What was found
DURING A LEVEL 2 INSPECTION OF A ENG, THE 04 MODULE MARK M041 00092, SN FM9994 TSN=49837 HOURS, CSN=6456 CYCLES, WAS SUBJECT OF THE PERTINENT LEVEL 2 INSPECTIONS, INTERFACE CHECKS, WHICH ENABLED ACCESS TO THE FRONT FACE OF THE HPC, STAGES 1 - 4 A PIECE OF METAL WAS ENCOUNTERED WEDGED INTO ONE OF THE GROOVES ON THE FRONT FACE OF THE HPC STAGES 1 - 4 SHAFT. FURTHER INSPECTION FOR THE SOURCE OF THE UNKNOWN PIECE OF METAL, INCLUDED BORESCOPE INSPECTION OF ALL INNER CAVITIES OF THE HPC ROTORS, WHICH REVEALED EVIDENCE OF GOUGING, SCORING & IMPACT DAMAGE TO THE MAJORITY OF THE HPC ROTOR INNER CAVITIES. A MORE DETAILED INSPECTION OF THE JOINT FACES BETWEEN THE HPC STAGES 1 - 4 SHAFT & THE HPC STAGES 5 - 6 SHAFT REVEALED THAT ONE OF THE HPC ANTI-SCORE PLATES PN-FK18942. HAD SHEARED AT THE LOCKING TAB FEATURE, RELEASE OF THIS LOCKING TAB FEATURE CAUSED DAMAGE TO SEVERAL OF THE INNER CAVITIES IN BOTH HPC ROTORS. THIS 04 MODULE SN-FM9994 HAD ITS LAST LEVEL 2 VISIT IN JULY 2009 UNDER TAESL RACK JV561Z. ATTACHED ARE PHOTOS OF THE SHEARED LOCKING TAB FEATURE IN ONE OF THE HPC ANTI-SCORE PLATES, IN ADDITION TO GOUGING, SCORING & IMPACT DAMAGE ON THE INNER CAVITIES OF BOTH HPC ROTORS.