What was found
DURING WING REMOVAL, BOTH AFT SPAR TO FUSELAGE ATTACH BOLTS (AN4-13) WERE FOUND EXTREMELY WORN. THE HOLES IN THE FUSELAGE ATTACH POINTS WERE ALSO WORN OVERSIZE (APPROXIMATELY .3125 INCH). APPARENT CAUSE OF THIS DEFECT IS INSUFFICIENT BEARING AREA OF THE FUSELAGE ATTACH POINTS AND INSUFFICIENT CLAMPING ACTION BETWEEN THE AFT SPAR FITTING AND FUSELAGE ATTACH POINT ALLOWING RELATIVE MOVEMENT. THIS 180 HP 'SCOUT' HAS BEEN USED EXTENSIVELY AS A GLIDER TOW-PLANE.