An emergency turn in aviation is a proscribed turn used in the event of an engine failure on departure where the loss of an engine would not allow the aircraft to complete the SID (Standard Instrument Departure). For example, in areas of high terrain a normal departure will specify the climb gradient required to clear the terrain. If the loss of one engine would mean the aircraft could not clear the terrain, an emergency turn will be proscribed which will bring the aircraft away from the terrain.