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 |
| Engine model: | ALLISON 250-C28B |
| 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 |
| Great Falls, MT | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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] |
Corrections or additions? ... Edit this accident description
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