COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Embraer EMB-120 (Brasilia) Series Aeroplanes AD/EMB-120/13 Amdt 1 Wing Rib to Skin Fitting Angles 12/95 Applicability: All Model EMB-120 aircraft. Requirement: Action in accordance with the technical requirements of CTA AD 95-05-01R1 Amdt 39-746. Compliance: As specified in the requirement document. The original issue of this directive became effective on 20 July 1995. Background: The Brazilian CTA received reports of cracks in the wing rib to skin fitting angles (shear clips) in both the upper and lower wing skins. Amendment 1 is issued in response to a revision of the Requirement Document which requires a final corrective action.