High engine thrust during maintenance activity can cause considerable damage to airplanes and other elements on an airport. An example of the problem occurred at night when the pilot of a Beech 58 returned to Chicago O’Hare International Airport (KORD) on March 13, 1985. After landing, the pilot requested clearance to the TWA hangar and was cleared on the most expeditious route, which passed by a pad where a maintenance crew was running up the engines on a Boeing 747. The resulting jet ...


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