ASN Wikibase Occurrence # 298519
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| Date: | Sunday 2 September 2001 |
| Time: | 10:50 LT |
| Type: |  Mcdonnell Douglas 369E |
| Owner/operator: | Omni Aviation Services |
| Registration: | N440TJ |
| MSN: | 0442E |
| Year of manufacture: | 1991 |
| Total airframe hrs: | 8234 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Kemmerer, Wyoming -
 United States of America
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | Kemmerer, WY |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was transporting bags of seismic equipment by long line to a remote site. While he hovered into the wind waiting for a flagger, the helicopter was struck by a wind gust and started turning right. The pilot applied left pedal, but was unable to stop the rotation. The helicopter struck terrain, breaking off both skid legs, tail rotor blades, and tail rotor gearbox. FAA's Advisory Circular 90-95 defines the loss of tail rotor effectiveness as "a critical, low-speed aerodynamic flight characteristic that can result in an uncommanded rapid yaw rate which does not subside of its own accord and, if not corrected, can result in the loss of aircraft control." Some of the conditions conducive to LTE include (1) a high power setting, (2) low airspeed, and (3) a tailwind or left crosswind.
Probable Cause: loss of tail rotor effectiveness while hovering. A contributing factor was the wind gust.
Accident investigation:
 |
|
Sources:
NTSB DEN01LA154
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Oct-2022 18:58 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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