As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HAVE SEEN THIS ATTACHMENT ARRANGEMENT ON MANY AC. FOUND NON SAFETIED SCREWS ATTACHING PROPELLER DEICE BRUSH ASSY TO MOUNTING. REMOVED NON SAFETIED SCREWS WITHOUT LOCKING DEVICES WITH MS35265-44 SCREW THAT CAN BE LOCKED WITH SAFETY WIRE. (K)