COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Fokker F28 Series Aeroplanes AD/F28/39 Pilot and Passenger Seat Locking Mechanism - Inspection and Modification 4/79 Applicability: All model F28 aeroplanes fitted with "IPECO" Seats in pilot compartment or in locations other than pilot compartment. Document: 1. RLD AD No. 79/05/25; or 2. Fokker SB No. F28/25-82. Compliance: In accordance with requirement document No. 1 except that initial inspection shall be performed within 50 hours time in Service after 1 March 1979.