What was found
DURING ANNUAL INSPECTION, TAILPIPE REMOVED. LARGE CRACK AT ONE OF THE UPPER WELDS NEAR TURBOCHARGER MATING FLANGE WAS NOTED. CRACK WAS OPEN .1250 INCH WIDE AND EXTENDED THREE-FOURTHS OF THE WAY AROUND PIPE. THIS PIPE IS PART OF STC SA2717S0 WHICH ELIMINATES REPETITIVE 50-HOUR DYE PEN. CHECKS OF STANDARD PIPER TAILPIPES PER AD 40-01-02. STC RECOMMENDS SHAKING TAILPIPES BY HAND ON EACH PRE-FLIGHT. THIS IS THE FIRST FAILURE OF THE MALLEN AEROSPACE TAILPIPES THIS AGENCY HAS SEEN SINCE STARTING TO INSTALL THEM IN MID-1990.