Utah

According to officials, the pilot of the aircraft registered 42-7183 bears full responsibility for this tragedy because he did not comply with basic rules of discipline during a training flight. However, investigators point out that the massive presence of ice in the region remains a contributing factor to the accident in the sense that aircraft performances were reduced.

On the basis of all of the facts, conditions and circumstances known to the Board at this time, it is concluded that failure of the left, or possibly both wing tips, and of the horizontal tail surfaces occurred in the air during a severe pull-up. However, no definite conclusion can be drawn from the evidence as to whether the pull-up was caused by operation of the controls by the crew, or by some other forces beyond their control. Due to the lack of any plausible theory for the latter, it seems more probable that the maneuver was initiated by the crew, possibly in an attempt to avoid collision with a bird, another aircraft, or some object which they saw or thought they saw.
Probable cause:
Failure of the left, or possibly both wing tips and of the horizontal tail surfaces as a result of a sever pull-up which caused unusual and abnormally high air loads. The reason the pull-up maneuver was not determined.

Engine explosion.

Navigational error on part of the crew for unknow reasons. At the time of the accident, the aircraft was deviated from its initial track. Civil Aeronautic Board was not able to establish the exact cause of the track deviation. Upon the basis of the foregoing findings and of the entire record available at this time, CAB find that the probable cause of the accident was a deviation from the proper course, for reasons undetermined, after the trip had become off contact within ten miles of the airport.