COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES SIAI Marchetti FN-333 (Riviera) Series Aeroplanes AD/FN-333/4 Front Seat Restraint Installations - Modification NK Applicability: All models. Requirement: Modify each front seat restraint installation by fitting a safety harness in accordance with a sche me 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.