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Naperville, IL
PLT STATED ENG HAD BEEN 'RUNNING ROUGH' SINCE 100 HR INSPECTION. ENG HAD 130 HRS TOTAL TIME. ON RUN-UP, ENG WAS MISFIRING UNTIL PLT LEANED MIXTURE AND ALLOWED FULL WARM UP. ENG THEN PERFORMED NORMALLY. TAKEOFF AND CLIMB TO CRUISE UNEVENTFUL. AFTER ABOUT 45 MIN FLT, ENG RPM DROPPED. PLT INITIATED CORRECTIVE PROCEDURES, INCLUDING SWITCHING FUEL TANKS AND RESTORED PWR MOMENTARILY. ENG THEN BEGAN MISFIRING/BACKFIRING. PLT ATTEMPTED CORRECTIVE PROCEDURES BUT ENG LOST TOTAL POWER. PLT EXECUTED FORCED LANDING IN FOOTBALL FIELD. ON POST-MISHAP ENG RUN-UP, ENG PERFORMED NORMALLY.
PLT STATED ENG HAD BEEN 'RUNNING ROUGH' SINCE 100 HR INSPECTION. ENG HAD 130 HRS TOTAL TIME. ON RUN-UP, ENG WAS MISFIRING UNTIL PLT LEANED MIXTURE AND ALLOWED FULL WARM UP. ENG THEN PERFORMED NORMALLY. TAKEOFF AND CLIMB TO CRUISE UNEVENTFUL. AFTER ABOUT 45 MIN FLT, ENG RPM DROPPED. PLT INITIATED CORRECTIVE PROCEDURES, INCLUDING SWITCHING FUEL TANKS AND RESTORED PWR MOMENTARILY. ENG THEN BEGAN MISFIRING/BACKFIRING. PLT ATTEMPTED CORRECTIVE PROCEDURES BUT ENG LOST TOTAL POWER. PLT EXECUTED FORCED LANDING IN FOOTBALL FIELD. ON POST-MISHAP ENG RUN-UP, ENG PERFORMED NORMALLY.