COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Aerospatiale GY 80 (Horizon) Series Aeroplanes AD/GY80/5 Front Seat Restraint Installations - Modification 11/72 Applicability: All models. Requirement: Modify each front seat restraint installation by fitting a safety harness in accordance with a scheme approved by the Secretary. Note: Guidelines for installation schemes are outlined in airworthiness Advisory Circular No. 62 dated March 1972. Compliance: Before 1 January 1974.