ASN Wikibase Occurrence # 293116
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| Date: | Friday 2 September 2005 |
| Time: | 12:40 LT |
| Type: |  Aérospatiale SA 315B Lama |
| Owner/operator: | Skydance Northwestern Inc. |
| Registration: | N220SH |
| MSN: | 2466 |
| Year of manufacture: | 1976 |
| Total airframe hrs: | 19658 hours |
| Engine model: | Turbomeca Artouste III |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Duchesne, Utah -
 United States of America
|
| Phase: | Unknown |
| Nature: | Cargo |
| Departure airport: | Duschene, UT |
| Duschene, UT | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During a helicopter external load operation, the pilot was attempting to lift a 1,500 pound drill rig that was attached to the end of a 75-foot long line at a terrain elevation of approximately 7,000 feet msl. As the drill was being lifted off the ground, the helicopter "suddenly [and] violently accelerated (pitched) down [and] left." The pilot attempted to correct the uncommanded movement by applying right aft cyclic; however, the helicopter began a "rapid spin to the left." A ground witness observed the helicopter complete 3 or 4, 360-degree rotations. The pilot then closed the throttle to the flight idle position, and the left rotation stopped. The helicopter entered a descent toward the terrain with approximately 10 knots of forward airspeed. Approximately 30-40 feel above ground level (agl), the pilot pulled the "remaining" collective to slow the descent and rotor RPM. The helicopter's main rotor blades contacted trees, and subsequently the helicopter came to rest on its right side. During the accident sequence, the pilot did not jettison the external load. The pilot reported the wind conditions as "calm" and the temperature 71 degrees Fahrenheit at the time of the accident. Examination of the airframe, systems, and a functional test of the engine revealed no anomalies. The reason for the loss of control was not determined.
Probable Cause: the loss of control during external load operations for undetermined reasons.
Accident investigation:
 |
|
Sources:
NTSB DEN05LA131
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Oct-2022 16:14 | ASN Update Bot | Added |
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