Document ID: chunk:federal_register_of_legislation:F2007L00122:body:0:p3
Version: federal_register_of_legislation:F2007L00122
Segment Type: other
Provision Reference: 
Character Range: 5993–8832

not previously affected by FAA AD 2002-26-05, within 10 hours time in service after 15 February 2007, unless already accomplished.

                        Requirement 7: Upon reaching the safe life specified in Requirement 1 or as re-calculated in Requirement 4, as applicable.  If, as of the time of logbook entry as required by Requirement 6, the aircraft wing lower spar cap(s) is/are over or within 50 hours of the safe life, an additional 50 hours time in service is allowed to accomplish the replacement /modification.

                        Requirement 8: As specified in the inspection schedule included as part of the AMOC in Appendix 2.

                        Requirement 9: Before the accumulation of 2,000 hours time in service or within 100 hours time in service after 15 February 2007, whichever occurs later.

             The initial compliance time for Requirement 6 remains unchanged by this issue of the Directive.
             This Amendment becomes effective on 15 February 2007.

Background:  This Directive lowered the safe life for the wing lower spar cap for affected aircraft that was established in AD/AT/20, and further reduced the safe life for aircraft that incorporate or have incorporated Marburger Enterprises Inc. winglets.  This Directive also requires an eddy current inspection immediately prior to the replacement/modification to detect and correct any crack in a bolt hole before it extends to the modified centre section of the wing.  This Directive is the result of reports the FAA received of cracks originating in the outboard 3/8-inch hole of the main spar lower cap on affected aircraft at times lower than the established safe life.

             Amendment 1 further reduced the safe life of the Models AT-502, AT-502B, and
             AT-503A aircraft, and added aircraft recently manufactured to the applicability of this Directive.

             Amendment 2 allowed the use of an AMOC which involves the use of inspections and modifications and a new extended retirement life (8,000 Hours TTIS), in lieu of the safe lives specified in this AD.

             Amendment 3 is issued in response to a new FAA AD.  Since the issue of FAA AD 2002-26-05 (AD/AT/21) and 2002-11-05 R1 (AD/AT/20), apart from retaining the actions of these Directives, the FAA determined that additional aircraft should be added to the applicability section and also determined the safe life for new production aircraft and replacement spar caps should be extended.  The FAA also developed an AMOC to the requirements of 2006-24-10 (this Directive).  This Directive incorporates the requirements of AD/AT/20 Amdt 4.

             The original issue of this Airworthiness Directive became effective on 10 July 2002.

David Villiers
Delegate of the Civil Aviation Safety Authority

4 January 2007