COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Seats and Berths AD/SEATS/2 Enviroform Fibreglass/Kevlar Reinforced Seats 3/88 Applicability: All Enviroform seats. These are normally fitted but not restricted to the following Cessna aircraft: Model Serial No. C.402B and C 402B1047 to 402C1020 C.404 404-0001 to 404-0859 C.421C 421C0055 to 421C1807 C.F406 F406-0001 to F406-0021 C.441 441-0001 to 441-0362. Requirement: Action in accordance with Cessna MEB 87-9, CAB 87-16 or CQB 87-5. Compliance: Within 100 hours time in service after 24 March 1988. Background: These seats were the subject initially of AD/CESSNA 400/50 issued in 1977. Since that time these seats have been found retrofitted to other aircraft. Additionally Cessna are now further modifying the seats and have expanded the applicability to include further aircraft.