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SEA91LA028

1990-12-03 · VERNAL, Utah, United States · Minor · 1 aircraft · Status: Completed

N316BS has since been reassigned. It is now registered to a different aircraft (DJI T40), which was not involved in this event.

Aircraft involved

Probable cause & findings

A MALFUNCTION/FAILURE OF THE HELICOPTER'S MAIN ROTOR LEAD-LAG DAMPER.

Factual narrative

THE ACFT DEVELOPED VIBRATIONS IN FLT WITH SEVERE FEEDBACK THROUGH THE CONTROL SYSTEM TO THE CYCLIC STICK. THE PILOT INITIATED AN EMERGENCY LANDING AND LOST CONTROL JUST BEFORE TOUCHDOWN. THE ACFT IMPACTED THE GROUND WHILE SPINNING AND ROLLED OVER. EVIDENCE INDICATED A MALFUNCTION/FAILURE OF A MAIN ROTOR DAMPER. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12

Verbatim from NTSB's published report. Source file NTSB_1990_SEA91LA028.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

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