What was found
EACH MUFFLER REQUIRED 3 SEALS, 0550157-29-30 AND -31 WHICH PROTECTS THE HEATER PINS FROM DAMAGING THE WALL OF THE MUFFLER FROM FRACTURING RESULTING IN OXYGEN ENTERING THE CABIN. THERE WAS ONLY ONE SEAL TOTAL IN THE 2 UNITS. REP ADVISED 6 SEALS ARE REQURIED TO ENSURE AIRWORTHINESS. THE LAST ANNUAL INSPECTION THAT C/W WITH THE MANUFACTURER'S REQUIRED FORMAT WAS JULY, 1985. SUBSEQUENT INSPECTIONS MADE NO REFERENCE IN MAINTENANCE RECORDS OF C/W MUFFLER INSPECTIONS.