What was found
AFTER AIRCRAFT WAS STRIPPED IN PREPARATION FOR PAINT, A LARGE AMOUNT OF PLASTIC FILLER WAS DISCOVERED ON THE FUSELAGE IN LINE WITH THE PROPELLER ROTATIONAL PLANES. REMOVAL OF THE FILLER REVEALED EXTENSIVE GRINDING TO ENSURE THE FILLER WOULD STICK AND GOUGES FORM A 'CHEESE GRATER' TYPE FILE, NO ALODINE WAS APPLIED, ALTHOUGH NO CORROSION WAS NOTED. THE DAMAGE IS CURRENTLY BEING EVALUATED FOR THE DEVELOPMENT OF A REPAIR SCHEME. SUBMITTER SUGGESTS CAREFUL ADHERENCE TO PROPER MAINTENANCE TECHNIQUES AND MM REQUIREMENTS WOULD HAVE PREVENTED THIS DAMAGE.