As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OFF HOSPITAL, TURNED ON AIR CONDITIONER. IMMEDIATE ELECTRICAL SMELL AND THIN SMOKE ENTERED COCKPIT. SECURED AIR CONDITIONER, SMOKE AND SMELL CEASED. RETURNED TO BASE. MAINTENANCE FOUND (STC SH3509SW) AIR CONDITIONER COMPRESSOR SEIZED, CAUSING A BURNT SLIPPING DRIVE BELT AND ELECTRICAL FUMES. REPLACED DRIVE BELT AND COMPRESSOR. COMPRESSOR IS NOT TRACKED WITH SERIAL NUMBER AND IS ON CONDITION. (NO TSI/TSO)