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-2/37 Flap Flexible Shaft Sealing and Torque Check 12/85 Applicability: All models MU-2B/-10/-15/-20/-25/-26 with S/Nos. 008 to 347 except S/Nos. 313 and 321. All models MU-2B-30/-35/- 36 with S/Nos.501 to 696 except S/Nos. 652 and 661. Requirement: Action in accordance with Mitsubishi SB No. 198. Note: JCAB AD No. TCD-2451-85 refers. Compliance: At the next scheduled inspection for Maintenance Release issue after 31 December 1985. Background: The manufacturer reports failures of the flexible drive shaft attributable to ingress of moisture.