Accident Summary
The flight instructor (CFI) reported that during the initial climb and following landing gear retraction, the left engine lost power. The CFI assumed control, feathered the left propeller, but was unable to establish a positive single-engine rate of climb. While attempting to fly through a low point in hilly terrain, the airplane collided with a power line and subsequently crashed into a ravine.
Witness and Physical Evidence
A ground witness observed the landing gear in the extended position during the flight, and post-accident examination confirmed the landing gear was found in the extended and locked position. A pilot-rated passenger seated in the rear reported hearing the stall horn sounding after the CFI took control and attempted to establish a single-engine climb.
Mechanical Findings
Examination of the left engine revealed that the fuel flow divider was partially plugged with a grey/white material, identified as contamination. Laboratory analysis identified the material as polyethylene terephthalate (PET), a thermoplastic. The origin of the contaminant remains unknown.
Performance Considerations
According to the aircraft's single-engine performance chart, the airplane should have been capable of a climb rate of approximately 150 feet per minute under the conditions. The published single-engine best rate of climb speed (Vyse) is 103 mph, and the stall speed in landing configuration (Vso) is 73 mph.