THE PLT & A PROSPECTIVE BUYER/PASSENGER WERE ON A LOCAL DEMONSTRATION FLT. PRIOR TO THIS FLT, THE ACFT HAD BEEN PARKED FOR NEARLY 1 YR. SINCE THE LAST ANNUAL INSPECTION ON 1/12/82, IT HAD BEEN FLOWN ONLY 66 HRS. DURING THE PREFLT, THE PLT FOUND THE FUEL TANKS BETWEEN 1/4 FULL & EMPTY. THE SUMPS WERE DRAINED, THE MAIN TANKS WERE FILLED, THEN THE SUMPS WERE DRAINED AGAIN. AFTER TAKEOFF, THE PLT LEVELED THE ACFT AT 1500 FT IN A CRUISE CONFIGURATION. SHORTLY THEREAFTER, THE LEFT ENG BEGAN RUNNING ROUGH, BACKFIRING & LOSING POWER. THE PLT TURNED BACK TOWARD THE ARPT, BUT THE ENG LOST ALL POWER & THE PROP WAS FEATHERED. WHILE RETURNING, THE RIGHT ENG'S CYLINDER HEAD & OIL TEMP BEGAN RISING ABOVE THE RED LINE. SUBSEQUENTLY, IT BEGAN LOSING POWER & A WHEELS-UP, FORCED LANDING WAS MADE IN AN OPEN FIELD. AN EXAM REVEALED THAT BOTH ENGS WERE OUT OF TIME, FIRING WAS INTERMITTENT 1 DISTRIBUTOR BLOCK ON THE LEFT ENG WAS BURNEDDUE TO INCORRECT TIMING. ALSO, THE LEFT TURBOCHARGER GATE WAS STUCK OPEN & THE LEFT FUEL FILTER WAS PARTIALLY CLOGGED.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

Contributing Factors

WHEELS UP LANDING..PERFORMED..PILOT IN COMMAND

Contributing Factors

IGNITION SYSTEM,MAGNETO..INCORRECT

Contributing Factors

MAINTENANCE,ADJUSTMENT..IMPROPER..OTHER MAINTENANCE PERSONNEL

Contributing Factors

IGNITION SYSTEM,DISTRIBUTOR..ARCING

Contributing Factors

FUEL SYSTEM,FILTER..BLOCKED(PARTIAL)

Contributing Factors

MAINTENANCE,INSPECTION..INADEQUATE..OTHER MAINTENANCE PERSONNEL

Contributing Factors

FLUID,FUEL..STARVATION

Contributing Factors

EXHAUST SYSTEM,TURBOCHARGER..BINDING(MECHANICAL)

Contributing Factors

AIRCRAFT PERFORMANCE,TWO OR MORE ENGINES..FAILURE,PARTIAL

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