COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Emergency Equipment AD/EMY/30 Dunlop-Beaufort Mk 28 Lifejacket 9/93 Applicability: All lifejackets if used in conjunction with an immersion suit. Requirement: Action in accordance with Dunlop-Beaufort Service Bulletin No 131. Compliance: Prior to 19 May 1994. Note: CAA (UK) AD 008-04-93 refers. Background: The Service Bulletin introduces a modification to increase the nominal buoyancy of the lifejacket to ensure immersion suit compatibility.