THE DTSB
The DTSB determines the Probable Cause of this accident to be a failed flight control system, in that the accident aircraft upper right push-pull tube was found separated from the lower rod end (part number D173-2), which remained
attached to the upper hydraulic servo piston shaft at the clevis (part number D200-1). The palnut and jam nut that secure the upper right push-pull tube to the rod end could not be
rotated by hand on the rod end threads. The upper right push-pull tube was observed to be elongated at the threaded end (see figure 2). Remnants of torque stripe paint was present on
the push-pull tube, palnut, and jam nut. This was the first flight on the accident aircraft after having completed a 100 hour inspection which was signed off on the same day as the accident.