COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bell Helicopter Textron 205 Series Helicopters AD/BELL 205/61 Main Transmission Lower Planetary Spider 2/95 Applicability: All Bell 205A, 205A-1 and 205B series helicopters with main transmission lower planetary spider P/N 412-040-785-101 installed. Requirement: Retire the spider in accordance with Bell Alert Service Bulletin ASB 205-93-54 for Bell 205A and 205A-1 and ASB 205B-93-16 for Bell 205B series helicopters. Note 1: FAA AD 94-18-09 Amdt 39-9022 refers. Spider P/N 412-040-785-103 is not limited by this AD. Compliance: Retire the spiders before 2500 hours time in service or within 100 hours time in service after 2 February 1995, whichever is the later. Background: Five failures of the main transmission lower planetary spider have been experienced during the manufacturer's fatigue tests. Accordingly a fatigue life has been established to prevent in service failures.