ASN Wikibase Occurrence # 384372
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Date: | Sunday 16 May 1982 |
Time: | 18:30 LT |
Type: | Enstrom F-28C |
Owner/operator: | Douglas Duffield |
Registration: | N8617J |
MSN: | 516-2 |
Year of manufacture: | 1981 |
Total airframe hrs: | 483 hours |
Engine model: | Lycoming HIO-360-E1BD |
Fatalities: | Fatalities: 0 / Occupants: 1 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | Marmath, ND -
United States of America
|
Phase: | En route |
Nature: | Training |
Departure airport: | Baker, MT (3U6) |
Destination airport: | Ellis, WI |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:THE PILOT REPORTED THAT WHILE HE WAS IN FLIGHT AT ABOUT 75 TO 80 FT AGL, THE ENGINE LOST POWER. DURING AN AUTOROTATIVE LANDING IN AN OPEN PASTURE, A SKID DUG INTO THE GROUND AND THE HELICOPTER ROLLED OVER. A SUBSEQUENT ENGINE TEARDOWN REVEALED EVIDENCE THAT THE ENGINE HAD BEEN OPERATED IN AN OVERSPEED CONDITION OVER A PROLONGED PERIOD OF TIME. THERE WAS EVIDENCE OF HIGH VALVE SEATING VELOCITIES AND BOUNCING, THE UPPER SPRING SEATS HAD BEEN STRIKING THE TOPS OF THE VALVE GUIDES, FATIGUE FAILURE OF THE KEEPERS HAD OCCURRED, AND SUBSEQUENTLY, A VALVE FAILED FROM FATIGUE.
Probable Cause:
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | DEN82DA089 |
Status: | Investigation completed |
Duration: | 1 year |
Download report: | Final report |
|
Sources:
NTSB DEN82DA089
Revision history:
Date/time | Contributor | Updates |
03-Apr-2024 10:29 |
ASN Update Bot |
Added |
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