ASN Wikibase Occurrence # 292186
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| Date: | Thursday 15 June 2006 |
| Time: | 16:15 LT |
| Type: |  Bell 206L |
| Owner/operator: | Silver State Helicopters |
| Registration: | N265SH |
| MSN: | 51447 |
| Year of manufacture: | 1991 |
| Total airframe hrs: | 5227 hours |
| Engine model: | Lycoming 250-C30P |
| Fatalities: | Fatalities: 0 / Occupants: 6 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Vernal, Utah -
 United States of America
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | Vernal, UT |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Prior to takeoff in conditions that resulted in a density altitude of over 10,000 feet, the pilot figured his takeoff/hover performance using the Hover Ceiling In Ground Effect chart, which indicated the helicopter could safely depart the landing zone (LZ). Because he was taking off over uneven, sloping, brush-covered terrain, he should have used the Hover Ceiling Out of Ground Effect chart, which indicated the helicopter did not have the performance to safely depart the LZ. After liftoff, the pilot started moving the aircraft forward, but it could not out-climb the up-sloping terrain, so he elected to make a precautionary landing on a nearby road. During the landing attempt, the helicopter's tail rotor lost its effectiveness, and the aircraft spun around once and descended into the terrain.
Probable Cause: The loss of tail rotor effectiveness during an attempted precationary landing after a takeoff over uneven, sloping, brush-covered terrain. Factors include the pilot using the wrong performance chart while completing his preflight performance calculations, the uneven, sloping, brush-covered terrain, and a high density altitude.
Accident investigation:
 |
|
Sources:
NTSB SEA06LA121
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Oct-2022 15:32 | ASN Update Bot | Added |
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