NTSB Probable Cause

INADEQUATE MAINTENANCE AND INSPECTION BY THE OPERATOR WHICH RESULTED IN AN ENGINE POWER LOSS DURING THE CRITICAL TAKEOFF PHASE OF FLIGHT. IN ADDITION, THE PILOT DID NOT, OR WAS UNABLE TO, ATTAIN A FULL-FEATHER POSITION ON THE LEFT ENGINE PROPELLER, WHICH WOULD HAVE MOST LIKELY ENABLED THE AIRPLANE TO SUSTAIN MINIMUM CONTROL AIRSPEED.