What does engine-out performance refer to in flight?

Engine-out performance specifically refers to an aircraft's ability to maintain controlled flight on the remaining engine when one engine has failed. This is a crucial aspect of multi-engine flying, as it assesses how well the aircraft can be controlled and maneuvered in the event of an engine failure, particularly during critical phases of flight such as takeoff and climb.

In the context of a multi-engine aircraft, understanding engine-out performance involves knowing factors such as the minimum controllable airspeed, the aircraft's handling characteristics during an asymmetric power situation, and the specific operational procedures required to manage an engine failure effectively. Pilots need to be trained in these areas to ensure safety and competency when flying multi-engine aircraft.