How does the Pilatus PC-12 NG indicate engine performance?

The Pilatus PC-12 NG indicates engine performance by displaying torque, Interstage Turbine Temperature (ITT), RPM, and fuel flow on the primary flight display. This set of parameters provides critical insights into the engine’s operational status, allowing pilots to monitor performance effectively during all phases of flight.

Torque is an important metric as it reflects the engine's power output, while ITT indicates the temperature of the exhaust gases, which is vital for assessing engine health and performance limits. RPM shows the rotational speed of the engine, which is crucial for confirming that the engine is operating within its designed parameters. Fuel flow information is essential for understanding fuel consumption and managing fuel efficiency throughout the flight.

These combined data points give pilots a comprehensive overview of engine performance, which is critical for safe flight operations and efficient engine management. The other options may include various engine indicators, but they do not comprehensively capture the full scope of performance data as effectively as the correct answer does.