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AD/B747/392 Amdt 2 - Fuselage Upper Lobe Doubler
Boeing 747 Series AeroplanesBoeing 747 Series Aeroplanes
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Boeing 747 Series Aeroplanes
| AD/B747/392 Amdt 2 | Fuselage Upper Lobe Doubler | 11/2011 |
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| Applicability: | Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, 747SR and 747SP series aircraft; as identified in Boeing Alert Service Bulletin747-53A2651, dated 12 June 2008, or later FAA approved revision. |
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| Requirement: | Action in accordance with the requirements of FAA AD 2009-09-08 Amdt 39-15894.The inspections and corrective actions with the corresponding compliance times specified in Tables 1 and 2, under paragraph 1.E. “Compliance”, of Service Bulletin 747-53A2651, Revision 1, dated 2 September 2010 are an Alternative Method of Compliance (AMOC) to the inspections and corrective actions with the corresponding compliance times specified in Table 1, paragraph 1.E. “Compliance” of Service Bulletin 747-53A2651, dated June 12, 2008, as required by paragraphs (f) and (g) of FAA AD 2009-09-08.There is no requirement to obtain an exclusion from CASA for this AMOC.When this service bulletin specifies contacting Boeing for repair instructions, the repair instructions must be approved in accordance with paragraph (j) of the FAA AD.All other requirements of FAA AD 2009-09-08 remain fully applicable and must be complied with.2. Other corrective actions (repairs) that are on an FAA form 8100-9 and approved in accordance with the procedures specified in paragraph (j) of FAA AD2009-09-08, as an AMOC to the requirements of FAA AD 2009-09-08, may be carried out without the need to obtain an exclusion from CASA from this airworthiness directive. |
| Compliance: | As specified in paragraph 1.E. “Compliance” (Table 1 and 2) of Boeing S/B747-53A2651 Rev 1, dated 2 September 2010 and as per FAA AD 2009-09-08 as applicable. |
| This Amendment becomes effective on 25 May 2011. |
| Background: | The FAA received reports of cracks in the radius detail of the fuselage upper lobe doublers. Such cracking, unless detected and corrected, could result in significant degradation of the fuselage structure and reduce its ability to carry flight loads from the vertical stabiliser, which could adversely affect the controllability of the aircraft.This amendment is to allow the use of Revision 1 of Boeing Service Bulletin747-53A2651 as an Alternative Method of Compliance (AMOC) and to allow FAA form 8100-9 approved repairs, without the need for a CASA Exclusion. There is some change to the requirements and compliance and these are specified in Paragraph 1E of Boeing Service Bulletin 747-53A2651, Rev 1, dated 2 September 2010.Amendment 2 is to correct some wording in Requirement 1. There is no change to the intent of the requirements or compliance.Amendment 1 of this Airworthiness Directive became effective on 20 May 2011.The original issue of this Airworthiness Directive became effective on 2 July 2009. |
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