COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 33 and 35-33 (Debonair/Bonanza) Series Aeroplanes AD/BEECH 33/34 Pilot and Co-Pilot Seat Frame Assemblies 13/88 Applicability: Models F33A with S/Nos CE-621 through CE-1024. Models F33C with S/Nos CJ-112 through CJ-155. Requirement: Action in accordance with Beechcraft Mandatory SB 2010 Rev 1 Part II. Note: FAA AD 88-21-02 refers. Compliance: At the next scheduled inspection for Maintenance Release issue after 29 December 1988. Background: To prevent failure of the pilot and copilot seat attachment during an emergency landing.