Accident Overview
A banner-towing airplane was maneuvering over a construction site adjacent to a golf course in Beaumont when it entered an unintended descent. The pilot was unable to recover before the airplane struck the ground in an open area of the golf course.
Flight Sequence
According to the pilot, the flight's purpose was to overfly construction sites near the golf course while towing a banner. The takeoff, banner pickup, and transit to the assigned area proceeded without noted discrepancies. After reaching the location, the pilot began circling the construction site. During an initial westerly turn, the airplane experienced a rapid sink rate. The pilot applied additional power and turned east, but the sink continued. Initially suspecting wind shear, the pilot believed the airplane would recover once the turn was completed. As the descent persisted, the pilot considered the possibility of an engine failure and elected to perform a forced landing on the golf course.
Witness Observations
Witnesses reported seeing the airplane in a nose-high pitch attitude during its descent. They noted the banner being dragged through trees before it was released from the airplane.
Post-Accident Examination
An inspection of the engine found no pre-impact mechanical anomalies that would have prevented it from producing full power. The propeller showed damage consistent with being under power at the time of impact. The banner release mechanism was functionally tested and operated normally.
Weather Conditions
Review of local weather data around the time of the accident indicated winds of 5 knots or less at the surface and aloft. No atmospheric conditions conducive to wind shear or downbursts were present.
No determination of the cause of the rapid descent was made in the investigation.