On September 14, 1985, a Bell 206BII (registration N58012) was involved in an aviation accident near Atlanta, ID. Investigators recorded the probable cause as: A split 'O' ring on the governor of the py orifice, which caused a partial power loss, and the left skid striking a rock during touchdown. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A helicopter experienced a power loss shortly before touchdown, leading to a skid striking a rock and causing the aircraft to roll onto its side.
What happened
The accident occurred during the landing phase of flight. The pilot reported experiencing a loss of power shortly before touchdown. As the aircraft touched down, the left skid struck a rock on the ground. This impact caused the helicopter to roll onto its right side.
The investigation
Examination of the aircraft revealed mechanical issues that contributed to the incident. Investigators discovered a split 'O' ring on the governor of the py orifice. This defect could account for the partial power loss observed prior to touchdown.
Additionally, maintenance records indicated that a similar situation had occurred twenty-five flight hours earlier. During that previous event, a loose air line to the fuel control was found, although no specific reason for the power loss at that time was determined.
Probable cause
A split 'O' ring on the governor of the py orifice, which caused a partial power loss, and the left skid striking a rock during touchdown.
Frequently asked questions
What happened in the 14 Sept 1985 Bell 206BII accident near Atlanta, ID?
A helicopter experienced a power loss shortly before touchdown, leading to a skid striking a rock and causing the aircraft to roll onto its side.
What aircraft was involved and where did it happen?
The accident on 14 Sept 1985 involved a Bell 206BII, registration N58012, at Atlanta, ID.
What was the probable cause of the accident?
A split 'O' ring on the governor of the py orifice, which caused a partial power loss, and the left skid striking a rock during touchdown.
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