AD/B747/392 Fuselage Upper Lobe Doubler (Cth)
AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(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/B747/392 | Fuselage Upper Lobe Doubler | 7/2009 |
Applicability: | Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, 747SR and 747SP series aircraft; as identified in Boeing Alert Service Bulletin |
Requirement: | Action in accordance with the technical requirements of FAA AD 2009-09-08 Amdt 39-15894. |
Compliance: | As specified in the Requirement document, with a revised effective date of |
| This Airworthiness Directive becomes effective on 2 July 2009. | |
Background: | The FAA received reports of cracks in the radius detail of the fuselage upper lobe doublers. Such cracking, unless detected and corrected, could result in significant degradation of the fuselage structure and reduce its ability to carry flight loads from the vertical stabiliser, which could adversely affect the controllability of the aircraft. |
David Villiers
Delegate of the Civil Aviation Safety Authority
22 May 2009
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