Boeing 747 Series Aeroplanes
Boeing 747 Series Aeroplanes
Boeing 747 Series Aeroplanes
| AD/B747/357 | Station 400 Upper Deck Floor Beam | 8/2007 |
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| Applicability: | Model 747-400 series aircraft, as identified in Boeing Alert Service Bulletin747-53A2660, dated 16 November 2006, or later FAA approved revision. |
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| Requirement: | Action in accordance with the technical requirements of FAA AD 2007-10-09 Amdt 39-15050. |
| Compliance: | As specified in the Requirement document, with a revised effective date of2 August 2007. |
| This Airworthiness Directive becomes effective on 2 August 2007. | |
| Background: | The FAA received several reports of fatigue cracking in upper deck floor beams made from 7000 series aluminium alloy. Undetected cracking in the upper deck floor beam at station 400 could extend and sever the floor beam, which could result in loss of controllability and rapid decompression of the aircraft. |
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David Villiers
Delegate of the Civil Aviation Safety Authority
19 June 2007