Engine Limitations

Question 1

Min battery voltage for engine start

Answer 1

24V

Question 2

Engine Start Limitations
Start attempts

Answer 2

Start attempt 1
- Starter ON 30 sec
- Cooling Down 1 min

Start attempt 2
- Starter ON 30 sec
- Cooling Down 1 min

Start attempt 3
- Starter ON 30 sec
- Cooling Down 30 mins

Question 3

Max Transient TRQ (10 sec)

Answer 3

115%

Question 4

Max T/O Power TRQ (5 min at T/O) (cumulative per sortie)

Answer 4

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

Propeller RPM (N2)
Max Transient Limit (15 sec max above 2132 N2)

Answer 10

2233 N2

Question 11

Propeller RPM (N2)
Max Continuous Speed

Answer 11

2132 N2

Question 12

Propeller RPM (N2)
Max Static Ground Ops with Crosswind component > 10 kts
This is relevant to the Propeller Overspeed Governor Check

Answer 12

1850 N2

Question 13

Propeller RPM (N2)
Speed Avoidance Range

Answer 13

1532-1786 N2
- N2 must not be allowed to stabilize within the Speed Avoidance Range
- The Speed Avoidance Range applies when 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 14

Gas Generator RPM (N1)
Max Transient N1 (max 15 sec > 105% N1)

Answer 14

106% N1

Question 15

Gas Generator RPM (N1)
Max Continuous N1

Answer 15

105% N1

Question 16

Oil Pressure
Max Transient (cold weather/engine start)

Answer 16

150 psi
BETA RANGE

Question 17

Oil Pressure
Max

Answer 17

130 psi
BETA RANGE

Question 18

Oil Pressure
Min at N1… ≥ 94%

Answer 18

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

Question 19

Oil Pressure
Min at N1… 85% to 94%

Answer 19

90 psi
75 psi

Question 20

Oil Pressure
Min at N1… < 85%

Answer 20

50 psi
35 psi

Question 21

Oil Temperature
Max Limit at TRQ… < 40%

Answer 21

107°C

Question 22

Oil Temperature
Max Transient at TRQ ≥ 40% (5 min)

Answer 22

107°C

Question 23

Oil Temperature
Max Continuous at TRQ ≥ 40%

Answer 23

82°C

Question 24

Oil Temperature
Min Temp

Answer 24

0°C

Question 25

Oil Temperature
Min Before Starting

Answer 25

-40°C