{"id":"F2009L01495","name":"AD/B747/380 Amdt 2 - External Skin Doublers","slug":"ad-b747-380-amdt-2-external-skin-doublers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78097,"registerId":"commonwealth-F2009L01495-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/B747/380 Amdt 2 | External Skin Doublers | 5/2009 |\n| ------------------ | ---------------------- | ------ |\n\n| Applicability: | Model 747-100, -100B, -200B, -200C, -200F, -300, 747SR, and 747SP series aircraft as identified in Boeing Alert Service Bulletin 747-53A2748 dated 9 May 2008, or later FAA approved revision.                                                                                                                                                                                                                                               |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2009-04-16 Amdt 39-15822.                                                                                                                                                                                                                                                                                                                                                     |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of7 May 2009.                                                                                                                                                                                                                                                                                                                                                        |\n|                | This Amendment becomes effective on 7 May 2009.                                                                                                                                                                                                                                                                                                                                                                                              |\n| Background:    | The FAA received a report of cracked fastener holes at the right S-6 lap splice between STA 340 and STA 380. Undetected cracking in the fuselage skin could result in rapid decompression and loss of structural integrity.Amendment 1 included the referenced ASB in applicability to identify specifically affected aircraft.Amendment 2 is issued in response to a new FAA AD, which mandates the previously optional terminating action. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n26 March 2009","sortOrder":0},{"sectionNumber":"AD/B747/380 Amdt 2","sectionType":"part","heading":"AD/B747/380 Amdt 2","content":"## AD/B747/380 Amdt 2","sortOrder":1},{"sectionNumber":"External Skin Doublers","sectionType":"part","heading":"External Skin Doublers","content":"## External Skin Doublers","sortOrder":2},{"sectionNumber":"5/2009","sectionType":"part","heading":"5/2009","content":"## 5/2009","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Yes. Amendment 2 expands the regulatory obligation by adopting a new FAA AD that \"mandates the previously optional terminating action\" (Background). Amendment 1 had already narrowed applicability by citing Boeing ASB 747-53A2748; Amendment 2 imposes the mandatory terminating action and sets the effective date as 7 May 2009 (Applicability; Background; Compliance)."},"complexity_factors":["Cross-reference to an external FAA AD (FAA AD 2009-04-16 Amdt 39-15822) — compliance depends on another regulator's normative text (Requirement).","Reliance on a manufacturer service bulletin (Boeing Alert Service Bulletin 747-53A2748 dated 9 May 2008) to identify affected airframes (Applicability).","Technical nature of the defect and remedy (cracked fastener holes at right S-6 lap splice; installation of external skin doublers or terminating action) increases specialised engineering and maintenance workload (Background, Requirement).","Change in legal obligation: an action that was previously optional is now mandated by the new FAA AD, altering compliance choices and timelines (Background).","Multiple affected model variants (several 747 series models listed) creates fleet-wide planning and parts logistics considerations (Applicability).","Revised effective date and formal adoption by CASA (effective 7 May 2009) imposes a clear compliance deadline for operators (Compliance, effective date).","Operational and financial burden falls on operators/owners (implied by the need to perform inspections/repairs under the Requirement and Applicability)."],"plain_english_summary":"This instrument requires operators of specified Boeing 747 models to carry out the technical actions set out in FAA Airworthiness Directive 2009-04-16 and the referenced Boeing Alert Service Bulletin to fix cracked fastener holes at the right S‑6 lap splice, and it makes the previously optional terminating action mandatory. Operators/owners must arrange and fund the inspections and repairs; the Civil Aviation Safety Authority (via its delegate) adopted the FAA AD and set the effective date as 7 May 2009."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original scope as a targeted safety order for specific Boeing 747 fuselage repairs. Amendment 2 tightens requirements by making previously optional actions mandatory, but this represents intensification of the original safety purpose rather than scope creep."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 1 defined term implicitly referenced (the Boeing Service Bulletin)","No nested conditional logic or exceptions","Single cross-reference to external FAA document rather than internal legislative structure","Straightforward applicability table format","No interpretative provisions or deeming clauses"],"plain_english_summary":"This AD requires owners and operators of certain Boeing 747 series identified in Boeing Alert Service Bulletin 747‑53A2748 to inspect and repair the external fuselage skin at the S‑6 lap splice to detect and fix cracked fastener holes, and it makes previously optional terminating repairs mandatory. The action prevents crack growth that could lead to rapid decompression or structural failure, strengthening safety for the affected aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-380-amdt-2-external-skin-doublers","history":"/api/acts/ad-b747-380-amdt-2-external-skin-doublers/history","analysis":"/api/acts/ad-b747-380-amdt-2-external-skin-doublers/analysis","conflicts":"/api/acts/ad-b747-380-amdt-2-external-skin-doublers/conflicts","importantCases":"/api/acts/ad-b747-380-amdt-2-external-skin-doublers/important-cases","documents":"/api/acts/ad-b747-380-amdt-2-external-skin-doublers/documents"}}