Aircraft Runway Excursion Following Nose-Up Trim Malfunction

Casualties unknown • Dayton, OH, US

A pilot was forced to abort a takeoff after an uncommanded nose-up pitch occurred and the electric elevator trim became unresponsive.

What happened

During the takeoff roll, the nose of the aircraft lifted off the ground prematurely. The pilot attempted to correct the pitch by applying electric nose-down trim; however, the controls provided no response. As a result, the aircraft climbed approximately 50 feet above the ground with the pilot unable to lower the nose.

To prevent further complications, the pilot elected to abort the takeoff. During the aborted attempt, the aircraft experienced a hard landing on the runway, veered to the right, and departed the prepared surface. The excursion resulted in the aircraft striking three taxiway lights and one taxiway sign. There were no injuries reported.

The investigation

An examination of the aircraft's electric elevator trim indicator was conducted. Investigators discovered that the indicator had malfunctioned due to a binding guide/lodging pin. This binding caused the indicator to disconnect from its track. Consequently, while the indicator was displaying a full nose-down position, the actual elevator trim tab remained in a full nose-up position.

Probable cause

The malfunction of the electric elevator trim indicator caused by a binding guide pin, which led to a discrepancy between the indicated trim position and the actual position of the trim tab.

Frequently asked questions

What happened in the 1991-09-08 Piper PA46-350P accident near Dayton, OH?

A pilot was forced to abort a takeoff after an uncommanded nose-up pitch occurred and the electric elevator trim became unresponsive.

What aircraft was involved and where did it happen?

The accident on 1991-09-08 involved a Piper PA46-350P, registration N350MM, operated by Arthur F. Lindquist, at Dayton, OH.

What was the probable cause of the accident?

The malfunction of the electric elevator trim indicator caused by a binding guide pin, which led to a discrepancy between the indicated trim position and the actual position of the trim tab.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X18166. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.

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