Accident Overview
A helicopter experienced a loss of engine power during flight, prompting the pilot to initiate an autorotation. The pilot reported that he observed normal power indications and therefore pulled collective. Subsequently, the helicopter impacted a roadway.
Post-Accident Examination
Following the accident, a detailed examination of the helicopter was conducted. The inspection disclosed that the flexible air duct, located between the air filter box and the turbocharger inlet, had become disconnected and had collapsed. Additionally, the clamp that secures the air duct to the air filter box was found to be loose and had slipped off its intended position.
Findings
The examination identified two specific conditions: the disconnection and collapse of the flexible air duct, and the loosened clamp. These findings are documented as part of the post-accident analysis. No further details regarding the circumstances leading to the disconnection or the clamp condition are provided in the source material.