ASN Wikibase Occurrence # 285496
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| Date: | Thursday 30 October 2008 |
| Time: | 07:40 LT |
| Type: |  Hiller UH-12E |
| Owner/operator: | Wyoming Air Corp |
| Registration: | N61436 |
| MSN: | 5017 |
| Total airframe hrs: | 4115 hours |
| Engine model: | Lycoming VO-540 SER |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Powder River, Wyoming -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Survey |
| Departure airport: | Powder River, WY |
| Powder River, WY | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While maneuvering about 50 feet above ground level during an aerial observation flight, one blade associated with the control rotor assembly separated from the helicopter, and a violent vibration started. Unable to maintain control, the pilot made a forced landing on the underlying sloping terrain, and the helicopter rolled over. During the subsequent inspection of the rotor system, one of the two control rotor blade assemblies was found separated from the rotor head. A rotor blade control tube had cracked and broken off outboard of the two attachment bolts. The component had been operated 21 hours since receiving its last inspection. The reason for the cracking and separation of the control tube could not be determined.
Probable Cause: A flight control system malfunction while the helicopter was maneuvering at low altitude due to the failure/separation of the rotor blade control tube.
Accident investigation:
 |
|
Sources:
NTSB WPR09LA028
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 02-Oct-2022 10:34 | ASN Update Bot | Added |
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