Casualties unknown

Pilot fails to arrest descent during low-altitude maneuver over private property (N737VP)

North Liberty, IN, US

On April 4, 1991, a Cessna C172N (registration N737VP) operated by Plymouth Avaition, Inc. was involved in an aviation accident near North Liberty, IN. Investigators recorded the probable cause as: The pilot's failure to maintain adequate airspeed and altitude during a low-altitude maneuver over private property, resulting in an inability to arrest the descent despite full power application. 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 2026-06-19Data APIEditorial standards

A pilot operating an aircraft low over his own property attempted to abort a landing by applying full power, but the plane settled into soft ground and struck a ditch. Post-accident inspection confirmed the engine was functioning normally.

What happened

The pilot was conducting operations in close proximity to his private residence, flying at a very low altitude while configuring the aircraft for landing. During this phase of flight, the pilot decided to abort the approach and applied full throttle in an attempt to arrest the aircraft's downward trajectory. Despite the application of maximum power, the airplane continued to descend and settled onto the soft, muddy terrain below. The pilot made further attempts to recover control and abort the landing, but the aircraft impacted a ditch before coming to a complete stop.

The investigation

Following the accident, investigators conducted a post-accident examination of the propulsion system. A ground run-up was performed on the engine to verify its operational status. The results indicated that the engine was capable of normal operation and did not exhibit any mechanical failures that would have prevented it from producing power.

Findings

The primary factor in this incident was the pilot's inability to arrest the descent despite applying full power. Contributing factors included the low altitude at which the maneuver was initiated and the nature of the terrain, which consisted of soft, muddy ground that likely impeded any potential recovery efforts after impact.

Probable cause

The pilot's failure to maintain adequate airspeed and altitude during a low-altitude maneuver over private property, resulting in an inability to arrest the descent despite full power application.

Frequently asked questions

What happened in the 4 Apr 1991 Cessna C172N accident near North Liberty, IN?

A pilot operating an aircraft low over his own property attempted to abort a landing by applying full power, but the plane settled into soft ground and struck a ditch. Post-accident inspection confirmed the engine was functioning normally.

What aircraft was involved and where did it happen?

The accident on 4 Apr 1991 involved a Cessna C172N, registration N737VP, operated by Plymouth Avaition, Inc., at North Liberty, IN.

What was the probable cause of the accident?

The pilot's failure to maintain adequate airspeed and altitude during a low-altitude maneuver over private property, resulting in an inability to arrest the descent despite full power application.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X16754. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.