What was found
WHILE TROUBLE SHOOTING FOR A REPORTED UNUSUAL VIBRATION IN FLIGHT, A BORESCOPE INSPECTION DISCOVERED A MISSING 3RD STAGE IP ROTOR BLADE. DISASSEMBLY OF THE ENGINE CONFIRMED THAT ONE OF THE 3RD STAGE IPC ROTOR BLADES WAS MISSING.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
WHILE TROUBLE SHOOTING FOR A REPORTED UNUSUAL VIBRATION IN FLIGHT, A BORESCOPE INSPECTION DISCOVERED A MISSING 3RD STAGE IP ROTOR BLADE. DISASSEMBLY OF THE ENGINE CONFIRMED THAT ONE OF THE 3RD STAGE IPC ROTOR BLADES WAS MISSING.