro pneumatic outflow valve which allows them to operate simultaneously

54
Q

when will the outflow valve protection activate through the manometric capsules?

A

positive differential pressure greater than 6.35psi

negative 0.5psi

55
Q

what powers the pressurisation digital controller?

A

DC BUS 1

56
Q

how does the digital controller position the outflow valves?

A

a torque motor

57
Q

what 4 parameters does the digital controller use to calculate required cabin pressure?

A
  1. departure field elevation
  2. destination field elevation
  3. existing cabin altitude
  4. aircraft altitude (baro if ADC 1 STD if ADC 2)
58
Q

which valve is used in manual pressurisaton mode?

A

pneumatic only

59
Q

what ROC/ROD can be set in manual mode?

A

-1500 to +2500rpm

60
Q

what does setting the pressure knob to 9-10 o clock ensure when switching to manual mode from automatic?

A

ensures no pressure bump at the switch over

61
Q

what signal does the landing gear microswitch give to the pressurisation digital controller?

A

determines how much pressure is given to the outflow valve after takeoff to maintain field elevation after 3500ft

62
Q

what is the maximum cabin rate of climb?

A

550fpm

63
Q

what is max cabin pressure differential?

A

6 psi

64
Q

at 25000ft, what will the cabin altitude be?

A

6740ft

65
Q

what is max descent rate of cabin altitude?

A

400fpm

66
Q

what pressure will the controller set for landing?

A

landing elevation -300ft

67
Q

what will the digital controller do at touchdown?

A

open the outflow valves to reach field elevation

68
Q

when is the automatic return feature available?

A

up to 3500ft

69
Q

what does the FAST button do?

A

uses a descent rate of 500fpm

70
Q

what is duct temperature limited to in automatic mode?

A

88c

71
Q

when should we not open the overboard valve?

A

when differential pressure is more than 1psi

72
Q

what will be triggered if we deselect the exhaust mode push button on the ground?

A

ground mechanic call

73
Q

what does the ditch push button do?

A

closes both outflow valves with 2 electric motors powered by the DC EMER BUS

74
Q

what will open if we press the dump button?

A

both outflow valves

75
Q

what are the indications of a succesful pressurisation test?

A

18800

-8800 on the digital controller

76
Q

when is the pressurisation test inhibited?

A

in flight

ATR type Rating (22 decks)

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