What was found
PILOT REPORTED FLUCTUATION OF N2 RPM INDICATION. UPON INVESTIGATION, FOUND THE PT RETENTION SYSTEM NUT LOOSE WHICH CAUSED GALLING OF THE SPEED INDICATOR PLUG ON THE PT ROTOR, THE FLANGE, SPACER, AND NUT.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
PILOT REPORTED FLUCTUATION OF N2 RPM INDICATION. UPON INVESTIGATION, FOUND THE PT RETENTION SYSTEM NUT LOOSE WHICH CAUSED GALLING OF THE SPEED INDICATOR PLUG ON THE PT ROTOR, THE FLANGE, SPACER, AND NUT.