{"id":"F2007L04230","name":"AD/B747/365 - Centre and Outer Wing Fuel Tanks","slug":"ad-b747-365-centre-and-outer-wing-fuel-tanks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":70439,"registerId":"commonwealth-F2007L04230-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/B747/365 | Centre and Outer Wing Fuel Tanks | 12/2007 |\n| ----------- | -------------------------------- | ------- |\n\n| Applicability: | Model 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400,747-400D, 747-400F and 747SP series aeroplanes, as identified in Boeing Special Attention Service Bulletin (SB) 747-57-2327, Revision 1, dated 10 July 2006 and Boeing Special Attention SB 747-57-2326, dated 4 January 2007.                                                                                                              |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Reconfigure the wire bundle clamps and seal the ends of certain fasteners inside the auxiliary fuel tank, main fuel tanks and surge fuel tanks, in accordance with the Accomplishment Instructions of Special Attention SB 747-57-2327, Revision 1.                                                                                                                                                         |\n|                | 2. Seal the ends of certain fasteners inside the main fuel tanks, in accordance with the Accomplishment Instructions of Special Attention SB 747-57-2326.                                                                                                                                                                                                                                                      |\n|                | Later revisions of the above SBs, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2007-20-01, are considered acceptable for compliance with the equivalent Requirements of this Directive.                                                                                                                                           |\n|                | Note: FAA AD 2007-20-01 Amdt 39-15211 refers.                                                                                                                                                                                                                                                                                                                                                                  |\n| Compliance:    | For Requirements 1 and 2 - Within 60 months after the effective date of this Directive.                                                                                                                                                                                                                                                                                                                        |\n|                | This Airworthiness Directive becomes effective on 22 November 2007.                                                                                                                                                                                                                                                                                                                                            |\n| Background:    | This Directive requires reconfiguring the clamps of certain wire bundles and applying insulating sealant to certain fasteners inside the fuel tanks. The Directive results from fuel system reviews conducted by the manufacturer and is issued to prevent arcing inside the fuel tanks in the event of a lightning strike or high-powered short circuit, which could result in a fuel tank explosion or fire. |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n2 October 2007","sortOrder":0},{"sectionNumber":"AD/B747/365","sectionType":"part","heading":"AD/B747/365","content":"## AD/B747/365","sortOrder":1},{"sectionNumber":"Centre and Outer Wing Fuel Tanks","sectionType":"part","heading":"Centre and Outer Wing Fuel Tanks","content":"## Centre and Outer Wing Fuel Tanks","sortOrder":2},{"sectionNumber":"12/2007","sectionType":"part","heading":"12/2007","content":"## 12/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The Directive applies to the specific Boeing 747 models identified by the cited service bulletins and requires the modifications described; it tracks and aligns with FAA AD 2007-20-01 and accepts FAA-approved SB revisions as alternate compliance methods. The text contains no provision that narrows or expands that applicability beyond the service-bulletin and FAA-AD references (see Applicability; Requirement; Note; Compliance)."},"complexity_factors":["Technical work inside fuel tanks requiring access, confined-space and fuel-system procedures and specialised tools/skills (Requirement: reconfigure clamps and seal fasteners).","Cross-references to multiple Boeing Special Attention Service Bulletins with specific revisions and acceptability of later FAA-approved revisions (Applicability; Requirement: later revisions acceptable as FAA AMOC).","Inter-jurisdictional compliance alignment with FAA AD 2007-20-01, creating reliance on foreign authority for AMOCs (Note and Requirement referencing FAA AD).","A single 60-month compliance window for all affected tasks creates scheduling and aircraft-availability trade-offs for operators (Compliance: within 60 months).","Wide model applicability as identified by SBs increases coordination complexity for fleet operators (Applicability: list of 747 variants and SB identification)."],"plain_english_summary":"This directive orders operators of specified Boeing 747 models to modify fuel-tank internals: reconfigure certain wire-bundle clamps and seal the ends of particular fasteners inside centre, main and surge tanks, following Boeing service bulletins. The Civil Aviation Safety Authority requires completion within 60 months to reduce the risk of arcing inside fuel tanks (e.g. from lightning or short circuits), which the directive says could lead to fire or explosion. Operators bear the cost and downtime of the inspections and modifications."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific safety issue identified through manufacturer fuel system reviews. The scope remains precisely limited to the identified wiring and fastener sealing issues in the specified fuel tank locations. There is no evidence of scope creep; the instrument performs exactly the safety function it was designed for."},"complexity_factors":["Short, single-purpose directive with only 2 technical requirements","Minimal defined terms (relies on external Boeing Service Bulletins for technical specifications)","One conditional provision allowing FAA-approved alternative compliance methods","Simple temporal compliance structure (single deadline, no phased implementation)","No nested exceptions or complex cross-referencing within the instrument itself (though it references external technical documents)","Clear applicability table identifying specific aircraft models by reference to manufacturer documentation"],"plain_english_summary":"This CASA Airworthiness Directive requires operators and maintenance organisations of certain Boeing 747 variants (‑100/200/300/400 and SP series) to modify and seal fuel‑tank wiring and fasteners to eliminate arcing risks that could cause tank fire or explosion. Work must be completed within 60 months of 22 Nov 2007; later Boeing procedures are allowed if FAA‑approved."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-365-centre-and-outer-wing-fuel-tanks","history":"/api/acts/ad-b747-365-centre-and-outer-wing-fuel-tanks/history","analysis":"/api/acts/ad-b747-365-centre-and-outer-wing-fuel-tanks/analysis","conflicts":"/api/acts/ad-b747-365-centre-and-outer-wing-fuel-tanks/conflicts","importantCases":"/api/acts/ad-b747-365-centre-and-outer-wing-fuel-tanks/important-cases","documents":"/api/acts/ad-b747-365-centre-and-outer-wing-fuel-tanks/documents"}}