ASN Wikibase Occurrence # 284581
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| Date: | Monday 16 July 2007 |
| Time: | 07:30 LT |
| Type: |  Bell 206B II |
| Owner/operator: | Private |
| Registration: | N164JS |
| MSN: | 955 |
| Year of manufacture: | 1973 |
| Total airframe hrs: | 5043 hours |
| Engine model: | Allison 250C20 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Sheep Mountain, Montana -
 United States of America
|
| Phase: | Unknown |
| Nature: | Cargo |
| Departure airport: | Mtn Drop Site, MT |
| Mtn Drop Site, MT | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter was transporting supplies with a cargo net from one mountain site to another. The sling loads consisted of steel angle iron, which was bagged and secured with velcro, and then placed into the cargo net. After delivering the fourth load, the pilot lifted off with only an empty bag inside the net. The Bell 206B rotorcraft flight manual, in the supplement for external loading, states, "Control movements should be made smoothly and kept to a minimum to prevent oscillation of sling load." According to a witness, as the helicopter departed, the net "floated very close to the propeller [tail rotor], then floated back down." The net, which was attached directly to the helicopter cargo hook without the use of a long line, swung back up again and impacted the tail rotor, cutting the cargo net and releasing the bag. The pilot heard noise and "thumping" sounds, accompanied by vibrations and yawing, and realized that he had a tail rotor strike. The pilot entered an autorotation at "25 miles per hour and 200 feet" above a timbered slope. The pilot selected a small, sloped, clearing as a landing zone, and upon touchdown, the helicopter rolled over, coming to rest on it's right side.
Probable Cause: The external load net, attached directly to the cargo hook without the use of a long line, oscillated and made contact with the tail rotor system while maneuvering.
Accident investigation:
 |
|
Sources:
NTSB SEA07CA200
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Sep-2022 18:55 | ASN Update Bot | Added |
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