The non-instrument-rated private pilot's departure had been delayed, and he was in a hurry to fly home. The pilot elected to fly over mountainous terrain in dark, nighttime conditions. Recorded radar data shows that after cruising for nearly 2 hours, the airplane initially entered a slow descent from 12,600 to 11,100 feet. Thereafter, the radar track shows the airplane commencing a clockwise turn while continuing to descend. While reversing course, the pilot became spatially disoriented, and the airplane rapidly descended, as evidenced by its sudden disappearance from radar. During the descent the airplane broke apart. Wreckage was found on a 6,400-foot (mean sea level) mountain and was scattered over a 950 by 350 foot oval-shaped area. The major components that separated were the horizontal stabilator, the vertical tail surfaces, and the 6-foot-long outboard span of both wings. The propeller blades exhibited signatures consistent with the absorption of rotational energy during ground impact. No preimpact anomalies were found during the wreckage examination and all fractures were overload in character. The descending flight profile, followed by the course reversal away from the pilot's destination, was consistent with a spiral maneuver. The structural breakup resulted from aerodynamic forces induced by the pilot's recovery attempts that exceeded the airframe's strength.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:

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