What was found
UPON ACCOMPLISHMENT OF CESSNA SB ME78-31 AND SK404-21 (REPLACEMENT OF NOSE GEAR ACTUATOR ALUMINUM ATTACH LUGS WITH STEEL ATTACH LUGS) FOUND BOTH CHANNELS TO WHICH LUGS ATTACH WERE CRACKED AT AFT CORNER RADII. REPLACED CHANNELS. SUSPECT CAUSE: HARD LANDING, LANDING ON NOSE GEAR, POSSIBLE INCORRECT RIGGING OF NOSE GEAR WITH INSUFFICIENT PRELOAD OF ACTUATOR AGAINST DRAG BRACE; THUS, CAUSING SHOCK LOADS TO BE TRANSMITTED THROUGH ACTUATOR TO ATTACH STRUCTURE.