COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Gulfstream (Grumman American/ American Aviation) AA-1 Series Aeroplanes AD/AA-1/19 Seat Belt Attachment Bracket - Replacement 5/85 Applicability: All models AA-1, AA-1A, AA-1B and AA-1C. Requirement: Gulfstream Aerospace S.B. No. 173. Compliance: Within 50 hours' time in service after 31 May 1985. Background: It is possible for the existing P/N 60152-2 to fail on some aircraft in the event of severe deceleration.