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AD/B747/294 Amdt 2 - Horizontal Stabiliser Outboard Centre Sections Upper Skin and Rear Spar Structure
Boeing 747 Series AeroplanesBoeing 747 Series Aeroplanes
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Boeing 747 Series Aeroplanes
| AD/B747/294 Amdt 2 | Horizontal Stabiliser Outboard Centre Sections Upper Skin and Rear Spar Structure | 2/2009 |
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| Applicability: | All Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D,-400F, 747SR, and 747SP series aircraft. |
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| Requirement: | Action in accordance with the technical requirements of FAA AD 2006-10-16 Amdt 39-14600.Note: Boeing Alert Service Bulletins 747-55A2050 and 747-55A2050 Revision 1, or later FAA approved revision, refer.Corrective actions (repairs or repeat inspections) that are approved on an FAA form 8100-9 and approved by the Manager, Seattle Aircraft Certification Office or delegate as an Alternative Method of Compliance (AMOC) to the requirements of FAA AD 2006-10-16, may be carried out without the need to obtain an exclusion from CASA from this airworthiness directive. |
| Compliance: | As specified in the Requirement document. |
| This Amendment becomes effective on 12 February 2009. | |
| Background: | The FAA has received numerous reports of cracking from two operators of six 747 series aircraft. Of the 22 reports of cracking received, 20 of the reports were in an area not covered by the Zone A inspections required by FAA AD 2002-06-02 (AD/B747/271). This Directive requires certain inspections to detect such cracking, which if undetected, could lead to reduced structural capability of the outboard and centre sections of the horizontal stabiliser, and result in loss of controllability of the aircraft.This amendment allows the use of an FAA approved Alternative Method of Compliance (AMOC) to the requirements of this AD, without the need for the operator to continually apply for an exclusion for repairs that are already approved on a form 8100-9 as an AMOC by an FAA delegate. |
| Amendment 1 of this AD became effective on 6 July 2006. |
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David Punshon
Delegate of the Civil Aviation Safety Authority
18 December 2008