COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B747/71 and issues the following AD under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section. Boeing 747 Series Aeroplanes AD/B747/71 Amdt 1 Cavity Aft of Wing Centre Section 10/2003 Applicability: All Model 747 series aircraft. Requirement: Action in accordance with the technical requirements of FAA AD 2003-11-01 Amdt 39-13160. Note: Boeing Alert Service Bulletin 747-51A2057 refers. Compliance: As specified in the Requirement document, with a revised effective date of 2 October 2003. This Amendment becomes effective on 2 October 2003. Background: Debris and foreign material may block drainage of the cavity aft of the wing centre section and result in accumulated water leakage onto the lateral flight control cables and/or components and freezing; which could restrict or jam control cable movement and result in loss of controllability of the aircraft. Amendment 1 is issued in response to a new FAA AD, which adds new repetitive tests and inspections for discrepancies of the drainage system of the canted pressure deck. David Villiers Delegate of the Civil Aviation Safety Authority 1 August 2003 The above AD is notified in the Commonwealth of Australia Gazette on 10 September 2003. Page 1 of 1