Maximum Engine Overtorque refers to which concept for turbopropeller and turboshaft engines with free power turbines in OEI ratings?

• A. The maximum torque of the free power turbine rotor assembly that may occur for up to 20 seconds without engine rejection
• B. The maximum torque of the main rotor during takeoff
• C. The minimum torque required to maintain flight
• D. The average torque during cruise

Answer: (A)

Maximum Engine Overtorque is the peak torque the free power turbine rotor assembly may experience during one-engine-inoperative operation, and this transient may be sustained for up to 20 seconds without triggering engine rejection. In turboprop/turboshaft engines with a free power turbine, the power turbine, which drives the output, can see brief spikes in load when there’s abrupt power changes or gusts. The limit allows a short overshoot to maintain controllability in OEI conditions, after which the torque should stay within normal bounds. This focus is on the free power turbine, not the main rotor torque or a continuous/average value.