COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 767 Series Aeroplanes AD/B767/49 Collins Flight Control Computers 2/91 Applicability: All models fitted with Collins flight control computers. Requirement: Inspect and/or modify as appropriate in accordance with the technical requirements of FAA AD 90-11-10 (Amdt 39-6608). Compliance: Part A. Prior to 31 December 1992. Part B. Prior to 31 December 1991. Background: To prevent intermittent altitude hold, altitude capture, and/or flight director mistracking anomalies.