As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON APPROACH THE #1 PROPELLER RPM DROPPED WHEN THE POWER WAS REDUCED. THE AIRCRAFT LANDED WITHOUT INCIDENT, BUT THE PROPELLER FEATHERED ON SHUTDOWN. THE PROP WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE. DISASSEMBLY OF THE FAULTY PROPELLER FOUND THE SHOULDER SCREW HAD BACKED OUT OF BRACKET P/N 57B1593, THIS SCREW IS HELD IN BY LOCTITE. THE SCREW AND BRACKET WERE REPLACED AND THE PROPELLER RETURNED TO SERVICE.