What was found
(CAN) TURBINE CUSTOMER WORKSCOPE WAS "REPAIR FOR VIBRATION - .9 IPS AT 32,000RPM. AND CRACKED EXHAUST CLAMP & STACKS". AFTER DISMANTLE, IT WAS DISCOVERED THAT NR 3 WHEEL HAS A PIECE OF METAL BROKEN OFF ON T/E SIDE OF OUTER SHROUD BETWEEN WHEEL BLADES THAT COVERS APPROX .600" AREA RADIALLY & .360" AREA AXIALLY (FIGURES 1 AND 2). NORMALLY SLOTS IN TURBINE WHEEL OUTER SHROUDS ARE CUT CENTRALLY IN GAPS BETWEEN TURBINE BLADES BUT IN THIS CASE ONE SLOT WAS CUT OFFSET FROM GAP CTR (FIG 3 - NORMAL SLOT, FIG 4 - OFFSET SLOT). MATERIAL BREAKOUT ON WHEEL IS ON OTHER SIDE OF WHEEL AS SHOWN IN FIG 4. A REP FROM OEM HAS REVIEWED TURBINE WHEEL. PERMISSION IS REQUESTED TO PROVIDE TURBINE WHEEL TO MFG FOR FURTHER ANALYSIS.