ASN Wikibase Occurrence # 22710
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| Date: | Tuesday 9 August 1994 |
| Time: | 13:30 LT |
| Type: |  Bell 206B JetRanger |
| Owner/operator: | Oney, Anthony L |
| Registration: | N4604Y |
| MSN: | 556 |
| Year of manufacture: | 1970 |
| Engine model: | ALLISON 250-C20 |
| Fatalities: | Fatalities: 0 / Occupants: 5 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Chuit River, near Tyonek, Alaksa -
 United States of America
|
| Phase: | Taxi |
| Nature: | Executive |
| Departure airport: | Anchorage, AK (LHD) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT LANDED ON A GRAVEL BAR IN A RIVER WHICH HAD HIGH BANKS. THE WIND WAS VARIABLE DURING THE APPROACH AND LANDING. HE 'PICKED' THE HELICOPTER BACK UP TO A HOVER TO REPOSITION ON THE GRAVEL BAR AND THE HELICOPTER BEGAN TO TURN TO THE RIGHT. HE APPLIED LEFT PEDAL, FELT A RESPONSE, BUT WAS UNABLE TO STOP THE TURN. DURING THE TURN THE HELICOPTER DESCENDED AND STRUCK THE WATER. AFTER EVERYONE EXITED THE HELICOPTER, IT ROLLED OVER AND SANK IN THE RIVER. ACCORDING TO THE MANUFACTURER AND THE FAA, WHEN A HELICOPTER IS OPERATING AT OR NEAR ITS MAXIMUM GROSS WEIGHT, TAIL ROTOR CONTROL MAY BECOME MARGINAL DEPENDING ON WIND CONDITIONS. HOVERING WITH A TAILWIND MAY CAUSE TEMPORARY LOSS OF TAIL ROTOR EFFECTIVENESS AND ALLOW THE HELICOPTER TO ROTATE ABOUT ITS VERTICAL AXIS. THE PURPOSE OF THE FLIGHT WAS FISH GUIDING.
Probable Cause: THE PILOT'S FAILURE TO MAINTAIN TAIL ROTOR EFFECTIVENESS DURING HOVER.
Accident investigation:
 |
|
Sources:
NTSB ANC94LA103
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=4604Y
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Sep-2008 10:48 | Vaclav Kudela | Added |
| 30-May-2016 12:58 | Dr.John Smith | Updated [Time, Total fatalities, Total occupants, Other fatalities, Location, Nature, Departure airport, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:14 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 21-Dec-2016 19:16 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 21-Dec-2016 19:20 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 10-Apr-2024 05:26 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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