COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Gates Learjet 35 and 36 Series Aeroplanes AD/LEARJET 35/23 Amdt 2 Flap System and Flap Sector Mounting Brackets 1/87 Applicability: All models Learjet with serial numbers listed in Requirement Document. Requirement: Modify in accordance with Gates Learjet SB AMK 86-4. Compliance: Unless already accomplished, within 100 hours time in service or at the next inspection for Maintenance Release issue after 31 January 1987 whichever is later. Background: This Directive was initially issued due to cracking of the flap sector mounting brackets. A repetitive inspection was later included because of further cracking after inspection. This amendment now requires modification using steel sector mounting brackets and deletes the repetitive inspection.