COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 90 and 65-90 (King Air) Series Aeroplanes AD/BEECH 90/14 Elevator Tab Hinge Beam - Inspection 7/68 Applicability: All models in excess of 1000 hours total time in service. Requirement: Inspect the upper and lower flanges of the LH and RH elevator tab hinge beam P/N 50-610000-94 for cracking along the rivet line. Compliance: Forthwith and thereafter at intervals not exceeding 200 hours' time in service.