What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
While in cruise flight the pilot experienced a rough running engine and smoke in the cabin. Pilot reduced engine power, turned all electrical power, cabin heat, and executed an emergency landing at the new cliff, CO airport (6V6). Aircraft landed without incident. Maintenance personnel from cimarron air located at montrose, CO, inspected the aircraft and discovered that the engine had developed a crack in one of the cylinder heads. This allowed oil to come in contact with the exhaust system producing the smoke which entered through the heater system. Cylinder was changed and a m&d form 8010-4 was submitted by the agency performing the maintenance. This incident is closed with no further action.
As the FAA filed it
WHILE IN CRUISE FLIGHT THE PILOT EXPERIENCED A ROUGH RUNNING ENGINE AND SMOKE IN THE CABIN. PILOT REDUCED ENGINE POWER, TURNED ALL ELECTRICAL POWER, CABIN HEAT, AND EXECUTED AN EMERGENCY LANDING AT THE NEW CLIFF, CO AIRPORT (6V6). AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE PERSONNEL FROM CIMARRON AIR LOCATED AT MONTROSE, CO, INSPECTED THE AIRCRAFT AND DISCOVERED THAT THE ENGINE HAD DEVELOPED A CRACK IN ONE OF THE CYLINDER HEADS. THIS ALLOWED OIL TO COME IN CONTACT WITH THE EXHAUST SYSTEM PRODUCING THE SMOKE WHICH ENTERED THROUGH THE HEATER SYSTEM. CYLINDER WAS CHANGED AND A M&D FORM 8010-4 WAS SUBMITTED BY THE AGENCY PERFORMING THE MAINTENANCE. THIS INCIDENT IS CLOSED WITH NO FURTHER ACTION.