COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Aermacchi - Lockheed AL 60 Series Aeroplanes AD/AL 60/9 Centre Elevator Hinge Bearing Assembly - Inspection Applicability: Models AL 60 and AL 60B with Serial Nos. prior to 60/6240. Document: Aermacchi Lockheed 60 SB No. 11. Compliance: At intervals not exceeding 25 hours' time in service after 1 September 1971. 3/65