What was found
JANITROL COMBUSTION HEAD ASSY, PN 51A45, ON HEATER ASSY, PN D83A28, HAD A ONE INCH DIAMETER RUST HOLE. THIS HOLE WAS CAUSED BY AGE, DETERIORATION AND USE. THE HEATER HAD BEEN IN OPERATION SINCE 1960. SUBMITTER RECOMMENDED A RECURRING ADVISORY DIRECTIVE FOR AGING BEECH BARON MODELS 55, A55, B55, AND B55A, AND BEECH TRAVELAIR MODELS 95, B95, B95A, D95A, AND E95 THAT CORPORATE THE JANITROL 83A28 SERIES COMBUSTION ACFT HEATERS. THERE IS A REGULARLY SCHEDULED MAINTENANCE PROCEDURE CALLED OUT IN THE 83A28 SERIES JANITROL OVERHAUL MANUAL. (X)