ASN Wikibase Occurrence # 298109
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| Date: | Friday 13 October 2017 |
| Time: | 09:15 LT |
| Type: |  Bell (Williams Helicopter) UH-1H Iroquois |
| Owner/operator: | |
| Registration: | N247PV |
| MSN: | 65-9649 |
| Year of manufacture: | 1965 |
| Engine model: | Lycoming T53-L-13 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Arbuckle, California -
 United States of America
|
| Phase: | Landing |
| Nature: | Ferry/positioning |
| Departure airport: | Arbuckle, CA |
| Arbuckle, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot and mechanic reported that, before the accident, the mechanic had adjusted the helicopter's main rotor track and balance. After the mechanic made the final adjustments, the pilot hovered the helicopter to a wash rack for cleaning. Subsequently, while the pilot was repositioning the helicopter to a nearby landing cart and just as the front portions of the skids were over the cart, the collective began to oscillate, followed by the skids striking the cart. The pilot attempted to land the helicopter as it continued to oscillate, but the right skid slid off the cart. The helicopter then rolled onto its right side and impacted the ground.
The mechanic reported that all components prior to the accident were in good working order and that the track and balance adjustments had resulted in satisfactory monitoring equipment readings prior to the accident.
Examination of the helicopter did not reveal evidence of any preaccident malfunctions or failures that would have precluded normal operation. The reason for the oscillations could not be determined based on the available information.
Probable Cause: A collective control malfunction for reasons that could not be determined.
Accident investigation:
 |
|
Sources:
NTSB WPR18LA004
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Oct-2022 13:09 | ASN Update Bot | Added |
| 22-Jun-2023 17:58 | harro | Updated |
Corrections or additions? ... Edit this accident description
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