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-2/18 Flap Jack Screw - Inspection: Flap Gearbox - Inspection and Re-adjustment 3/77 Applicability: Model MU-2B-10, -51, -20, -25 and -26 with S/Nos. 005 to 326. Model MU-2B-30, - 35 and -36 with S/Nos. 501 to 672. Document: Mitsubishi SB No. 167C. Compliance: Within 100 hours time in service after 30 April 1977.