COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Schweizer (Hughes) 269 Series Helicopters AD/HU 269/27 Amdt 1 Lower Coupling Drive Shaft - Inspection 2/69 Applicability: Model 269A with S/Nos. 0011 thru 0893, Model 269A-1 with S/Nos. 0001 thru 0041, Model 269A-2 with S/Nos. 0001 and 0002, Model 269B with S/Nos. 0001 thru 0359. Document: 1. Hughes SIN No. N-55.1; or 2. FAA AD 68-26-1. Compliance: For installed shafts - within 25 hours time in service after 4 November 1968. For new replacement shafts - before installation on a helicopter after 4 November 1968.