COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 747 Series Aeroplanes AD/B747/31 Aileron Control System - Modification 6/83 Applicability: All model 747 with S/Nos. referenced in Boeing SB. 27-2065, SB 27-2095, SB 27- 2161 and SB 51-2032 as applicable. Document: Boeing SBs 747-27-2065, 747-27-2095, 747-27-2161, 747-51-2032. Note: FAA AD 82-02-10 refers. Compliance: Unless previously accomplished, within 3000 hours time in service after 30 June 1983. Background: Numerous occurrences of binding in the aileron control system are attributed to the accumulation of ice on the aileron control system in the wing gear wheel well area.