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Atlas / NTSB / SEA85LA060

NTSB CAROL · Event

Event SEA85LA060

1985-02-18 LOWELL, Oregon, United States Minor 1 aircraft Status: Completed

Aircraft involved

Factual narrative

THE ACFT COLLIDED WITH HILLY TERRAIN DURING AN EMERGENCY AUTOROTATION LANDING ATTEMPT FOLLOWING A REPORTED ENG OVERSPEED. THE CREW REPORTED THERE WAS AN INDICATION OF ENG OVERSPEED WHICH THEY COULD NOT CONTROL. POST ACC EXAMINATIONREVEALED NO EVIDENCE OF OVERSPEED OR FAILURE OF ANY CONTROL DEVICES THAT WOULD MATERIALLY HAVE AFFECTED THE FLT CREWS ABILITY TO MAINTAIN ENG RPM AT THE PROPER AND/OR DESIRED RATE. ROTOR RPM DECAY WAS ALSO REPORTED BY THE FLT CREW EVEN WITH THE ENG AT THE REPORTED HIGH RPM. NO REASON FOR THE ALLEGED CONDITION WAS FOUND IN CONTINUITY OF THE PWR TRAIN IN AN EXAMINATION OF THE POWERPLANT & DRIVE TRAIN AFTER ENG SHUT DOWN BY GROUND PERSONNEL. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12

Verbatim from NTSB's published report. Source file NTSB_1985_SEA85LA060.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.