Document ID: chunk:federal_register_of_legislation:F2007L02145:body:0:p7
Version: federal_register_of_legislation:F2007L02145
Segment Type: other
Provision Reference: 
Character Range: 17489–19508

done as of the effective date of this AD: accomplish within 1,000 flight cycles after doing any inspection required by the new requirement 5 of this AD.

                9. This inspection must be performed at intervals not to exceed 750 flight cycles. Operators may alternate the inspection methods provided that the corresponding repetitive inspection interval is not exceeded.
             This Amendment becomes effective on 2 August 2007.
Background:  This Directive was originally raised on 4 February 1986, following multiple instances of severe cracking on the forward fuselage Section 41.  At the time, the requirements of this Directive exceeded those of Boeing SB 747-53A2265, Revision 8 and FAA AD 91-11-01, which has now been superseded by FAA AD 2005-08-01.  The amended requirements reflect the results of inspections conducted in Australia and overseas in accordance with previous Directives.

             Amendment 7 makes a correction to the provisions for terminating action for inspections required by Boeing SB 747-53-2272.  Compliance with Revision 18 or later revisions of this service bulletin approved by FAA AMOC, cancels the inspections per Requirements 1 and 2, together with Requirements 5 through Requirement 9 (inclusive) of this Directive for the modified areas only.

             Explanation of changes and additions introduced by previous amendment (Amendment 6).

             Amendment 6 restructured this AD by combining the requirements of the previous amendment of this AD with the requirements of AD/B747/324 and the new FAA AD 2005-08-01.

   The new FAA AD 2005-08-01 adds extra inspections, expands inspection areas and removes a one-time deferral of an inspection.  This AD is prompted by reports of large cracks common to fuselage frames in the upper deck area, and severed or nearly severed adjacent frames, which if undetected, could lead to structural failure and cabin decompression.

David Villiers
Delegate of the Civil Aviation Safety Authority

19 June 2007