On 18 April 2013, an Airbus A340-300 was unintentionally taxied off the side of the runway during a 180° turn after backtracking the departure runway at Tabriz at night. The Investigation found that the prevailing wet runway conditions meant that the runway width alone was insufficient for the turn and full advantage had not been taken of a wide taxiway at the runway displaced threshold. It was also found that the technique used to turn had not been optimum and that the runway involved was for daylight use only and had a strength rating not compatible with A340 use.