Incident Overview
The aircraft, a four-engine type, was operating a round trip itinerary from Incirlik Air Base with stops at Sinop, Erzurum, and Erzincan. During the flight segment from Erzurum to Erzincan, while cruising at an altitude of 20,000 feet, the aircraft suddenly went out of control. It entered a dive and impacted the ground, disintegrating in a snow-covered field near Gevenlik, approximately 68 kilometers northeast of Erzincan Airport. The aircraft was completely destroyed, and all 27 persons on board were killed.
Investigation Findings
The official investigation determined the probable cause of the accident. It was found that engine number 4 separated from the aircraft during flight. After detaching, it struck engine number 3 and the wingtip fuel tank. This collision led to the detachment of the wing, resulting in a loss of control and the subsequent crash.
Mechanical Analysis
Investigators believe that the detachment of engine number 4 was caused by the loss of a nut. The absence of this nut allowed vibrations to develop, which eventually caused the engine spar to fracture. However, the specific reason for the nut being missing could not be identified.