As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ENROUTE TO RECEIVING FACILITY THE SMELL OF BURNING WAS INDICATED BY THE CREW. NO PRESENCE OF SMOKE WAS NOTED. PERFORMED PRECAUTIONARY LANDING PERFORMED SHUT DOWN PROCEDURES EXITED THE HELICOPTER AND INSPECTED AIR CONDITIONING SYSTEM AND FOUND A BROKEN AND BURNT BELT. LATER DETERMINED BY MAINTENANCE THAT THE A/C PUMP HAD SEIZED CAUSING THE BELT FAILURE.