Casualties unknown

1991-05-31: Cessna 140 (N4090N) — Paul And Brian Keehan — Depere, WI

Depere, WI, US

On May 31, 1991, a Cessna 140 (registration N4090N) operated by Paul And Brian Keehan was involved in an aviation accident near Depere, WI. Investigators recorded the probable cause as: THE PILOT'S FAILURE TO CORRECT A MUSHED STALL DURING LIFTOFF. A FACTOR IN THE ACCIDENT WAS THE PILOT'S FAILURE TO COMPENSATE FOR WIND CONDITIONS. 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 1781061362Data APIEditorial standards

A private pilot making a downwind takeoff from a sod strip reported the airplane wanting to roll right. The passenger observed alternating wing drops. The airplane mushed into the ground 300 feet beyond the runway. No malfunction was found.

Takeoff and Initial Climb

A private pilot initiated a downwind takeoff from a 2000-foot sod runway. The airplane climbed to treetop height. According to the pilot, the airplane exhibited a tendency to roll off to the right, requiring continuous control inputs to maintain straight and level flight.

Passenger Observations

The passenger described the wings dropping alternately—first one side, then the other. This motion was consistent with a loss of lateral control during the climb.

Descent and Impact

The airplane mushed into the ground approximately 300 feet beyond the departure end of the runway. The term "mush" indicates a stalled or near-stalled flight condition with insufficient lift.

Post-Event Examination

No malfunction of the airplane was reported by the pilot or discovered during subsequent inspection. The airplane's systems and structure were found to be operating normally.

Pilot Statement

The pilot stated that he had to "fight" the airplane to keep it straight and level, suggesting significant control difficulty during the takeoff and initial climb phase.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X16969. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.