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ATR type Rating > Skyblue CBT propellor control > Flashcards

Skyblue CBT propellor control Flashcards

1
Q

what is the normal takeoff power setting?

A

2475SHP

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2
Q

what SHP does the automatic uptrim setting provide following an EFATO?

A

2750SHP

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3
Q

what components make up the two spool gas generator?

A

a high pressure and low pressure compressor powered by their respective turbines

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4
Q

how does the power turbine drive the propeller?

A

via a power turbine shaft which links to a propeller reduction gear box and then the propeller shaft

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5
Q

what does the intake design ensure?

A

uniform inward flow is supplied to the compressors

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6
Q

what are the 2 purposes of the S shaped design of the inlet?

A
  1. FOD removal (air is lighter so it goes up to the compressors while FOD is too heavy and goes down and overboard
  2. to divide the airflow into a primary flow for the engine and a secondary flow for the oil cooler
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7
Q

where is the accesory gearbox mounted?

A

at the top of the engine

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8
Q

what is the accesory gearbox driven by?

A

high pressure compressor shaft

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9
Q

what 3 components are driven by the accesory gearbox?

A

1 high pressure fuel pump

  1. oil pumps
  2. DC Starter/generator
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10
Q

what does the DC starter/generator drive during engine start?

A

accesory gearbox in order to accelerate the high pressure compressor rotor to the necessary speed

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11
Q

what 4 components does the propeller reduction gearbox connect to?

A
  1. propeller overspeed governer
  2. 115 volt ACW GENERATOR
  3. propeller valve module
  4. high pressure pump

engine 2 also connects to the prop brake

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12
Q

where is the fuel cooled oil cooler located?

A

aft of the propeller reduction gearbox

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13
Q

what kind of propeller does the ATR have?

A

Hamilton Standard 568F prop which is composite

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14
Q

what is the propeller driven by?

A

free power 2 stage turbine through the reduction gearbox

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15
Q

what powers the free power turbine?

A

exhaust gases

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16
Q

what is propeller pitch controlled by?

A

hydro mechanically controlled by a propeller valve module installed on the prop reduction gearbox

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17
Q

what changes the propeller pitch?

A

oil pressure from the lubrication system supplied by a feathering pump

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18
Q

how is the propeller feathered?

A

metered oil pressure is dumped

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19
Q

what does each PEC control? (6)

A
  1. PVM
  2. Phase sync of the props
  3. overspeed governor
  4. autofeather system
  5. alternate autofeather system
  6. power and condition levers
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20
Q

how does the PEC control the pitch change mechanism?

A

through 1 or 2 channels

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21
Q

how does the PEC select the correct prop speed

A

PEC calculates correct pitch using altitude and speed data and prop rotation data.

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22
Q

what does the PEC interface with to get altitude, speed and prop rotation data?

A

the EEC

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23
Q

WHAT DOES THE PROPELLER INTERFACE UNIT DO?

A

provides interfcae between the engine controls in the flight deck and the PEC

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24
Q

what `6 functions does the propeller valve module have?

A
  1. speed setting
  2. beta scheduling
  3. propeller feathering
  4. synchrophasing
  5. low pitch protection
  6. overspeed protection
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25
Q

what 4 components make up the propeller valve module?

A
  1. electro hydraulic valve
  2. protection valve
  3. feather solenoid
  4. rotary variable differential transducer (RVDT)
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26
Q

what does the electro hydraulic valve in the PVM do?

A

meters oil to the pitch change actuator and allows normal feathering of the prop

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27
Q

what is the protection valve in the PVM part of?

A

overspeed, lo speed protection systems and backup feathering protection

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28
Q

what is the feather solenoid a backup for?

A

the electro hydraulic valve

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29
Q

what does the RVDT do?

A

adjusts and confirms the power lever angle (PLA)

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30
Q

where is the prop brake installed?

A

canter shaft of the right engine prop reduction gearbox

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31
Q

what does the prop brake stop?

A

the propeller and power turbine

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32
Q

describe hotel mode

A

high pressure compressor rotor drives right AC generator and bleed air pressure is available downstream of the high pressure compressor to supply the packs

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33
Q

when can the prop brake be engaged?

A

on the ground with blue hydraulic pressure available

condition lever in feather

gust lock engaged

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34
Q

what must be illuminated prior to engaging the prop brake?

A

green ready light

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35
Q

how does the EEC control fuel flow to the HMU to get the desired high pressure compressor speed (NH)?

A

a stepper motor

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36
Q

what powers the EEC’s?

A

DC EMER BUS

BUS 1 AND 2

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37
Q

what 4 information inputs does the EEC recieve?

A
  1. power lever angle
  2. power management panel selected mode
  3. position of bleed air valves
  4. outside conditions
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38
Q

what are EEC inputs used for?

A

to calculate a new power setting before corrections are sent to the HMU stepper motor

39
Q

when the EEC button is selected off, how does HMU control NH?

A

based on position of power lever

40
Q

what does a flashing EEC fault mean?

A

a fault has occured at a power lever angle of more than 52 degrees. the power will be locked at the pre-fault value

41
Q

what should we do if we get a flashing EEC fault?

