COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Emergency Equipment AD/EMY/28 Aerazur Liferaft 4/93 Applicability: Aerazur Type 346 Liferaft. Requirement: Action in accordance with Aerazur Mandatory Service Bulletin 346.60.001. Note: DGAC AD 92-246(AB) refers. Compliance: Prior to 15 May 1993. Background: Reports have been received of liferaft manual inflation/deflation valves with deteriorated flange material.