What was found
SECOND STAGE STATOR AIR SEAL RETAINING RIVETS FOUND LOOSE DURING INSPECTION/REPAIR FOR TURBINE SECTION DAMAGE. RETAINER PLATE RIVET HOLE DIAMETER(S) WERE ENLARGED BEYOND MAX RIVET MANUFACTURER SPECIFICATIONS. ENGINE MANUFACTURER MANUALS LACK ANY INSPECTION CRITERIA FOR RETAINER PLATE RIVET HOLE DIAMETER. ENLARGED RETAINER PLATE RIVET HOLE DIAMETER MAY RESULT IN LOOSE RETAINER AND/OR AIR SEAL CONTACTING TURBINE ROTOR HUB DURING ENGINE OPERATION.