As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SIGNIFICANT EVENT-SUSPECTED AUTOFEATHER -PILOTS REPORTED THAT THE NR 2 ENGINE PROPELLER FEATHERED VIOLENTLY IN AIR WITH PROPELLERS FULL FWD AND REDUCING POWER. AUTO FEATHER SWITCH WAS IN THE ARMED POSITION 500 FT ABOVE THE GROUND. MX GROUND RUNS SHOWED THE LT AND RT AFX PEDESTAL SWITCHES OUT OF RIG. MX COMPLIED FLEET CAMPAIGN DIRECTIVE 1900-08-61-01. OPS CHECK ON GROUND WAS GOOD IAW MM 61-21-00.