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AD/B747/337 - Upper Chords of the Upper Deck Floor Beams
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AD/B747/337 - Upper Chords of the Upper Deck Floor Beams
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| AD/B747/337 | Upper Chords of the Upper Deck Floor Beams | 1/2006 |
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| Applicability: | Model 747-100, -100B, -100B SUD, 747-200B, 747-300, 747SP, and 747SR series aircraft; as identified in Boeing Alert Service Bulletin 747-53A2452, dated 3 April 2003, or later FAA approved revision. |
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| Requirement: | Action in accordance with the technical requirements of FAA AD 2005-20-29Amdt 39-14326.Note: Boeing Service Bulletin 747-53-2349 and Boeing Alert Service Bulletins747-53A2349 Revision 1 and Revision 2; or later FAA approved revisions, refer. |
| Compliance: | As specified in the Requirement document, with a revised effective date of19 January 2006. |
| This Airworthiness Directive becomes effective on 19 January 2006. | |
| Background: | Fatigue testing by the manufacturer revealed severed upper chords of the upper deck floor beams due to fatigue cracking. Undetected cracking could result in large deflection or deformation of the upper deck floor beams, resulting in damage to wire bundles and control cables for the flight control system, and reduced controllability of the aircraft. |
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David Villiers
Delegate of the Civil Aviation Safety Authority
28 November 2005