Incident Description
During the landing approach, the pilot moved the power levers to reduce power, but the right engine remained at a high power setting. The pilot executed a missed approach and experienced difficulty maintaining straight and level flight. He then maneuvered for a second approach and landed. After touchdown, the pilot could not maintain directional control of the airplane and attempted a go-around. The aircraft departed the end of the runway and struck the localizer antenna. The pilot did not advise air traffic control of the problem nor declare an emergency.
Maintenance Background
Approximately one month before the incident, maintenance had been performed on the right engine to correct a discrepancy regarding a stiff right engine power lever. During that maintenance, the mechanic re-rigged the right engine power cable.
Power Control Cable Condition
Following the incident, the power control cable was found disconnected from its anchoring point. A safety tab was broken off the housing, which allowed the housing to unscrew.
Pilot's Operating Handbook Guidance
The Pilot's Operating Handbook stated that in the event of a power plant control malfunction, the affected engine should be shut down and a single-engine landing should be made.