As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ONE NUT PLATE HOLDING THE INTAKE BELL MOUTH TO THE FIRE WALL DEPARTED FROM ITS MOUNTING AND WAS INGESTED BY THE COMPRESSOR. THIS CAUSED A VIOLENT YAW AND PARTIAL LOSS OF POWER. THE PILOT ENTER AN AUTO-ROTATION AND LANDED SUCCESFULLY WITH MINIMAL DAMAGE TO THE AIRCRAFT.