COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Mitsubishi MU-2 Series Aeroplanes AD/MU-2/55 Emergency Gear Down Gearbox 8/94 Applicability: All MU-2B-10, -15, -20, -25, -26 S/N 008 through 347, except S/N 313 and 321, MU- 2B-30, -35 and -36 S/N 501 through 696, except S/N 652 and 661. Requirement: Action in accordance with Mitsubishi MU-2 Service Bulletin No 219. Note: JCAB AD TCD-3942-94 refers. Compliance: Unless previously carried out within 100 hours time in service from 31 July 1994. Background: The manufacturer has advised that a lower pin of an emergency gear down gearbox has fallen out of the bracket housing.