Accident Details
A helicopter experienced a loss of engine power shortly after takeoff from the summit of Pikes Peak. The pilot executed an autorotation straight ahead, but the aircraft collided with trees and subsequently rolled over.
Post-Accident Examination
Fuel samples taken after the accident were found to contain visible contaminants. Laboratory analysis identified the contaminants as filter material and particles of metal, glass, sand, and plastic. The metallic particles were composed of copper, iron, nickel, and chromium.
During post-accident testing, the fuel control unit (FCU) was unable to attain the target fuel flow. Disassembly of the FCU revealed a clogged amplifier piston filter, a scored isochronous piston, and a collapsed temperature compensator.
Manufacturer Assessment
According to the engine manufacturer, the presence of fuel contaminants could disturb FCU operation. The manufacturer further stated that the scored piston was "evidence of an operation with polluted fuel."
Origin of Contaminants
The source of the contaminants was not determined. No reports of fuel contamination were received from other pilots who used the same fuel vendor.