Use of TRK is limited to greater than how many KIAS?

• A. 20 KIAS
• B. 30 KIAS
• C. 40 KIAS
• D. 50 KIAS

Answer: (C)

Tracking (TRK) mode relies on stabilized flight and reliable ground-track guidance from the navigation system, which requires a certain amount of forward airspeed to work properly. When the helicopter is moving faster than about 40 KIAS, the sensors can accurately determine the ground track and the flight control system can coordinate the aircraft to follow that path without overreacting to rotor wash or wind gusts. Below that speed, the dynamics of the rotorcraft and the limitations of the navigation guidance make track guidance unstable or unreliable, so the system restricts use of TRK to speeds above 40 KIAS. In practice, use TRK once you’re cruising or transitioning at a safe forward speed, and avoid engaging it in hover or very slow flight.