On August 17, 1999, a Grumman American AA-5 (registration N1370R) was involved in an aviation accident near Newcastle, WY. Investigators recorded the probable cause as: The pilot's inadequate visual lookout and inadequate altitude/clearance from the transmission wires. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A light aircraft struck high-voltage transmission wires during a sightseeing flight, resulting in a post-impact fire that destroyed the plane and killed everyone on board.
What happened
The pilot was conducting sightseeing flights for relatives attending a family reunion. During the fifth flight of the day, the airplane carried three passengers in addition to the pilot. While flying approximately 5 nautical miles north of the airfield, the aircraft collided with electrical transmission wires situated 214 feet above ground level. The impact caused the airplane to crash and come to rest 924 feet south of the power lines. A fire broke out immediately after the collision and consumed the entire aircraft.
Findings
The primary factor in this accident was the impact with electrical transmission wires. The flight phase was identified as en route sightseeing. The weather conditions at the time were not specified in the available records. No specific mechanical failure of the aircraft prior to impact was noted. The pilot was operating the aircraft during these recreational flights.
Safety message
Pilots conducting sightseeing or low-altitude flights must maintain strict awareness of terrain and overhead obstacles, particularly power lines which may not be visible from certain angles or distances. Flight planning should include detailed obstacle surveys for the intended route to avoid inadvertent encounters with high-voltage infrastructure.