No fatalities

Engine Failure and Crash After Takeoff from Marathon Airport (N7871B)

Marathon, United States of AmericaTakeoff (climb)

On July 10, 1965, a Beechcraft C18S (registration N7871B) operated by Monroe County Mosquito Control District (MCMCD) was involved in an aviation accident near Marathon, United States of America during takeoff. No fatalities were reported. Investigators recorded the probable cause as: Double engine caused by an inadequate preflight preparation on part of the pilot. The fuel selector was positioned between tanks. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 1 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 2026-06-12Data APIEditorial standards

Shortly after takeoff, both engines failed, causing the aircraft to stall and crash into the sea. The pilot was uninjured, but the aircraft was lost.

Accident Overview

An aircraft experienced a dual engine failure shortly after departing from Marathon Airport. During the initial climb, both engines stopped simultaneously, leading to a stall. The aircraft subsequently crashed into the sea, a few dozen yards from the shore. The pilot, who was the sole occupant, sustained no injuries and was rescued promptly. The aircraft was destroyed.

Investigation Findings

An investigation determined the probable cause of the double engine failure. The official finding stated that the incident resulted from inadequate preflight preparation by the pilot. Specifically, the fuel selector was positioned between tanks, which likely prevented proper fuel flow to both engines. No other contributing factors were identified.

Sequence of Events

The flight began with a takeoff from Marathon Airport. As the aircraft climbed, both engines failed in quick succession. With no thrust available, the aircraft lost lift and stalled, descending into the water. Emergency services responded swiftly, and the pilot was rescued unharmed.