Narrative:

Weather was cavu in VFR conditions. After approximately 15 minutes flight at cruise altitude of 3;500'; aircraft engine began running rough and losing power. Pilot adjusted power; mixture and prop settings with no positive effect. Pilot then elected to land and chose a grass field 3/4 mile ahead of current position. Pilot lowered gear and full flaps and set up for southwest to northeast straight-in landing in field as engine was now unable to provide power enough to maintain altitude. [We advised] approach. Plane continued through 1250' msl at which time engine stopped completely. Pilot was able to maintain controlled glide and conduct a soft field landing in chosen field. Ground roll after touchdown to full stop was approximately 1500'. Inspection revealed no damage to aircraft or property; and no injuries resulted to pilot or passenger. Emergency personnel were notified by telephone of successful landing. Mechanic contacted and arrived an hour later to inspect plane. With landowner's permission; aircraft was left in field overnight for an attempted recovery the next day.the next day; after inspection by mechanic and pilot; 100 gallons of avgas was added to the right fuel tank of the aircraft and allowed to equalize with the left tank via gravity feed. Engine was then started and a run-up was conducted by the pilot and the mechanic. No anomalies were noted. Pilot back taxied onto adjacent asphalt county road with approximately 2500' available length for takeoff. A short field takeoff (25 deg flaps) was achieved with aircraft reaching V1 after 1000' roll with continued climb vx to 1200' agl and vy climb to 4500'. Gear was left in down position and plane was flown back to [home base]; where it landed and then taxied to mechanic's hangar for inspection.aircraft will undergo further inspection by mechanic. Mechanic will change all 18 spark plugs; replace electric fuel pump; and troubleshoot electric fuel gauges. Gauges at the time of landing in field showed 100 lbs fuel in left tank and 650 lbs fuel in right tank.

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Original NASA ASRS Text

Title: Trojan (T28) pilot and passenger (pilot) reported landing in a field after the engine lost power in cruise flight. Fuel was added after the forced landing; and no anomalies were noted with the engine.

Narrative: Weather was CAVU in VFR conditions. After approximately 15 minutes flight at cruise altitude of 3;500'; aircraft engine began running rough and losing power. Pilot adjusted power; mixture and prop settings with no positive effect. Pilot then elected to land and chose a grass field 3/4 mile ahead of current position. Pilot lowered gear and full flaps and set up for SW to NE straight-in landing in field as engine was now unable to provide power enough to maintain altitude. [We advised] Approach. Plane continued through 1250' msl at which time engine stopped completely. Pilot was able to maintain controlled glide and conduct a soft field landing in chosen field. Ground roll after touchdown to full stop was approximately 1500'. Inspection revealed no damage to aircraft or property; and no injuries resulted to Pilot or Passenger. Emergency personnel were notified by telephone of successful landing. Mechanic contacted and arrived an hour later to inspect plane. With landowner's permission; aircraft was left in field overnight for an attempted recovery the next day.The next day; after inspection by mechanic and pilot; 100 gallons of avgas was added to the right fuel tank of the aircraft and allowed to equalize with the left tank via gravity feed. Engine was then started and a run-up was conducted by the pilot and the mechanic. No anomalies were noted. Pilot back taxied onto adjacent asphalt county road with approximately 2500' available length for takeoff. A short field takeoff (25 deg flaps) was achieved with aircraft reaching V1 after 1000' roll with continued climb Vx to 1200' agl and Vy climb to 4500'. Gear was left in down position and plane was flown back to [home base]; where it landed and then taxied to mechanic's hangar for inspection.Aircraft will undergo further inspection by mechanic. Mechanic will change all 18 spark plugs; replace electric fuel pump; and troubleshoot electric fuel gauges. Gauges at the time of landing in field showed 100 lbs fuel in left tank and 650 lbs fuel in right tank.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.