What was found
WHILE PERFORMING A POST-REMOVAL INSPECTION OF A GTCP85-98CK APU EXHAUST PIPE (3850089-1), A 10 INCH CIRCUMFERENTIAL CRACK WAS NOTED ON THE PLENUM MOUNTING FLANGE. CAUSE FOR CRACK IS UNKNOWN. EXHAUST PIPE WAS MODIFIED BY ALLIED SIGNALTO SATISFY REQUIREMENTS OF EO 4-69905-3AD (AD 95-07-03). THE AD REQUIRED THE INSTALLATION OF AN EXHAUST HUB TO IMPROVE CONTAINMENT CAPABILITY IN CASE OF T-WHEEL FAILURE. TIME SINCE LAST SVI FOR APU: 1664 HOURS. EXHAUST PIPE IS SUBJECT TO REPAIR OR REPLACEMENT BY ALLIED SIGNAL.