Federal Register of Legislation - Australian Government

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AD/B747/357 - Station 400 Upper Deck Floor Beam

Authoritative Version
AD/B747/357 Airworthiness Directives/Pt 105 — Aircraft as made
Station 400 Upper Deck Floor Beam
Administered by: Infrastructure, Transport, Regional Development and Communications
Exempt from sunsetting by the Legislation (Exemptions and Other Matters) Regulation 2015 s12 item 15
Registered 10 Jul 2007
Tabling HistoryDate
Tabled HR07-Aug-2007
Tabled Senate07-Aug-2007



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


Station 400 Upper Deck Floor Beam




Model 747-400 series aircraft, as identified in Boeing Alert Service Bulletin
747-53A2660, dated 16 November 2006, or later FAA approved revision.


Action in accordance with the technical requirements of FAA AD 2007-10-09 Amdt 39-15050.


As specified in the Requirement document, with a revised effective date of
2 August 2007.


This Airworthiness Directive becomes effective on 2 August 2007.


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.

David Villiers
Delegate of the Civil Aviation Safety Authority

19 June 2007