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Dash Tech > Powerplant and Propellers > Flashcards

Powerplant and Propellers Flashcards

1
Q

NTOP Horsepower

A

2142 SHP

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2
Q

NTOP RPM and Torque

A

1200 (max 1212), 92% TQ (90 in air)

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3
Q

NTOP Nh and ITT

A

101% Nh, 765deg ITT

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4
Q

Can you exceed the NTOP ITT limit?

A

Yes up to 5degrees for 30seconds

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5
Q

MTOP Hp

A

2380 SHP

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6
Q

MTOP TQ + RPM

A

100%, 1200 RPM

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7
Q

MTOP limits

A

102.7%NH, 800ITT, 105.6%TQ, 1212RPM

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8
Q

How long can you have MTOP set for?

A

5 mins max

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9
Q

Max continuous power?

A

90%/1200RPM or 96%/1125RPM or lower. 102.7%NH, 800ITT

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10
Q

Max Transient NH and ITT

A

103.7%NH and 840deg ITT

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11
Q

Max transient TQ and RPM

A

115% and 1320RPM

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12
Q

What is the time limit for transient settings?

A

20Sec unless otherwise stated

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13
Q

Normal oil pressure range?

A

55-65PSI (60PSI)

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14
Q

When is an oil pressure lower than 55 PSI allowed?

A

40-55PSI permitted below 75%NH as per QRH

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15
Q

What pressure does the OIL PRESS warning come on?

A

42 PSI +/-2

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16
Q

What is the action for an OIL PRESS warning?

A

ENGINE FIRE/FAIL/SHUTDOWN

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17
Q

Memory items for ENGINE FIRE/FAIL/SHUTDOWN

A 
P/L FI
C/L off
Aux Fx FX
T handle PULL
Aux pump off
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18
Q

Normal minimum oil pressure?

A

55PSI

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19
Q

Minimum temp for Unfx?

A

0deg

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20
Q

What is the normal oil temp range?

A

45-115deg

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21
Q

What is the significance of the minimum oil temp before takeoff?

A

Adequate temp for inlet rim anti-ice protection

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22
Q

When do the bypass doors have to be open?

A

On the ground below 10deg, in the air below 5deg, any visable moisture

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23
Q

When do the engine intake heaters turn on?

A

Below 15degrees and bypass doors open (w engine running)

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24
Q

What are the engine ITT starting limits?

A

800+ for 20secs, 840-900 for 12 secs, 900-950 for 5secs

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25
Q

What is the maximum time you can engage the starter for?

A

1 min

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26
Q

What are the Starter rest time requirements?

A

1/2/1/2/1/30

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27
Q

If we have an engine failure after take off with autofx armed, how much will the good engine uptrim by?

A

10% of current TQ

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28
Q

What compressor drives the ACC g/box?

A

NH

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29
Q

What accesories are driven by the accessory gbox? (Nh)

A

MFC
OIL PUMP
DC GEN
EDP

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30
Q

What acccessories are driven by the RGB?

A 
PCU
Oil pump for the PCU
Overspeed gov
Hydraulic pump
AC Gen
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31
Q

What prevent the P/L from being inadvertantly selected to below FI in flight?

A

gate + beta warning horn/lockout system (disables at 20ft RAD alt

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32
Q

What is the cockpit indication that an ECU has failed?

A

10% TQ uptrim on that engine,
ECU manual mode indicated on the ECU
#1/2 ECU MAN Caution

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33
Q

What precautions should you take on approach/landing with an engine in manual mode?

A

No precise fuel control/HBOV so small or smooth changes in power selection to prevent surge/stall,
No harmonic protection (500-780RPM) so not below disc on LDG,
Assymetric lever position for equal thrust
No auto uptrim if other engine fails

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34
Q

What is the normal position of the ignition switch for engine start?

A

AUTO

35
Q

When will the ignitors automatically come on in a normal start?

A

When start button is pushed

36
Q

What is the danger of moving the C/L above fuel off on the GND?

A

With any residual NH and ignitors in AUTO, ignition will activate as Nh below 60% with C/L forward of fuel off

37
Q

If electrical power is disconnected from an instrument what will the gauge indicate? what about the hydraulic gauges?

A

0 and the screen will go blank,

hydraulic gauges are AC powered so will indicate the same as before they failed

38
Q

What is the prop range in flight?

A

900-1200

39
Q

What provides overspeed protection?

A

Overspeed governer at 1250RPM

Pnuematic fuel cut at 1308RPM

40
Q

What are the memory items PROP OVERSPEED?

