What happened
A flight operated by the Monroe County Mosquito Control division began low-altitude spraying operations at approximately 1740 EDT. After the aircraft failed to return as scheduled, a search operation was initiated.
At approximately 0245, the aircraft was located in a remote area on Water Key, near the town of Summerland Key, Florida. The accident is estimated to have occurred at about 2030 EDT, following sunset, which had taken place at 1952 EDT.
Evidence recovered from the scene indicated that the aircraft struck 40-foot-high mangrove trees with its left wing. This impact occurred while the pilots were executing a procedure turn intended to begin another spraying run.
The investigation
The investigation found no evidence of any preimpact mechanical failure or malfunction regarding the aircraft or its engines. Weather conditions in the vicinity of Key West, approximately 22 miles southwest, at 1750 EDT included scattered clouds at 1500 feet, 10 miles visibility, and winds from 330 degrees at 10 knots.