{"id":"F2011L00849","name":"AD/B747/392 Amdt 2 - Fuselage Upper Lobe Doubler","slug":"ad-b747-392-amdt-2-fuselage-upper-lobe-doubler","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":86559,"registerId":"commonwealth-F2011L00849-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 747 Series Aeroplanes","sectionType":"division","heading":"Boeing 747 Series Aeroplanes","content":"### Boeing 747 Series Aeroplanes\n\n| AD/B747/392 Amdt 2 | Fuselage Upper Lobe Doubler | 11/2011 |\n| ------------------ | --------------------------- | ------- |\n\n| 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. |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| 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. |\n| 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. |\n| | This Amendment becomes effective on 25 May 2011. |\n\n| 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. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)\n\nMike Higgins \nDelegate of the Civil Aviation Safety Authority\n\n20 May 2011","sortOrder":0},{"sectionNumber":"AD/B747/392 Amdt 2","sectionType":"part","heading":"AD/B747/392 Amdt 2","content":"## AD/B747/392 Amdt 2","sortOrder":1},{"sectionNumber":"Fuselage Upper Lobe Doubler","sectionType":"part","heading":"Fuselage Upper Lobe Doubler","content":"## Fuselage Upper Lobe Doubler","sortOrder":2},{"sectionNumber":"11/2011","sectionType":"part","heading":"11/2011","content":"## 11/2011","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"Amendment 2 permits Boeing Service Bulletin 747-53A2651 Revision 1 as an Alternative Method of Compliance and allows FAA Form 8100-9 approved repairs without a CASA exclusion (Requirement). Background states Amendment 2 only corrects wording and that there is no change to the intent of the requirements or compliance (Background)."},"complexity_factors":["Cross-reference to external FAA AD and Boeing Service Bulletin (Requirement) — compliance depends on documents outside the instrument.","Multiple AMOC pathways: acceptance of SB Revision 1 as an AMOC and allowance of FAA Form 8100-9 approved repairs without CASA exclusion (Requirement) adds procedural choice and approval-tracking.","Need to comply with specified timing in Tables 1 and 2 of the service bulletin (Compliance) — scheduling and recordkeeping burden tied to external tables.","Requirement to use FAA/approved repair instructions where the service bulletin requires contacting Boeing, and reference to paragraph (j) of FAA AD for approval (Requirement) — introduces regulator-to-regulator approval steps.","Wide applicability across many 747 model variants (Applicability) — varied fleet states increase inspection/repair heterogeneity.","Amendment history and wording corrections (Background) — operators and maintainers must track which revision/AMOC applies.","Cross-jurisdiction coordination between CASA and FAA (Background/Requirement) — potential for differing interpretations and reliance on foreign approvals."],"plain_english_summary":"This directive requires operators of the listed Boeing 747 models to inspect and repair cracking in the fuselage upper-lobe doubler by following FAA AD 2009-09-08 and Boeing Service Bulletin 747-53A2651 Revision 1. Revision 1 is accepted as an alternative method of compliance and FAA Form 8100-9 approved repairs may be used without a CASA exclusion. Operators pay for inspections and repairs, must follow the service bulletin timing tables, and obtain Boeing/FAA‑approved repair instructions where the bulletin directs."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose — addressing fuselage upper lobe doubler cracks in Boeing 747 aircraft. Amendment 2 makes only technical wording corrections without expanding the scope. The directive has not grown beyond its original safety intent."},"complexity_factors":["Multiple nested document references: requires cross-referencing between CASA AD, FAA AD 2009-09-08, and Boeing Service Bulletin 747-53A2651 (original and Revision 1)","Conditional compliance pathways: distinguishes between original service bulletin requirements and Revision 1 as an Alternative Method of Compliance (AMOC)","Dual regulatory framework: incorporates US FAA requirements by reference with specific Australian modifications","Exception handling: specifies when CASA exclusions are and are not required for alternative repairs","Version control complexity: tracks Amendment 2 correcting Amendment 1, which amended the original 2009 directive"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires inspections and repairs for cracks in the fuselage upper-lobe doublers near the tail‑fin attachment on certain Boeing 747s (those covered by Boeing Service Bulletin 747‑53A2651). Left unaddressed, these cracks could weaken the structure that transmits loads from the vertical stabiliser and affect controllability.\n\nAmendment 2 makes only minor wording edits, and lets operators use Boeing SB Revision 1 and FAA‑approved repairs without separate CASA exclusions, reducing approval burden."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-392-amdt-2-fuselage-upper-lobe-doubler","history":"/api/acts/ad-b747-392-amdt-2-fuselage-upper-lobe-doubler/history","analysis":"/api/acts/ad-b747-392-amdt-2-fuselage-upper-lobe-doubler/analysis","conflicts":"/api/acts/ad-b747-392-amdt-2-fuselage-upper-lobe-doubler/conflicts","importantCases":"/api/acts/ad-b747-392-amdt-2-fuselage-upper-lobe-doubler/important-cases","documents":"/api/acts/ad-b747-392-amdt-2-fuselage-upper-lobe-doubler/documents"}}