What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
The airman was on a cross country flight from bountiful, UT to manti, UT. On his return leg to bountiful at about 9,000 ft. MSL. The airman started to feel sick with stomach ache, pressure in his chest, nausea and weakness. The airman opened the cockpit window and decided to turn manti. The airman declared an emergency on 121.5 that was relayed to ATC via airliner. He started descending and as he did that he was coming in and out of consciousness. He decided to put the plane in a field to stay away from people and property and successfully landed in a field.
Wanting to see if carbon monoxide poisoning was a possibility an inspection of the aircraft's exhaust system was performed. The inspection revealed a leak near the heater shroud. It is unknown if the leak was occurring before this event or as a result of the off-field landing.
As the FAA filed it
THE AIRMAN WAS ON A CROSS COUNTRY FLIGHT FROM BOUNTIFUL, UT TO MANTI, UT. ON HIS RETURN LEG TO BOUNTIFUL AT ABOUT 9,000 FT. MSL. THE AIRMAN STARTED TO FEEL SICK WITH STOMACH ACHE, PRESSURE IN HIS CHEST, NAUSEA AND WEAKNESS. THE AIRMAN OPENED THE COCKPIT WINDOW AND DECIDED TO TURN MANTI. THE AIRMAN DECLARED AN EMERGENCY ON 121.5 THAT WAS RELAYED TO ATC VIA AIRLINER. HE STARTED DESCENDING AND AS HE DID THAT HE WAS COMING IN AND OUT OF CONSCIOUSNESS. HE DECIDED TO PUT THE PLANE IN A FIELD TO STAY AWAY FROM PEOPLE AND PROPERTY AND SUCCESSFULLY LANDED IN A FIELD.
WANTING TO SEE IF CARBON MONOXIDE POISONING WAS A POSSIBILITY AN INSPECTION OF THE AIRCRAFT'S EXHAUST SYSTEM WAS PERFORMED. THE INSPECTION REVEALED A LEAK NEAR THE HEATER SHROUD. IT IS UNKNOWN IF THE LEAK WAS OCCURRING BEFORE THIS EVENT OR AS A RESULT OF THE OFF-FIELD LANDING.