One Engine Inoperative (OEI)

One Engine Inoperative (OEI) refers to a situation, particularly in aviation, where a multi-engine aircraft loses power in one of its engines while still being airborne. This scenario requires the pilot to manage the aircraft’s remaining engine(s) effectively to maintain control and perform a safe flight, whether it involves returning to the airport, continuing to a destination, or preparing for an emergency landing. Pilots are trained to handle OEI situations, ensuring that the aircraft can still function safely despite the loss of engine power.