COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Seats and Berths AD/SEATS/6 Aviatech Flight Crew Seats 7/91 Applicability: Aviatech Inc. pilot & co-pilot seats Model 394, P/N's 394-(000)-01, -02, -03, -04, -05 and -06, and 394-(001)-01, -02, -03, -04, -05 and -06, approved by Transport Canada under TSO Design Approval C39A used on de Havilland DHC-8 aircraft. Requirement: Action in accordance with the Requirements of Transport Canada AD CF-91-04. Note: Aviatech SB 2 Rev A refers. Compliance: Prior to 1 September 1991. Background: There have been cases of excessive wear and fraying of the pilot and co-pilot shoulder harness caused by rubbing of the shoulder harness on the guides located on top of the seat-back. Compliance date required by Transport Canada is extended by one month due to receipt date of Canadian Directive.