Engine Limitations

Question 1

Min battery voltage for engine start

Answer 1

24V

Question 2

Engine start attempt sequence

Answer 2

Attempt 1: ON (30s), cooling down (1 min)
Attempt 2: ON (30s), cooling down (1 min)
Attempt 3: ON (30s), cooling down (30 mins)

Question 3

Max transient TRQ (10 sec)

Answer 3

115%

Question 4

Max T/O Power TRQ

Answer 4

(5 min at T/O) (cumulative per sortie) 111%

Question 5

Max continuous TRQ

Answer 5

92%

Question 6

Max engine start TOT (10 sec over 810°C)

Answer 6

927°C

Question 7

Max transient TOT (6 sec over 810°C)

Answer 7

899°C

Question 8

Max T/O power TOT (5 min at T/O) (cumulative per sortie)

Answer 8

810°C

Question 9

Max continuous TOT

Answer 9

752°C

Question 10

N2 Max transient limit (15 sec max above 2132 N2)

Answer 10

2233 N2

Question 11

N2 max continuous speed

Answer 11

2132 N2

Question 12

N2 Max static ground ops with crosswind component >10kts (this is relevant to the propeller overspeed governor check)

Answer 12

1850 N2

Question 13

N2 Speed avoidance range

Answer 13

1523-1786 N2

Question 14

Details of N2 speed avoidance range

Answer 14

N2 must not be allowed to stabilise in the speed avoidance range
Applies in both forward and reverse thrust
Operation within the speed avoidance range is permitted for pre-flight, post-flight checks and taxy
If the speed avoidance range is breached on the ground or in flight, no maintenance action is required

Question 15

Max transient N1 (max 15 sec > 105% N1)

Answer 15

106% N1

Question 16

Max continuous N1

Answer 16

105% N1

Question 17

Max transient oil pressure for cold weather/ engine start

Answer 17

150psi

Question 18

Max oil pressure

Answer 18

130psi

Question 19

Min oil pressure at N1 at or above 94%

Answer 19

120psi / 105psi (beta range)

Question 20

Min oil pressure at N1 85% to 94%

Answer 20

90 psi / 75psi beta range

Question 21

Min oil pressure at N1 < 85%

Answer 21

50psi / 35psi (beta range)

Question 22

Oil pressure limitation note

Answer 22

Min permitted oil pressure decreases linearly by 2 psi for each 1000ft above 5000ft pressure altitude to a max reduction of 20 psi

Question 23

Max oil temperature limit at TRQ < 40%

Answer 23

107°C

Question 24

Max transient oil temperature at TRQ at or above 40% (5 min)

Answer 24

107°C

Question 25

Max continuous oil temperature at TRQ at or above 40%

Answer 25

82°C

Question 26

Min oil temp

Answer 26

0°C

Question 27

Min oil temp before starting

Answer 27

-40ºC