What was found
LAW - DURING INSPECTION OF RT ENGINE, POWER GEARBOX (PGB) PROPELLER SHAFT FOLLOWING PROPELLER REMOVAL, THE SHAFT FLANGE SHOWED EVIDENCE OF FRETTING IN AREA INBOARD OF MOUNTING BOLT HOLES. THIS DAMAGE TRAVELED 360 DEGREES AROUND FLANGE AREA AND APPEAR TO BE APPROX .035 INCH DEEP (MAX). THE PROPELLER HUB WAS INSPECTED, REVEALING EVIDENCE OF DAMAGE. THE PGB, PN 775900-10, SN UDAG071S, WAS REMOVED FROM SERVICE AND SENT TO VENDOR FOR TEAR DOWN AND REPAIRS. PART TOTAL CYCLES, 12,493. (X)