ASN Wikibase Occurrence # 42664
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Date: | Friday 5 June 1987 |
Time: | 20:15 |
Type: | Bell 206L-1 LongRanger II |
Owner/operator: | Minuteman Aviation |
Registration: | N4999N |
MSN: | 45497 |
Total airframe hrs: | 1297 hours |
Fatalities: | Fatalities: 4 / Occupants: 4 |
Aircraft damage: | Destroyed |
Category: | Accident |
Location: | Choteau, MT -
United States of America
|
Phase: | En route |
Nature: | Unknown |
Departure airport: | Many Glacier, MT |
Destination airport: | Great Falls, MT |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:THE EMS HELICOPTER WAS RETURNING TO GREAT FALLS, MT, ON 6/5/87 WHEN IT CRASHED. ITS OCCUPANTS HAD EARLIER PARTICIPATED IN A RESCUE SEMINAR AT MANY GLACIER, MT. THE WRECKAGE WAS NOT FOUND UNTIL 6/9/87. A VIDEO TAPE RECOVERED FROM THE WRECKAGE DISCLOSED THE HELICOPTER TO BE FOLLOWING A HERD OF BIG HORN SHEEP UP A 7000-FT MOUNTAIN SLOPE AND FLYING SLOWLY AT TREE-TOP LEVEL WHEN IT SUDDENLY YAWED TO THE RIGHT. TESTS MADE ON THE AUDIO PORTION OF THE VIDEO TAPE REVEALED MAIN/TAIL ROTOR RPM WAS AT 100% POWER UNTIL 3.5 SEC BEFORE END OF TAPE. AT THAT TIME MAIN/TAIL ROTOR RPM DROPPED TO 94%. EVIDENCE ALSO DISCLOSED HELICOPTER TO BE FLYING AT HIGH GROSS WEIGHT, HIGH DENSITY ALTITUDE, AND WITH A TAILWIND. CAUSE:
Sources:
NTSB:
http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001213X31161 Revision history:
Date/time | Contributor | Updates |
24-Oct-2008 10:30 |
ASN archive |
Added |
21-Dec-2016 19:24 |
ASN Update Bot |
Updated [Time, Damage, Category, Investigating agency] |
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