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ATR type Rating > Skyblue CBT propeller system > Flashcards

Skyblue CBT propeller system Flashcards

1
Q

what controls the propeller?

A

PEC in conjunction with:

  • overspeed governer
  • autofeather system
  • alternate autofeather system
  • synchrophase system
  • power and condition levers
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2
Q

what does the PEH provide for the pitch change mechanism?

A

closed loop control

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3
Q

what does the PEC do if it senses a system fault?

A

detects and isolates the fault

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4
Q

how many channels make up the PEC?

A
  1. Master and backup
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5
Q

where does the PEC get airspeed and altitude from?

A

EEC

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6
Q

what does the PEC use to calculate prop speed?

A

EEC data and NP

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7
Q

how does the EEC provides overspeed protection?

A

acts on HMU to limit NH via a stepper motor

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8
Q

how does the PEC control prop pitch angle?

A

through the propeller valve module (PVM)

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9
Q

what 4 components make up the PVM?

A
  1. electro hydraulic valve
  2. protection valve
  3. feather solenoid
  4. rotary variable differential transducer (RVDT)
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10
Q

what 6 things does the PVM provide?

A
  1. basic speed set
  2. beta scheduling
  3. reversing
  4. synchrophasing
  5. prop feathering
  6. low pitch protection
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11
Q

how is blade angle controlled by the PVM in constant speed and beta modes?

A

controlled metering of oil pressure

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12
Q

how is blade angle controlled by the PVM in feather and overspeed modes?

A

dumping oil pressure

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13
Q

what is unmetred oil pressure always opposed by?

A

metered oil pressure which is then applied to the opposite side of the assembly

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14
Q

where does aerodynamic force tend to drive the prop blade?

A

to low pitch angles

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15
Q

what does the prop pitch lock ensure if oil pressure is lost from the PVM?

A

prevents aerodynamic loads reducing the blade angle by more than 1 degree

prevents speed increasing by more than 2%

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16
Q

when the power levers are in the forward thrust range, how is RPM set?

A

condition lever position sets rpm via the EHV located in the PMV via oil pressure changes

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17
Q

when in flight governing mode how is RPM set?

A

power lever angle through the PVM

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18
Q

what min propeller speed is maintained by the EEC in the ground beta/fuel governing mode?

A

70.8% NP

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19
Q

what does power lever angle command when in the ground beta range?

A

commands PVM to incrase or decrease oil pressure

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20
Q

what happens when blade angle reaches the commanded position?

A

blade angle feedback acts on the PVM to hold the blades at the new position

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21
Q

what provides torque info to the MFD, MFC and FDAU?

A

auto feathering unit

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22
Q

what provides torque info to the MFD from the power turbine shaft?

A

signal conditioning unit

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23
Q

what handles the autofeather and uptrim logic?

A

the MFC

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24
Q

What does the MFC command when an EFATO occurs?

A

commands uptrim on live engines EEC

commands oil pressure to feather the failed engine through the feathering solenoid

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25
Q

when is ATPCS armed on the ground? (5)

A
  1. PWR MGT to takeoff
  2. ATPCS button pushed in
  3. both torques greater than 46%
  4. both PLA greater than 49 degrees
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26
Q

what is available when ATPCS is aremd in flight?

A

only autofeather

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27
Q

when is autofeather commanded?

A

when torque drops below 18%

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28
Q

what happens when ATPCS senses torque lower than 18% on the ground?

A

uptrim command is sent to EEC on unaffected engine and the live engine bleed is closed

2.15 seconds later the failed engine will autofeather

29
Q

what happens when autofeather is triggered?

A

affected feather solenoid is activated and the affected feathering pump activates

autofeather is inhibited on the unaffected engine

30
Q

when will ATPCS disarm under normal conditions?

A
  1. PWR MGT anywhere but takeoff
  2. both torques more than 46%
  3. either PLA more than 49 degrees
  4. ATPCS button off
31
Q

what is NP?

A

prop rotation speed

32
Q

what do the 2 sensors on the reduction geartrain sent outputs to?

A

EEC which controls torque counter

AFU which controls torque pointer

33
Q

when will the torque pointer show amber?

A

100-106% torque

34
Q

when will the torque pointer show red?

A

over 106%

35
Q

what does an amber LAB under torque indication mean?

A

wrong EEC installed

36
Q

what does an amber HBV under the torque indication mean?

A

associated handling bleed valve has failed

37
Q

what does the FDAU calcualte and display on the torque indication?

A

target torque displayed in amber (or magenta on a G/A)

38
Q

what do 3 amber xxx in the torque indication mean?

A

invalid PWR MGT value

39
Q

when is NP shown in amber?

A

between 41.6% and 62.5%

40
Q

when is NP shown in red>

A

NP above 107%

41
Q

how is ITT sensed?

A

thermocouple sensros between the low pressure turbine and power turbine

42
Q

what is the red range on the ITT gauge?

A

715C hotel mode

765C take off

800C in flight

43
Q

what does a red S on the ITT gauge mean?

A

950C start limit

44
Q

what is NH?

A

high pressure turbine RPM

45
Q

what is normal NH range?

A

62-103.1%

46
Q

what is amber NH range?

A

103.2-106.3%

47
Q

when will NH show red?

A

above 106.4%

48
Q

what is NL?

A

low pressure turbine RPM

49
Q

what is amber NL range?

A

104.2-106.7%

50
Q

what is red NL range?

A

greater than 106.8%

51
Q

what does the PWR MGT supply info to?

A
  • FDAU
  • PIU
  • EEC
52
Q

What does the engine rating interface unit allow?

A

the crew to select an engine rating between the original rating and a boost rating by incraseing the thermal limit

53
Q

when is the boost function available?

A

when on the ground

in flight following an engine failure

54
Q

how much is torque increased by if boost is used with PWR MGT set to T/O?

A

4.5% up to 4000ft and then 4%

55
Q

how much is torque increased by if boost is used with PWR MGT set to MCT?

A

4%

56
Q

when do we get an ENG BOOST caution?

A

when there is a disagreement between button position and the rating of the EEC’s

57
Q

when will we get an amber ENG 1 PEC caution?

A

both channels on the PEC have failed

58
Q

when will we get an amber ENG 1 PEC SGL CH caution?

A

one of the PEC channels has failed

59
Q

what will NP be blocked at when a PEC is turned off?

A

102%

60
Q

What does the crank selection on the knob do?

A

motors the engine without ignition

61
Q

what does turning the knob to start A and B do?

A

ignites both ignition exciter units regardless of on ground or in flight

62
Q

what will the starter generator connect to when the START button is pushed?

A

either the main battery, operating generator or external power through the STARTER BUS depending on the power source

63
Q

what des the starter generator drive during start?

A

the high pressure spool to an RPM of 20%NH

64
Q

at what NH is the condition lever moved from fuel shut off to introduce fuel?

A

10%

65
Q

what is self sustaining NH?

A

45.5%

66
Q

what disconnects at 45.5% NH during start?

A

starter generator and ignition

67
Q

what can cause a start fault?

A

starter gen remaining engaged past 45.5

failure of GCU

prop brake on

68
Q

what is ignition powered by?

A

DC ESS BUS

ATR type Rating (22 decks)

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