Incident Summary
The flight proceeded without incident until the approach to land at the destination airport. As the pilot reduced engine power for the approach, the engine lost power and the throttle would not respond. The pilot informed the control tower of the power loss and prepared for an emergency landing. During the landing attempt, the airplane clipped a tree top and went through a power line before touching down on the ground. The airplane landed hard, causing the nose gear to collapse. The left wing also collided with a light pole.
Examination Findings
Post-accident examination of the airplane revealed damage to the left and right wings, including spar and wing skin damage. Examination of the engine identified that the throttle cable had separated from the throttle body arm. The throttle cable attaching bolt remained attached to the throttle body arm, but the nut was missing. Additionally, the bolt was not drilled for a cotter key.
Compliance Issues
Further review disclosed that Airworthiness Directive 86-24-07 and Cessna Information Letter SE79-6 had not been complied with during the recent installation of the engine assembly, which was performed during the annual inspection.