As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKE OFF THE RT ENGINE FEATHERED. INSPECTION REVEALED PROPELLER SYNCROPHASER COIL HAD BECOME SEPARATED FROM THE GOVERNOR BODY, CAUSING THE PROPELLER TO FEATHER. THE ATTACHING STUDS ON THE COIL HAD SHEARED AND BECAME BOUND UP WITH THE FLYWEIGHT ASSY. PULLING THE METERING ROD NTO THE FEATHER POSITION. RECOMMEND A CLOSER INSPECTION OF THE (PN C20722) COIL OR POSSIBLY REPLACEMENT AT OVERHAUL. (K)