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Job Study > PT6A-42 Engine Limitations > Flashcards

PT6A-42 Engine Limitations Flashcards

1
Q

Max ITT during engine start

A

800 to 850 °C (20 second limit)
850 to 1000°C (5 second limit)
>1000 °C (5 second limit)

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2
Q

Oil temp limitation for engine start

A

-40 minimum

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3
Q

Low idle ITT limit

A

750

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4
Q

Low idle prop RPM limit

A

1180

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5
Q

Low idle oil pressure limit

A

Minimum of 60 PSI

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6
Q

Low idle oil temp limits

A

-40 to +99 °C

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7
Q

High idle oil temp limitations

A

-40 to +99 °C

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8
Q

T/O and MCT torque limits

A

2230 FT-LBS

Excursions up to 2275 FT-LBS limited to 7 minutes

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9
Q

T/O and MCT ITT limits

A

800 °C

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10
Q

T/O and MCT N1 limits

A

101.5%

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11
Q

T/O and MCT prop RPM limits

A

2000 RPM

Excursions up to 2040 RPM are limited to 7 minutes

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12
Q

T/O and MCT oil pressure limits

A

100 to 135 PSI

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13
Q

T/O and MCT oil temperature limits

A

0 to 99 °C

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14
Q

MAX CRUISE torque limits

A

2230 FT-LBS

Excursions up to 2275 FT-LBS limited to 7 minutes

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15
Q

MAX CRUISE ITT limits

A

800 °C

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16
Q

MAX CRUISE N1 limit

A

101.5%

17
Q

MAX CRUISE prop RPM limits

A

2000 RPM

Excursions up to 2040 RPM limited to 7 minutes

18
Q

MAX CRUISE oil pressure limits

A

100 to 135 PSI

19
Q

MAX CRUISE oil temperature limits

A

0 to 99 °C

20
Q

CRUISE CLIMB AND NORMAL CRUISE torque limits

A

2230 FT-LBS

Excursions up to 2275 FT-LBS limited to 7 minutes

21
Q

CRUISE CLIMB AND NORMAL CRUISE ITT limits

A

770 °C

22
Q

CRUISE CLIMB AND NORMAL CRUISE N1 limits

A

101.5%

23
Q

CRUISE CLIMB AND NORMAL CRUISE prop RPM limits

A

2000 RPM

Excursions up to 2040 RPM limited to 7 minutes

24
Q

CRUISE CLIMB AND NORMAL CRUISE oil pressure limits

A

100 to 135 PSI

25
Q

CRUISE CLIMB AND NORMAL CRUISE oil temp limits

A

0 to 99 °C

26
Q

MAX REVERSE ITT limits

A

750 °C

27
Q

MAX REVERSE N1 limit

A

88%

28
Q

MAX REVERSE prop RPM limit

A

1900 RPM

29
Q

MAX REVERSE oil pressure limit

A

100 to 135 PSI

30
Q

MAX REVERSE oil temperature limit

A

0 to 99 °C

31
Q

TRANSIENT torque limit

A

2750 FT-LBS
Limited to 5 seconds

32
Q

TRANSIENT ITT limit

A

850 °C

33
Q

TRANSIENT N1 limit

A

102.6%
Limited to 10 seconds

34
Q

TRANSIENT prop RPM limit

A

2200 RPM
Limited to 5 seconds

35
Q

TRANSIENT oil pressure limit

A

200 PSI

36
Q

TRANSIENT oil temperature limit

A

99 to 104 °C
Limited to 10 minutes

37
Q

What is the torque limit for propellor RPM’s below 1600?

A

1100 ft-lbs

38
Q

What oil pressures are undesirable during flight? And what is the torque limitation when the oil pressure falls within this range?

A

60 to 85 PSI is undesirable.
Max torque 1100 ft-lbs when operating in this range.

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