What parameters are indicated by the First Limit Indicator (FLI) needles?

• A. Power Level, Fuel Flow, RPM
• B. TRQ, TOT, N1
• C. Speed, Altitude, Heading
• D. Oil Pressure, Fuel Quantity, Weight

Answer: (B)

The First Limit Indicator (FLI) is a critical component within the cockpit instrumentation of some aircraft, particularly helicopters. It typically provides real-time data concerning the aircraft’s engine performance and operational limits. The parameters indicated by the FLI needles include Torque (TRQ), Turbine Outlet Temperature (TOT), and N1 (the speed of the first-stage turbine).

Torque indicates the engine's power output and allows pilots to monitor engine performance and avoid exceeding limits that could risk engine damage. Turbine Outlet Temperature is crucial as it reflects the thermal performance of the engine, ensuring it operates within safe temperature margins. The N1 value helps in assessing the engine's operational status and efficiency.

The other parameters offered in the incorrect options do not accurately reflect the primary functions of the FLI. While they may represent important data points within aircraft operation, they fall outside the specific role and focus of the FLI indicator.