Use of ASPD is limited to greater than __________ KIAS.

• A. 30 KIAS
• B. 50 KIAS
• C. 60 KIAS
• D. 40 KIAS

Answer: (D)

ASPD is a stabilization/protection feature that is only reliable when there is enough airflow over the rotor and sensors. It relies on accurate airspeed input to assist without fighting the pilot’s commands. At very low speeds, rotor downwash and gusts dominate, and the system can respond unpredictably or become overbearing, which can make handling worse rather than better. Because of that, the feature is restricted to speeds above a threshold so it can perform as intended without destabilizing the helicopter. The 40 KIAS limit ensures the system is engaged only when translational lift is present and the performance envelope has been validated, avoiding interference during hover or very slow flight.