What was found
(CAN) DURING SCHEDULED INSPECTION. AD CF90-03R2 BEING ACCOMPLISHED, A LARGE CRACK WAS FOUND AT THE TAILPIPE ATTACHMENT POINT, IN THE MUFFLER SUB-ASSY. IT WAS DIFFICULT TO DETERMINE ROOT CAUSE OF CRACK ORIGINATION, BUT POSSIBLE CAUSE WAS IMPACT WITH FOREIGN OBJECT WHEN AIRCRAFT LANDED IN AN UNPREPARED LANDING AREA. MUFFLER SUB-ASSEMBLY P/N C169-32 REPLACED WITH NEW ASSY, SAME P/N, A/C RELEASED FOR CONTINUED OPERATION (TC# 20070808001)