Casualties unknown

Mosquito Control Aircraft Crashes on Water Key After Striking Mangrove Trees (N28889)

Summerland Key, FL, US

On May 3, 1989, a Douglas C-47 (registration N28889) was involved in an aviation accident near Summerland Key, FL. Investigators recorded the probable cause as: THE FAILURE OF THE PILOT-IN-COMMAND TO ASSURE PROPER ALTITUDE AND CLEARANCE WAS MAINTAINED ABOVE THE TERRAIN AND TREES. THE TREES AND LIGHT CONDITION AT DUSK WERE CONTRIBUTING FACTORS. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-10Data APIEditorial standards

A Monroe County mosquito control flight crashed on Water Key near Summerland Key, Florida. The aircraft struck 40-foot mangrove trees during a procedure turn for a spray run. No preimpact failure was found.

Accident Overview

A mosquito control operation conducted by Monroe County began at approximately 1740 EDT for low-altitude spraying. When the aircraft failed to return, a search was initiated. At around 0245, the aircraft was located in a remote area on Water Key near the town of Summerland Key, Florida.

Evidence at Scene

Examination of the accident scene indicated that the aircraft struck 40-foot-high mangrove trees with its left wing while the pilots were executing a procedure turn to commence another spray run. No evidence of preimpact failure or malfunction of the aircraft or its engines was discovered.

Timing and Conditions

There were no known witnesses to the accident, which was estimated to have occurred at approximately 2030 EDT. Sunset on that day was at 1952 EDT. Weather observations from Key West, about 22 miles southwest, at 1750 EDT reported scattered clouds at 1,500 feet, visibility of 10 miles, and wind from 330 degrees at 10 knots. Approximately 85 miles north-northeast, the wind was from 100 degrees at 11 knots.

Search and Recovery

After the flight's failure to return, search efforts were mounted. The aircraft was found in the early morning hours on Water Key, a remote area. Details regarding the aircraft type, registration, and number of occupants have not been released.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X28371. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.