COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Douglas DC3 Series Aeroplanes AD/DC3/33 Supplemental Inspection Program 7/94 Applicability: All Models. Requirement: Incorporate the inspection program outlined in McDonnell Douglas Report L26-013, "DC-3 Supplemental Inspection Document" (SID), into the maintenance schedule for the aircraft. Compliance: Incorporate the SID inspection program before 26 May 1995. Background: McDonnell Douglas Aircraft Corporation has produced a supplemental inspection program to ensure the continued safety of older DC-3 aircraft. This Airworthiness Directive mandates the application of the inspection program to Australian registered aircraft.