What was found
DURING ACFT''S FIRST 100-HR INSP, A .25 INCH LONG CRACK WAS FOUND IN A NOSE RIB OF THE LT AILERON. NOSE RIB IS AT THE AILERON''S CUT-OUT IN THE LEADING EDGE FOR THE INBD HINGE ATTACH POINT, ON THE OTBD SIDE. THE CRACK IS AT THE UPPER FWD CORNER OF THE NOSE RIB, AT A RELIEF RADIUS FOR THE BEND OF THE ATTACH FLANGES. THE CRACK IS AT THE UPPER FWD CORNER OF THE NOSE RIB, AT A RELIEF RADIUS FOR THE BEND OF THE ATTACH FLANGES. THE CRACK IS BEST VIEWED THROUGH THE EXISTING .75 INCH ACCESS HOLE IN AILERON''S BOTTOM SKIN. INSP, REVEALED ANOTHER CRACK IN THE RT AILERON, SAME LOCATION: INBD HINGE POINT, OTBD NOSE RIB. BOTH AILERONS RETURNED TO CESSNA. TWO NEW AILERONS WERE INSTALLED. CAUSE OF CRACKS UNKNOWN. (X