As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXHAUST V-BAND COUPLING NEEDED FOR TURBOCHARGER OUTLET/ TAILPIPE CONNECTION ON THIS AC. ORIGINAL PN 555-511 WAS SUPERSEDED BY MFG TO THE PN 557-584 WILL NOT WORK. THE COUPLING GAP FULLY CLOSED AND BOTTOMED OUT BEFORE ADEQUATE TORQUE WAS REACHED. CONTACTED MFG REP, ENGINEERING AGREED THE PN 557584 IS NOT A VALID REPLACEMENT FOR THE PN 555-511, AND RECOMMENDED USE OF THE ORIGINAL COUPLING.(K)