ASN Wikibase Occurrence # 291897
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| Date: | Saturday 19 August 2006 |
| Time: | 10:55 LT |
| Type: |  Bell 407 |
| Owner/operator: | Silver State Helicopters |
| Registration: | N407SH |
| MSN: | 53045 |
| Year of manufacture: | 1996 |
| Engine model: | Rolls-Royce 250 C47B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Havre, Montana -
 United States of America
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | Havre City County Airport, MT (HVR/KHVR) |
| Havre, UT | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot, who was approaching an area where he was going to place a long-line load onto the terrain, inadvertently allowed the helicopter to enter into a vortex ring state (settling with power) condition, resulting in his inability to keep the helicopter from descending at a rate that resulted in it hitting the ground and bouncing back into the air. At the point in time when it contacted the ground with its skids, the helicopter's tail rotor impacted a portion of the rigging for the load that it had been hauling, which resulted in substantial damage to the tail rotor and the tail rotor drive shaft.
Probable Cause: The pilot inadvertently allowing the helicopter to enter into a vortex ring state (settling with power) condition while he was lowering a long-line load to the ground, resulting in the helicopter settling to the ground and its tail rotor impacting part of the rigging used to haul the load. Factors include the long-line load and its rigging sitting on the ground at the point where the helicopter settled to the terrain.
Accident investigation:
 |
|
Sources:
NTSB SEA06CA165
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Oct-2022 06:30 | ASN Update Bot | Added |
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