Casualties unknown

Helicopter rollover during wind effect demonstration (N10415)

Lakeville, MN, US

On March 29, 1986, a Hughes 269A (TH-55A) (registration N10415) was involved in an aviation accident near Lakeville, MN. Investigators recorded the probable cause as: The pilot's failure to maintain altitude during a maneuver in strong gusty winds, which resulted in the helicopter contacting the terrain with its right skid and rolling over. 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 2026-06-10Data APIEditorial standards

A helicopter descended and rolled over after contacting the terrain with its right skid while demonstrating wind effects during turns around a point in strong gusty winds.

What happened

The accident occurred while a certified flight instructor (CFI) was conducting a demonstration of wind effect management during turns around a point. The helicopter was operating at an approximate altitude of 200 feet above ground level (AGL). As the aircraft was turned downwind, it began to descend unexpectedly. The descent continued until the right skid made contact with the terrain, causing the helicopter to roll over.

The investigation

Post-accident examination confirmed that the right skid had contacted the ground during the maneuver. No mechanical failures or pre-accident anomalies were reported that would have prevented normal operation of the aircraft systems.

Findings

The primary contributing factor was the strong, gusty winds present at the time of the accident. These conditions likely exceeded the helicopter's performance capabilities during the low-altitude maneuver, leading to an uncontrolled descent and subsequent rollover. The pilot's decision to continue the demonstration in such weather conditions played a significant role in the outcome.

Safety message

Pilots should exercise extreme caution when performing maneuvers around a point in strong gusty winds. Low-altitude operations require precise control inputs and adequate energy management, particularly when transitioning from upwind to downwind headings where wind shear effects can be pronounced.

Probable cause

The pilot's failure to maintain altitude during a maneuver in strong gusty winds, which resulted in the helicopter contacting the terrain with its right skid and rolling over.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X33011. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.