What is the minimum airspeed for controlled flight with a failed engine?

The minimum airspeed for controlled flight with a failed engine in the King Air 350 is 120 KIAS. This speed is crucial for maintaining control and ensuring that the aircraft remains responsive to pilot inputs during the critical phase of engine failure. At this minimum airspeed, the aircraft is above the stall speed, which allows adequate maneuverability and helps prevent uncommanded yaw or bank towards the failed engine.

Maintaining 120 KIAS provides a safe margin above stall speed and allows the pilot to effectively manage the asymmetrical thrust created by the remaining operating engine. This airspeed facilitates better climb performance and increases the aircraft's safety during single-engine operations, whether in climb, descent, or level flight. Additionally, it ensures that the aircraft can still be controlled in the event of sudden changes in configuration or environmental conditions, further enhancing overall safety in flight operations.