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Flight Manual Section 1: Description > 1.5 Power Plant > Flashcards

1.5 Power Plant Flashcards

1
Q

What is the rated horsepower of the engine?

A

1600 SHP

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2
Q

What is the name of the engine?

A

Pratt and Whitney (P&W) PT-6 Free turbine engine

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3
Q

What material are blades made of?

A

Graphite

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4
Q

What direction do blades spin in?

A

Clockwise when viewed from the cockpit

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5
Q

What are the two main sections of the engine?

A

Gas generator + Power Turbine

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6
Q

What does gas generator section contain?

A

1) Intake
2) Compressor section (4 axial + 1 centrifugal stage)
3) Combustion chamber
4) Compressor turbine

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7
Q

What engine section drives the accessory gearbox at the rear of the engine?

A

Gas generator section

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8
Q

What drives the power turbine section?

A

Flow from gas generator section

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9
Q

How many stages of turbine are on the power turbine section?

A

2

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10
Q

What drives the reduction gearbox at the front of the engine? What does the reduction gearbox drive?

A
  • The power turbine section

- Reduction gearbox drives the propeller at the front

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11
Q

Why do the gas generator and power turbine sections rotate in opposite directions?

A

To minimize gyroscopic effects

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12
Q

What does a reverse flow engine mean on the PT-6A engine?

A

Air is sent to the rear of the engine and then makes its way through the various stages to the front of the engine.

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13
Q

What does the PMS do?

A

Controls the engine power output in conjunction with PCL by adjusting:

  • Fuel Flow
  • Prop blade angle
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14
Q

What was the main components of the PMS?

A

1) PMU
2) PMA
3) FMU
4) PCL
5) PIU
6) DCU

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15
Q

How can the PMS modes be changed?

A

Through the PMS push button on the ENGINE panel

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16
Q

What are the two PMS modes?

A

AUTO and MAN

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17
Q

What is ground idle in PMS Manual Mode? Flight Idle in PMS manual mode? Ground Idle for PMS Auto? Flight Idle for

A

PMS Manual:

  • Ground Idle = 67.5 +- 7 %
  • Flight Idle = 67.5 +-7%

PMS Auto:

  • Ground idle = min 54%
  • Flight Idle = 80%
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18
Q

What should the PCL be set at when selecting the PMS to manual?

A

At mid-power or lower power setting.

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19
Q

What provides power to the PMU during normal ops?

A
  • PMA which is driven by the reduction gearbox.

- During engine start/shutdown, powered by BATT BUS.

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20
Q

What does the PMS restrict the engine power to on the ground and during TO below speeds of 80 KIAS?

A

1080 SHP

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21
Q

What is the engine power output above speeds of 80 KIAS?

A

Linearly increases from 1080 SHP to 1600 SHP from 80 KIAS to 200 KIAS.

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22
Q

What is min ground idle in PMS auto? Normal ground idle?

A
  • 50.7% min

- 54% normally

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23
Q

What is flight idle NG with PMS Auto?

A

80%

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24
Q

When is PMS idle zero thrust in the air?

A

At speeds of 120-140 KIAS

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25
Q

What is the flight idle setting controlled by?

A

The nose WOW switch.

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26
Q

During touch and go, what should be done with the nose to allow quicker acceleration?

A

Kept off the ground.

27
Q

What is the usual measure for power for TO, cruise and approach?

28
Q

Are the PCL’s mechanically interconnected?

29
Q

In case of PMU failure, what connects the PCL to FMU?

A

Bowden cable.

30
Q

What is the range of movement of the PCL? What degrees is FUEL OFF, IDLE and MAX?

A

90 deg range of movement
FUEL OFF = 5 deg
IDLE = 30 deg
MAX = 85

31
Q

What must be done to put PCL to fuel off?

A

Release safety catch and raise idle detent lever then move it rearwards.

32
Q

What does PCL in FUEL OFF position do regarding fuel flow and prop angle?

A
  • Cuts off fuel flow to engine

- Electrically activates the prop feathering system

33
Q

Where are the two mechanical chip detectors?

A
  • In propeller reduction gearbox

- In accessory gearbox

34
Q

What are the three positions of the Ignition system and what do they do?

