As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ENROUTE BACK TO BASE FROM SAN ANTONIO, ABOUT FIVE MILES EAST OF HONDO, TEXAS; MEDICAL CREW REPORTED THE SMELL OF "BURNING PLASTIC" IN THE AFT CABIN. THE SMELL WENT AWAY AND THEN CAME BACK. I NEVER SMELLED ANYTHING IN THE COCKPIT. I ELECTED TO MAKE A PRECAUTIONARY LANDING AT THE HONDO, TEXAS AIRPORT AND CALLED MAINTENANCE. REAR A/C BLOWER WAS FOUND TO BE THE PROBLEM.