(The above reporter provides another defect description of a heater, this one from a Beech Baron.)

“A heater core was received from a customer. The combustion tube (P/N 45C40) was found cracked at the cross-over port which connects the inner combustion tube to the outer combustion tube. The malfunction was found using a pressure decay test, even though this test is not required on the D83A28 heater assembly. The serial number on the combustion tube indicates it was manufactured in August 1995. I recommend pressure decay tests on these heater assemblies. AD 2004-21-05 does not apply to these heaters.” (The combustion tube part number yields four additional entries in the SDRS data base.)

Part Total Time: (unknown).