What does "crossover airspeed" refer to in an engine failure scenario?

Crossover airspeed is a crucial concept during an engine failure scenario, particularly in multi-engine aircraft. It refers to the speed at which the thrust from the functioning engine is sufficient to overcome the drag produced by the aircraft, allowing for controlled flight. As the aircraft loses an engine, the pilot must maintain a specific airspeed to ensure that the remaining engine can produce enough thrust to balance the drag, thus preventing a loss of control.

When operating below crossover airspeed, the drag exceeds the thrust, making it impossible to maintain level flight without descending. Achieving or exceeding this airspeed is essential to safely operate the aircraft in a single-engine configuration, enabling the pilot to execute maneuvers necessary for a successful landing or to return for a go-around, should the situation allow. Understanding this concept is vital for pilots to manage engine-out situations effectively.