Engine Limits

Question 1

What is Critical Altitude?

Answer 1

The Altitude at which 100% torque is no longer available with the throttle at MAX. Approx. 16000ft on a standard day.

Question 2

What is Max Climb Power

Answer 2

The amount of power available during climb when above critical altitude.
This setting is the throttle position which yields an ITT 13°C below max power ITT at critical altitude; not to exceed 807°C.

Question 3

What is Max Cruise Power?

Answer 3

The amount of power available for cruise flight when above critical altitude.
This setting is the throttle position that yields an ITT 40°C below the observed max ITT at critical altitude; not to exceed 780°C.

Question 4

What are the takeoff/max power, idle and transient torque limits?

Answer 4

Takeoff/Max power: 100
Idle: 1 to 10 (ground)
Transient: 132 (20 sec)

Question 5

What are the takeoff/max power, idle and transient maximum values for ITT?

Answer 5

Takeoff/Max power: 820
Idle: 750
Transient: 821 to 870 (20 sec)

Question 6

What are the takeoff/max power, idle and transient limitations for N1?

Answer 6

Takeoff/Max power: 104 max
Idle: 60 to 61 (ground) - 60 min (flight)
Transient: 104 max

Question 7

What are the takeoff/max power, idle and transient limitations for Np?

Answer 7

Takeoff/Max power: 100 max
Idle: 46 to 50 (ground)
Transient: 110 max (20 sec)

Question 8

What are the takeoff/max power, idle and transient oil pressure (psi) limitations?

Answer 8

Takeoff/Max power: 90 to 120
Idle: 90 min
Transient: 40 to 130

Question 9

What are the takeoff/max power, idle and transient oil temperature (°C) limitations?

Answer 9

Takeoff/Max power: 10 to 105
Idle: - 40 to 105 (ground) ; 10 to 105 (flight) ; 106 to 110 (acceptable for ground operation at < 20% Tq)
Transient: 106 to 110 (10 mins)

Question 10

Torque above what value is indicative of a system malfunction?

Answer 10

102%