On May 16, 1993, a Lake LA-4-200 (registration N35HM) operated by Legg, Thomas C. was involved in an aviation accident near Springport, MI. Investigators recorded the probable cause as: The pilot's misjudgment of available engine power during takeoff, which led to an aborted departure and subsequent impact with a grassy mound. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A pilot attempted to abort a takeoff from a lake, believing the amphibian airplane lacked sufficient power. The aircraft struck a grassy mound before coming to rest.
What happened
The incident occurred while an amphibious airplane was attempting to depart from a body of water. During the initial phase of the takeoff roll, the pilot perceived that the engine was not generating adequate thrust to continue the departure. Acting on this assessment, the pilot decided to abort the maneuver.
During the aborted takeoff attempt, the aircraft departed the water surface and impacted a grassy mound. The force of the collision brought the airplane to a halt. Following the stop, the pilot conducted an immediate inspection of the cockpit controls and discovered that the throttle was positioned in the fully open setting, indicating that engine power should have been at maximum.
The investigation
A thorough post-accident examination of the aircraft was conducted to determine if any mechanical failures contributed to the event. Inspectors checked the propulsion system and associated components for signs of malfunction or failure. The inspection failed to reveal any mechanical anomalies or defects in the airplane's systems that would have prevented normal engine operation.
Probable cause
The pilot's misjudgment of available engine power during takeoff, which led to an aborted departure and subsequent impact with a grassy mound.