What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
N8099W was departing on runway 6 at Clarion County Airport. CFI, detected a slight engine roughness at 400 feet. CFI proceeded to conduct a magneto check which checked fine. The student, quickly turned on the carburetor heat and turned it off without instruction from the CFI. The student believed that he saw smoke and declared an engine fire as the engine began to shutdown. CFI took control of the airplane and turned the plane to a grass field. CFI and student attempted a restart of the engine. The engine did not restart and began the secure engine checklist. CFI landed the airplane under no power in field.
As the FAA filed it
N8099W WAS DEPARTING ON RUNWAY 6 AT CLARION COUNTY AIRPORT. CFI, DETECTED A SLIGHT ENGINE ROUGHNESS AT 400 FEET. CFI PROCEEDED TO CONDUCT A MAGNETO CHECK WHICH CHECKED FINE. THE STUDENT, QUICKLY TURNED ON THE CARBURETOR HEAT AND TURNED IT OFF WITHOUT INSTRUCTION FROM THE CFI. THE STUDENT BELIEVED THAT HE SAW SMOKE AND DECLARED AN ENGINE FIRE AS THE ENGINE BEGAN TO SHUTDOWN. CFI TOOK CONTROL OF THE AIRPLANE AND TURNED THE PLANE TO A GRASS FIELD. CFI AND STUDENT ATTEMPTED A RESTART OF THE ENGINE. THE ENGINE DID NOT RESTART AND BEGAN THE SECURE ENGINE CHECKLIST. CFI LANDED THE AIRPLANE UNDER NO POWER IN FIELD.