What was found
DURING AN INVESTIGATION FOR DAMAGE FROM AN INTAKE FIRE, THE ALTERNATE AIR DOOR WAS FOUND BROKEN LOOSE FROM THE FIBERGLASS AIR DUCT. THIS AIRCRAFT HAS BEEN MODIFIED IAW A PETERSON 260 SE/STOL CONVERSION. THIS DOOR COULD BLOCK THE AIR FLOW TO THE INTAKE SYSTEM. SUBMITTER RECOMMENDS PERIODIC INSPECTION OF THE ALTERNATE AIR DOOR MOUNTING SECURITY. ALSO, RECOMMEND A DRAIN SYSTEM TO PREVENT FIRE HAZARD DURING STARTING.