What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
The aircraft was being used by a student pilot and CFI for a cross country flight. The outbound portion of the flight was completed without incident. While enroute to the airport they had originated from they were instructed to descend and maintain 2500 feet MSL. The descent checklist was completed and they initiated and completed the descent as instructed. About 15 miles from the airport, sudden engine roughness with substantial loss of RPM was encountered. They observed that the cylinder head temperatures for cylinders 1 and 4 had dropped rapidly. They began to circle while executing the engine power loss in-flight checklist. There was no improvement in engine performance. They could not maintain altitude.
The CFI decided to execute a forced landing. He selected a suitable field for landing. The aircraft landed safely and the CFI secured the aircraft. There were no injuries and no damage to the aircraft or property.
As the FAA filed it
THE AIRCRAFT WAS BEING USED BY A STUDENT PILOT AND CFI FOR A CROSS COUNTRY FLIGHT. THE OUTBOUND PORTION OF THE FLIGHT WAS COMPLETED WITHOUT INCIDENT. WHILE ENROUTE TO THE AIRPORT THEY HAD ORIGINATED FROM THEY WERE INSTRUCTED TO DESCEND AND MAINTAIN 2500 FEET MSL. THE DESCENT CHECKLIST WAS COMPLETED AND THEY INITIATED AND COMPLETED THE DESCENT AS INSTRUCTED. ABOUT 15 MILES FROM THE AIRPORT, SUDDEN ENGINE ROUGHNESS WITH SUBSTANTIAL LOSS OF RPM WAS ENCOUNTERED. THEY OBSERVED THAT THE CYLINDER HEAD TEMPERATURES FOR CYLINDERS 1 AND 4 HAD DROPPED RAPIDLY. THEY BEGAN TO CIRCLE WHILE EXECUTING THE ENGINE POWER LOSS IN-FLIGHT CHECKLIST. THERE WAS NO IMPROVEMENT IN ENGINE PERFORMANCE. THEY COULD NOT MAINTAIN ALTITUDE.
THE CFI DECIDED TO EXECUTE A FORCED LANDING. HE SELECTED A SUITABLE FIELD FOR LANDING. THE AIRCRAFT LANDED SAFELY AND THE CFI SECURED THE AIRCRAFT. THERE WERE NO INJURIES AND NO DAMAGE TO THE AIRCRAFT OR PROPERTY.