Engine-out training teaches us to maneuver the airplane to a position from which a more-or-less normal landing can be made on an open surface. Among the elements to this training are that there's a finite amount of time and energy, in the form of altitude, available to get the airplane to the landing area. Maneuver the airplane to a key position abeam the runway at a certain altitude and airspeed, and it will have enough energy to glide to the "runway" as the pilot manages airspeed and turns.
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