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Aerobatic Aircraft Departs Controlled Flight During Slow Roll at EAA Convention (N25400)

Oshkosh, WI, US

On August 2, 1990, a Boeing A75N1 (registration N25400) operated by Lewkowicz, John D. was involved in an aviation accident near Oshkosh, WI. Investigators recorded the probable cause as: THE PILOT-IN-COMMAND'S FAILURE TO MAINTAIN AIRSPEED SUFFICIENT TO AVOID A STALL/SPIN AT AN ALTITUDE INSUFFICIENT TO EFFECT A FULL RECOVERY. 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 2026-07-04Data APIEditorial standards

During an aerobatic demonstration at the EAA convention, an aircraft performing a slow roll departed controlled flight at the inverted position, entered an uncommanded snap roll, and descended into terrain.

Maneuver

The aircraft was engaged in performing aerobatic maneuvers in connection with the Experimental Aircraft Association's convention. During the demonstration, the aircraft entered a slow roll to the left.

Loss of Control

At approximately the inverted position of the slow roll, the aircraft departed controlled flight. It then entered an uncommanded snap roll—characterized as a stall/spin—to the left. The aircraft completed three-quarters of a full roll rotation before stopping in a knife-edge flight attitude.

Descent and Impact

Stabilized momentarily in knife-edge flight, the aircraft descended approximately 200 to 300 feet into the terrain.

Loss of control in flightAerodynamic stall

Frequently asked questions

What happened in the 2 Aug 1990 Boeing A75N1 accident near Oshkosh, WI?

During an aerobatic demonstration at the EAA convention, an aircraft performing a slow roll departed controlled flight at the inverted position, entered an uncommanded snap roll, and descended into terrain.

What aircraft was involved and where did it happen?

The accident on 2 Aug 1990 involved a Boeing A75N1, registration N25400, operated by Lewkowicz, John D., at Oshkosh, WI.

What was the probable cause of the accident?

THE PILOT-IN-COMMAND'S FAILURE TO MAINTAIN AIRSPEED SUFFICIENT TO AVOID A STALL/SPIN AT AN ALTITUDE INSUFFICIENT TO EFFECT A FULL RECOVERY.

More accident analyses

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X23929. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.