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-2/34 Engine Air Intake Bleed Air Tubing Coupling Nut Retorque, Inspection, Modification 7/84 Applicability: All models MU-2B/-10/-15/-20/-25/-26 with S/Nos. 008 to 347 (except S/Nos. 313SA and 321SA) and MU-2B-30/-35/ -36 with S/Nos. 501 to 696 (except S/Nos. 652SA and 661SA). Document: Mitsubishi SB No. 196 Rev A. Note: JCAB AD No. TCD-2342-84 refers. Compliance: Before further flight after 31 July 1984. Background: Loss of engine bleed air at the intake anti-ice coupling nut can cause malfunction of the engine air intake anti-ice system. The manufacturer has therefore introduced an inspection and a minor modification to ensure permanent security of the coupling nut.