Casualties unknown

2000-06-29: Air Tractor AT-502 (N91891) — Portland, ND

Portland, ND, US

On June 29, 2000, an Air Tractor AT-502 (registration N91891) was involved in an aviation accident near Portland, ND. Investigators recorded the probable cause as: The pilot's decision to attempt flight after sustaining damage to the left wing and aileron from a road sign during a forced landing, which resulted in loss of control. 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

After an engine failure forced a landing on a road, the pilot restarted the engine and attempted a takeoff from the same surface. The aircraft rolled left immediately after becoming airborne, resulting in a crash into terrain.

What happened

The pilot was operating a private flight when the engine experienced a sudden loss of power. Unable to maintain altitude, the pilot executed a forced landing on a nearby road. During this initial touchdown, the leading edge of the left wing and the left aileron sustained damage after striking a road sign.

Despite the structural damage, the pilot managed to restart the engine while still on the ground. Deciding against abandoning the aircraft, he attempted to take off from the road surface to return to his private airstrip. Once the airplane became airborne, it began to roll sharply to the left. The pilot applied right aileron control input in an attempt to counteract the roll, but the aircraft continued its descent until it contacted the terrain.

The investigation

Examination of the aircraft revealed significant damage to the left wing structure. Specifically, the leading edge of the left wing and the left aileron were compromised due to contact with a road sign during the initial forced landing. This impact likely altered the aerodynamic profile of the left wing, contributing to the asymmetric lift experienced during the subsequent takeoff attempt.

Findings

The sequence of events indicates that the initial engine failure was not the sole cause of the accident. The damage sustained from hitting the road sign during the forced landing critically affected the aircraft's controllability. When the pilot attempted to fly away from the road, the damaged left wing could not generate sufficient lift or respond correctly to control inputs, leading to an unrecoverable roll.

  • Engine failure occurred prior to the forced landing.
  • Left wing damage resulted from contact with a road sign.
  • Loss of control happened during the takeoff phase after the engine was restarted.
  • The pilot's decision to fly the damaged aircraft likely contributed to the final impact.

Probable cause

The pilot's decision to attempt flight after sustaining damage to the left wing and aileron from a road sign during a forced landing, which resulted in loss of control.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X21191. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.