A

IGN = Igniters operate manually
AUTO = Igniters operate automatically controlled by the PMU
Off - Igniters are inhibited

35
Q

What indications are shown when the igniters are operating?

A

Green IGN status message illuminates on both the DPW and MFD ENG page with a lightning symbol

36
Q

What powers the GEN 1 (combined starter generator) during engine start?

37
Q

What are the three starter switch positions and what do they mean?

A 
MAN = starter motor energized manually
AUTO = PMU controls starter motor and automatic start sequence when auto start button is pressed
OFF = starter is inhibited
38
Q

What MFD page will show when starter activates?

A

MFD ENG page

39
Q

What caption will show if either Igniters switch is set to IGN or OFF and/or Starter switch is set to MAN or OFF?

A

PMS Fault caption

40
Q

Explain magnetic latching of STARTER and IGN switches?

A
  • Front seat selection to IGN/MAN or OFF will cause the rear switch to snap to AUTO.
  • To correct a switch in the front cockpit, rear cockpit must be held to the rear position to AUTO and verbal communication must be established with the front cockpit to correct switch position.
41
Q

What are the three engine modes of starting?

A

1) PMS Automatic Mode - Automatic Shutdown function enabled - PMS Auto and PCL is less than 3 deg beyond idle. Automatic shutdown and dry run is initiated.
2) PMS Automatic mode - Automatic shutdown function disabled - PMS AUTO is selected and PCL is beyond 3 deg past idle
3) PMS Manual Mode - PMS Manual

42
Q

What must be done with PMS and PCL to enable auto-start?

A

PMS = On with no captions showing

PCL at FUEL OFF to enable auto-start

43
Q

What captions are shown on MFD ENG page during automatic engine start?

A

AUTO START and IGN captions

44
Q

How can the auto-start be aborted?

A

1) PCL to FUEL OFF

2) Pressing AUTO START button again before start sequence is complete (Before NG = 54% min)

45
Q

What is recommended following an auto-start abort?

A

An engine dry run is recommended

46
Q

Below what voltage should BATT 1 be recharged before attempting an engine start? How is this done?

A
  • 23.6V

- By connecting GPU and turning on BATT 1

47
Q

Below what voltage should external power be used for engine start?

48
Q

What are minimum battery voltages for engine start on internal power?

A

-10 C = 24.3 V
0 deg = 24.1
10 deg = 24.0
20 deg = 23.9

49
Q

Above what OAT will the starter automatically initiate a dry crank of the engine on setting the PCL to FUEL OFF?

50
Q

What are the two fire detectors? Where is detector 1, where is detector 2?

How do they work?

A
  • Fire detector 1 is around the hot section of the gas generator case
  • Fire detector 2 is around the accessory gearbox
  • Continuous loops filled with gas that expands when heated, activating a thermal switch indicating fire is present.
51
Q

What is the normal prop speed?

52
Q

What is prop RPM on ground at engine idle position?

A

Min 800 RPM

53
Q

When is prop electrically commanded to feather?

A

When PCL is set to FUEL OFF

54
Q

Is PIU oil pressure high when pitch is fine?

A

Yes

When PIU oil pressure low = Prop is coarse

55
Q

What are the 2 purposes of the erosion strip on the prop?

A
  • To protect it from leading edge surfaces of each blade from effects of erosion
  • To provide an earth path for lightning
56
Q

DOes the prop have de-icing strips?

57
Q

Where is fuel flow displayed?

A

MFD and EMD

58
Q

Where is engine TQ displayed?

A

MFD and EMD

59
Q

Where is ITT displayed?

A

MFD and EMD

60
Q

Where is gas generator speed NG displayed?

A
  • MFD permanently

- EMD if out of limits

61
Q

Where is prop speed displayed?

A
  • MFD on ENG page

- EMD if out of limits

62
Q

Where is oil pressure displayed?

A

MFD and EMD

63
Q

Where is oil temperature displayed?

A
  • MFD permanently on ENG page

- EMD if out of limits

64
Q

Will the blades feather if the oil pressure or engine fails, even if PCL Fuel OFF is selected?

A

Yes but it will take longer

Flight Manual Section 1: Description (11 decks)

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