COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes AD/DHC-8/53 Roll Disconnect System 6/98 Applicability: DHC-8 aircraft, Models 102, 103, 106, 201, 202, 301, 311, 314, and 315, with serial numbers 3 through 433. Requirement: Install Modification 8/2376 in accordance with de Havilland Service Bulletin 8-27- 79, Revision A. Note: Transport Canada AD CF-98-04 refers. Compliance: Before 21 November 1998. This airworthiness directive becomes effective on 21 May 1998. Background: Several incidents have been reported of uncommanded roll system disconnects during landing.