Incident Overview
A pilot reported that while taxiing along a taxiway parallel to an active runway, he was adjusting his intercom system controls. The controls were located on the floor between the front seats. At the point where the taxiway turned 90 degrees at the end of the runway, the aircraft did not turn and continued straight ahead. It departed the pavement and entered a dirt area. Approximately 20 feet beyond the end of the taxiway pavement, the aircraft encountered a ditch and nosed over onto its back.
Pilot Actions
The pilot stated that his attention was diverted by the intercom controls during the taxi. The aircraft's path remained straight despite the taxiway's geometry. The deviation from the taxiway resulted in the aircraft leaving the paved surface.
Sequence of Events
The taxiway ran parallel to the active runway. At the runway's end, the taxiway made a 90-degree turn. The aircraft failed to negotiate this turn and proceeded straight. It ran off the pavement into dirt. After traveling about 20 feet, the aircraft struck a ditch, causing it to flip onto its back.
Damage and Outcome
The aircraft sustained damage from the impact with the ditch and the subsequent inversion. No other details were provided regarding injuries or the extent of damage.