A

bring power lever into the green, This causes reversion into HMU based law. EEC can be selected off.

42
Q

what do we lose if we deselect the EEC?

A

propeller underspeed at low power

43
Q

how to power levers control fuel flow above the beta range when manual fuel scheduling?

A

via the HMU

44
Q

how do power levers control fuel flow when manually fuel scheduling below the beta range?

A

PVM

45
Q

when does flight beta range begin?

A

below 62 degrees power lever angle

46
Q

what is the ground beta range?

A

between ground idle and flight idle stops

47
Q

what do the condition levers control through a valve in the HMU?

A

PROP FEATHERING, SPEED AND FUEL SHUTOFF

48
Q

when is top law used?

A

when the the selected EEC is used

49
Q

when is base law used?

A

when the EEC is inoperative or deselected and fuel flow is determined by the PLA

50
Q

What will NH change with in base law mode?

A

ambient conditions

51
Q

what will we not have in base law mode?

A

underspeed control

52
Q

what does the underspeed control in top mode stop the NH from going below?

A

70.8%

53
Q

what mode prevents NH overspeed protection?

A

top law

54
Q

when is the NH backup law acivated in top law mode?

A
  • low power settings
  • hotel mode
  • engine torque control failure
55
Q

how does top law optimise low pressure compressor operation?

A

modulation of handling bleed valve

56
Q

what are the 3 modes of propeller speed governing?

A
  1. blade angle governing mode
  2. fuel governing mode
  3. transition mode
57
Q

what is the normal prop governing mode for flight?

A

blade angle governing mode

58
Q

in blade angle govenring mode, how is the blade modulated?

A

PVM adjusts pitch as to maintain constant speed. Available regardless of EEC status

59
Q

how is the engine managed in blade angle governing mode?

A

power management selector orders engine speed through the PEC and the Power levers command the power

60
Q

when is fuel governing mode available?

A

when the condition lever is in the auto position

61
Q

what happens in the fuel governing mode?

A

EEC increases fuel flow to maintain minimum propeller speed

62
Q

when is fuel governing mode not available?

A

when feathered or the EEC is off

63
Q

when is transition mode active?

A

on the ground

in flight at low speed/power setting

64
Q

what will the prop speed be in the transition mode?

A

between 70.8% and 100%

65
Q

what are the power levers mechanically connected to?

A

the PVM and HMU

66
Q

How do the power levers control thrust?

A

through blade angle and fuel flow

67
Q

what does the pvm control?

A

propeller pitch, which regulates propeller speed (NP)

68
Q

what controls pitch change in the forward thrust range?

A

PVM

69
Q

what will the PVM do as power levers are retarded to flight idle?

A

PVM reduces blade angle to maintain selected propellor RPM as long as the condition levers are in auto

70
Q

when do the power levers acquire direct blade angle control?

A

slightly above flight idle

71
Q

what happens if prop speed drops below 70.8%

A

EEC increases fuel flow to maintain 70.8%

72
Q

what is the flight beta range?

A

FI and above

73
Q

what is the ground beta range?

A

FI to max reverse

74
Q

when is the flight idle gate unlocked?

A

as 1 landing gear shock absorber is compressed

75
Q

what does the trigger on the power levers do?

A

allows the pilot to pull the PL from the flight idle detent into the ground range

76
Q

what does the PVM do in the FI to GI range?

A

regulates power to provide speed governing in the FI to GI range

77
Q

what regulates fuel flow and prop speed in the reverse range?

A

the PVM and HMU

78
Q

what does each condition lever provide inputs to?

A

HMU and PVM of the associated engine

79
Q

when in the forward thrust constant speed range what does the condition lever set?

A

sets prop speed through input to the governor and PVM

80
Q

what engine speed is governed at the 100% overide detent on the condition lever

A

1200rpm

81
Q

how does the condition lever control propeller speed in the auto position?

A

through the power management selector position

82
Q

what is disabled with the condition lever in the feathered position?

A

propeller underspeed governing

83
Q

what does the ATPCS provide for the failed engine?

A

automatic feathering

84
Q

what 5 conditions arm the ATPCS?

A
  1. PWR Management set for takeoff
  2. ATPCS button armed
  3. both power levers greater than 49 degrees
  4. both toques greater than 46%
  5. aircraft on ground
85
Q

when will automatic uptrim be disabled?

A

when power management is moved out of takeoff

86
Q

what does the AFU supply torque indications to?

A

fdau

mfc

flight deck indication

87
Q

what does the MFC handle during an engine failure?

A
  • autofeather logic
  • uptrim logic
  • signals the effected solenoid and feathering pump
  • signals the uptrims
88
Q

when does uptrim occur?

A

2.15 seconds prior to autrofeather

89
Q

what is the only power management system used to restart a failed engine?

A

MCT

90
Q

what does the EEC interface with?

A

the PEC and the HMU

91
Q

what is propeller speed governed at in the 100% override position?

A

1200rpm

92
Q

how is ground idle operation permitted with the propeller feathered?

A

underspeed fuel governor is disabled with CL in feather

93
Q

how is the prop unfetahered following an engine restart in flight?

A

selecting MCT on the PWR MGT panel

ATR type Rating (22 decks)

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