COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Pratt and Whitney Canada Turbine Engines - JT15D Series AD/JT15D/6 Amdt 1 Fan Blades 11/87 Applicability: JT15D-1,-1A,-1B,-4,-4B,-4C and -4D. Requirement: Action in accordance with PWC SB No 7257 Rev 2. Note: Transport Canada AD CF-87-05R1 refers to SB 7257. Compliance: Unless already accomplished: 1. Within 25 flight hours or 15 days after 1 May 1987. 2. Prior to installation in an aircraft. Background: This Directive was issued to reflect the requirements of Transport Canada Emergency Airworthiness Directive CF-87-05R1. The Canadian Directive was issued following a JT15D fan blade event which apparently resulted from machine marks on the blade root fillet radius. This Directive is now amended to reflect SB 7257 Rev 2 which further identifies specific engine models affected.