COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Boeing 747 Series Aeroplanes
AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B747/168 Amdt 1 and issues the following AD under subregulation 39.1 (1) of CAR 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.
AD/B747/168
Amdt 2
Engine Pylon Aft Torque Bulkhead 9/2000
Applicability: Model 747 series aircraft, as listed in Groups 1, 2, and 5 of Boeing Alert Service Bulletin 747-54A2184, Revision 1 dated 6 May 2000.
Requirement: Action in accordance with the technical requirements of FAA AD 2000-12-16 Amdt 39-11794.
Compliance: As specified in the Requirement document with a revised effective date of 7 September 2000.
This Amendment becomes effective on 7 September 2000.
Background: The FAA received two reports of cracking of the aft torque bulkhead at the number 1 and number 2 engine pylons. This cracking occurred on a Boeing model 747-200F series aircraft powered by Rolls Royce model RB211 series engines. Cracking of the aft torque bulkhead at the engine pylons, if not detected and corrected in a timely manner, could result in failure of a pylon and consequent separation of the engine from the wing.
Amendment 1 was prompted by a report of cracking found in the aft torque bulkheads of the outboard nacelle struts, and by the availability of new service instructions for detecting fatigue cracking.
Amendment 2 is issued in response to a new FAA AD which expands applicability to include additional aircraft while removing certain other aircraft from applicability.
This amendment also requires accomplishment of a new terminating action. Amendment 1 of this Airworthiness Directive became effective on 17 June 1999.
The original issue of this Airworthiness Directive became effective on 8 January 1997.
David Alan Villiers
Delegate of the Civil Aviation Safety Authority 14 July 2000
The above AD is notified in the Commonwealth of Australia Gazette on 9 August 2000.