A 
Synchrophase off
P/L FI
Reduce airspeed
C/L Start/Feather
Alt FX, FX
If FX - ENG SHUTDOWN
If no FX - Alt fx off
C/L max
P/L As req not above 1212rpm
land at nearest suitable airport.
41
Q

Where does the PCU get its oil from

A

RGB oil pump

42
Q

What happens to the prop if there is a loss of oil pressure?

A

Pitch lock (1deg,2% RPM increase) towards fine.

43
Q

how is blade angle set in beta range?

A

with the P/L

44
Q

What RPM range is prohibited?

A

500-780?

45
Q

What is the Beta Back up system? How would you know it was operating and what can you do about it?

A

Prevents blades from reducing into ground beta in the air due to a linkage malfunction. The Ground range lights would be flashing/cycling.
advance the P/L to bring blade in alpha range

46
Q

When will the AUTO FX arm?

A

When selected AND
P/L both in T/O position,
both TQ above 38%

47
Q

When will auto Fx activate?

A

When selected.
When both P/L are still in the T/O position but one TQ is above 38% and one below 28%.
After a 3 second delay.

48
Q

How long is the Auto fx time delay?

A

3 seconds

49
Q

How do you deactivate auto fx?

A

bring both P/L to idle or press the auto feather button (like for setting climb power)

50
Q

What system protects the prop and power tubine if the P/L is selected to below F/I in flight?

A

Beta Lockout system

51
Q

If the LH prop was cycling around 1000rpm after T/O, what has happened? what will the QRH say to do?

A

LH P/L position microswitch failure

Reduce prop to 900 in climb to check it stops oscillating

52
Q

Once energised the Ax fx pump runs for how long?

A

18 secs

53
Q

Is Auto power uptrim available if auto fx is disarmed

A

no

54
Q

During which phase of flight is synchrophase used?

A

All except T/O and LDG (cannot be used at 1200rpm)

55
Q

What range should the props be within before the synchophase is activated?

A

within 20rpm of each other

56
Q

Minimum Nh to turn fuel on for start?

A

10%

57
Q

Memory items for APU fire?

A

Confirm auto shutdown and extinguish,

if needed manually activate bottle

58
Q

Is the prop and power turbine connected to the gas turbine?

A

No (free power turbine)

59
Q

Where is ITT measured?

A

after Nh turbine, before NP

60
Q

When should we open the bypass doors?

A

below 10deg on the ground with any visable moisture, below 5deg in the air with any visable moisture.
prescence of sluch snow ice etc on taxiways

61
Q

When does heated oil begin to circulate around the engine intake?

A

No req, it constantly circulates just needs 45deg oil to be effective.

62
Q

How fast (approximately) does the NH turbine spin in normal operation?

A

33000RPM

63
Q

When are the only 2 times the ignitors are on?

A

Start and relight (below 60%Nh in flight)

64
Q

What is the self sustaining Nh?

A

66%

65
Q

Where is the Fire detection and suppression located in the engine nacelle?

A

Fuel nozzles back

66
Q

What is the reduction ratio of the RGB?

A

16.6:1

67
Q

Can we use reverse thrust with an ECu in manual mode?

A

No (no harmonic protection)

68
Q

What is the approximate fuel pressure at 6% Nh?

A

100PSI

69
Q

What is the Fuel Pressure after the EDP?

A

980PSI

70
Q

When will the ignition activate if set to manual mode?

A

Continuously

71
Q

Approximately what Nh value will the oil pressure rise? why?

A

35%

This is approximately when the labrinth seals on the hot side of the engine seal

72
Q

Oil pressure start limit?

A

200PSI

73
Q

Min temp for a prop unfeather?

A

0 degrees

74
Q

Prop diameter?

A

4.12m

75
Q

Approximate Pressure of fuel before the EDP?

A

20PSI

76
Q

How much oil does the feathering pump have in reserve for its operation?

A

1.6L

77
Q

What does a green light on the auto fx mean?

A

Sensor is recieving pressure in the system

78
Q

Below what RPM can we consider a prop feathered?

A

300 and reducing

79
Q

What would be the indication of an unscheduled feather?

A

High Torque with low and/or reducing RPM

80
Q

What should you do in the event of an unscheduled feather?

A

ENG FAIL/SHUTDOWN

81
Q

How does the pnuematic governer limit RPM?

A

By reducing fuel flow to MFC, starting at 1308 RPM

82
Q

What are all the functions of the ECU?

A

Fine fuel control
Compressor surge/stall protection
Harmonic range protection
Power up trim
Obv control

83
Q

When do both beta back up and lock out become available on take off?

A

WOW and 50ft RADalt

Dash Tech (20 decks)

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