CTHIn ForceLegislation
AD/B747/168 Amdt 3 - Engine Pylon Aft Torque Bulkhead
Boeing 747 Series AeroplanesBoeing 747 Series Aeroplanes
Start here
Get a plain-English read of Boeing 747 Series Aeroplanes
Turn the raw legal text into a practical explanation grounded in AD/B747/168 Amdt 3 - Engine Pylon Aft Torque Bulkhead.
Boeing 747 Series Aeroplanes
| AD/B747/168 Amdt 3 | Engine Pylon Aft Torque Bulkhead | 8/2009 |
|---|
| Applicability: | Model 747 series aircraft, as listed in Groups 1, 2, and 5 of Boeing Alert Service Bulletin (ASB) 747-54A2184, Revision 1, dated 6 May 1999. |
|---|---|
| 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 of7 September 2000.The compliance remains unchanged by issue of the Directive. |
| This Amendment becomes effective on 30 July 2009. | |
| 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 expanded applicability to include additional aircraft while removing certain other aircraft from applicability. This amendment also required accomplishment of a new terminating action.Amendment 3 is issued to correct the issue date of the related Boeing ASB. |
Image unavailable in extracted text
David Villiers
Delegate of the Civil Aviation Safety Authority
18 June 2009