What was found
WHILE PERFORMING A POST-REMOVAL INSPECTION OF A GTCP85-98CK APU EXHAUST PIPE (3850089-1), THREE INCH CRACKS WERE NOTED ON EACH MOUNTING FLANGE (TWO CRACKS TOTAL). CAUSE FOR CRACKS IS UNKNOWN. EXHAUST PIPE WAS MODIFIED BY ALLIED- SIGNAL TO SATISFY REQUIREMENTS OF EO 4-69905-3AD (AD 95-07- 03). THE AD REQUIRED THE INSTALLATION OF AN EXHAUST HUB FOR IMPROVED CONTAINMENT CAPABILITY IN CASE OF T-WHEEL FAILURE. TIME SINCE LAST SVI FOR APU: 813 HOURS. EXHAUST PIPE IS SUBJECT TO REPAIR OR REPLACEMENT BY ALLIEDSIGNAL.