ASN Wikibase Occurrence # 279471
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| Date: | Friday 17 June 2022 |
| Time: | 06:15 |
| Type: |  Bell 206B JetRanger II |
| Owner/operator: | Alpine Helicopter Services Inc |
| Registration: | N90326 |
| MSN: | 1764 |
| Year of manufacture: | 1975 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Stockton, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | Lodi, CA |
| Stockton, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot had departed his home base to relocate the helicopter for an upcoming aerial application job when he felt a vibration and heard a bang, followed immediately by an uncommanded right yaw. While performing a precautionary landing to an orchard, the helicopter entered an uncommanded, continuous right rotation about the vertical axis. The pilot rolled off the throttle and increased collective to cushion the landing, but the helicopter continued the right rotation as it touched down, which resulted in the helicopter rolling over onto its left side.
The helicopter sustained substantial damage to the fuselage, transmission, main rotor, and tail rotor assemblies. Fragments of one tail rotor blade was recovered about 2,000 ft from the main wreckage. The pilot stated that he was unsure if a bird had struck the tail rotor during flight. Postaccident examination of the tail rotor assembly revealed both blades were damaged, and one blade fractured and separated from the hub.
The tail rotor blades were shipped to the National Transportation Safety Board (NTSB) materials laboratory, and subsequently to the manufacturer’s laboratory for further examination. The combined examinations revealed translaminar overstress fractures of both tail rotor blades, with one blade exhibiting a leading-edge high-energy impact. Both blades exhibited an unidentified foreign material transfer onto their leading edges. A small amount of nitrile rubber was found lodged into the end of one blade; however, its origin was undetermined.
Probable Cause: Tail rotor blade impact with an unidentified object, which resulted in the loss of control and subsequent rollover of the helicopter.
Accident investigation:
 |
|
Sources:
NTSB
https://data.ntsb.gov/Docket?ProjectID=105297
Location
Images:
Photo: NTSB
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Jun-2022 20:42 | Captain Adam | Added |
| 20-Apr-2024 20:50 | Captain Adam | Updated [Time, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report, Photo] |
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