COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 99 Series Aeroplanes AD/BEECH 99/7 Pilot and Co-Pilot Chair Locking Mechanism 7/97 Applicability: Models 99, 99A, A99A, B99, and C99 Airliner with serial numbers U-1 through U-239. Requirement: a. Inspect the pilot and co-pilot chairs to assure that the locking pins will fully engage in the seat tracks, in accordance with the "Accomplishment Instructions" section of Beech Service Bulletin 2444 Revision II. b. Modify any chair where the locking pin fails to fully engage or is misaligned, in accordance with the maintenance manual as specified in Beech Service Bulletin 2444, Revision II. Note: FAA AD 97-06-06 Amdt 39-9963 refers. Compliance: Unless already accomplished, within 150 hours' time in service after 19 June 1997. This airworthiness directive becomes effective on 19 June 1997. Background: The FAA received reports of pilot and co-pilot chair locking pin malfunctions, which in one instance caused the pilot chair to slide back from the full forward position. The FAA AD requires the inspection to be accomplished in accordance with revised service information, as reflected in Revision II of the requirement document.