Event SEA91LA028

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

Registry · N316BS

FAA Aircraft Registry record.

Make / Model

DJI T40

0

ADS-B equipped

Yes — Mode-S A35D45

Registrant of record

CONNIE SHARFF LLC

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

N316BS Aerospatiale SA316B Minor

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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