As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEATER COR RECEIVED FROM CUSTOMER. COMBUSTION TUBE FOUND CRACKED AT CROSSOVER PART WHICH CONNECTS THE INNER COMBUSTION TUBE TO THE OUTER COMBUSTION TUBE. MALFUNCTION FOUND USING A PRESSURE DECAY TEST, EVEN THOUGH THIS TEST IS NOT REQUIRED ON THE D83A28 HEATER ASSY. THE SERIAL NUMBER ON THE COMBUSION TUBE INDICATES IT WAS MFG IN AUG 1995. RECOMMEND PRESSURE DECAY TESTS ON THESES HEATER ASSEMBLIES. AD DOES NOT APPLY TO THESE HEATERS. (K)