As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING 299 EVALUATION CHECK RIDE, PILOT ON THE CONTROLS HEAR A FAINT SQUEELING, SCREECHING SOUND FOLLOWED BY A STRONG SMOKE SMELL IN THE COCKPIT. ACFT WAS IMMEDIATELY LANDED BACK AT THE BASE/AIRPORT (KTHA) AND SHUT DOWN FOR INSPECTION. THE AIRC ONDITIONING BELT WAS FOUND SEPARATED AND PARTIALLY MELTED.