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-120/22 Wing and Empennage Leading Edge 1/98 Applicability: All models EMB-120 aircraft. Requirement: Inspect in accordance with Embraer Alert Service Bulletin 120-51-A004. Note: CTA AD 97-09-07 Amdt 39-802 refers. Compliance: Unless already accomplished, within 75 hours time in service after 1 January 1998. This airworthiness directive becomes effective on 1 January 1998. Background: An occurrence was reported of delaminations in the wing leading edge top layer, immediately behind the ice boot upper edge. This Directive requires a visual inspection for erosion, delamination and condition of sealing and anti-static paint.