COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 747 Series Aeroplanes AD/B747/144 Engine Thrust Control - Idler Cable Pulley Support Bracket 5/95 Applicability: B747 Line numbers 202 to 886 inclusive equipped with GE CF6-45/50 engines. Requirement: 1. Visually inspect number 1 strut engine thrust control cable idler pulley support bracket for cracking in accordance with Boeing SB 747-76A2083. Brackets with a single crack less than 2.0 inches long may remain in service provided the interim repair is installed in accordance with Boeing SB 747-76A2083 Revision 1. 2. Replace the aluminium alloy idler pulley support bracket with one made of Inconel 625 in accordance with Boeing SB 747-76A2083 Revision 2. Note: FAA AD 93-17-06 refers. Compliance: 1. a. Inspect in accordance with Requirement 1 before 9000 hours time in service or within 600 hours time in service from 27 April 1995, whichever is the later. Re-inspect at intervals not to exceed 600 hours time in service. 1. b. Inspect brackets with the interim repair installed in accordance with Requirement 1 at intervals not to exceed 100 hours time in service. 2. a. Replace interim repaired brackets in accordance with Requirement 2 within 750 hours time in service from repair installation. 2. b. Replace brackets in accordance with Requirement 2 before 10 November 1995. Note: Replacement with brackets manufactured from Inconel 625 cancels the inspection requirements of this AD. Background: Five operators have reported cracks in the thrust control cable idler pulley support brackets. Failure of the brackets could result in loss of control of engine thrust.