{"id":"F2005L00583","name":"AD/B747/325 - Post Nacelle Strut Modification Inspections","slug":"ad-b747-325-post-nacelle-strut-modification-inspections","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":112821,"registerId":"commonwealth-F2005L00583-current","compilationNumber":null,"startDate":"2026-04-03","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/B747/325 | Post Nacelle Strut Modification Inspections | 4/2005 |\n| ----------- | ------------------------------------------- | ------ |\n\n| Applicability: | All Model 747 series aircraft.                                                                                                                                                                                                                                   |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2005-03-01 Amdt 39-13957.Note: Boeing Alert Service Bulletin 747-54A2182, or later FAA approved revision refers.                                                                                  |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of 14 April 2005.                                                                                                                                                                        |\n|                | This Airworthiness Directive becomes effective on 14 April 2005.                                                                                                                                                                                                 |\n| Background:    | This Directive requires repetitive inspections of the nacelle strut-to-wing attachment structure, and repetitive overhaul of the diagonal brace and spring beam load paths, to maintain damage tolerance requirements and ensure long term structural integrity. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n2 March 2005","sortOrder":0},{"sectionNumber":"AD/B747/325","sectionType":"part","heading":"AD/B747/325","content":"## AD/B747/325","sortOrder":1},{"sectionNumber":"Post Nacelle Strut Modification Inspecti","sectionType":"part","heading":"Post Nacelle Strut Modification Inspections","content":"## Post Nacelle Strut Modification Inspections","sortOrder":2},{"sectionNumber":"4/2005","sectionType":"part","heading":"4/2005","content":"## 4/2005","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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a narrow, specific scope — addressing a particular structural inspection requirement for one aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 defined term implicitly referenced (Model 747 series aircraft)","No nested conditional logic or exceptions","Single cross-reference to external FAA AD and Boeing Service Bulletin","Straightforward compliance requirement: follow the US FAA directive","No internal definitions section or interpretation clauses"],"plain_english_summary":"This CASA Airworthiness Directive mandates repeated inspections of the nacelle strut-to-wing attachment and periodic overhauls of the diagonal brace and spring beam load paths on all Boeing 747s in Australia. It aims to detect cracks early and preserve structural damage tolerance, aligning Australian operators with the FAA directive and Boeing service instructions. Compliance has been mandatory since 14 April 2005."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope remains focused on post‑modification inspection and overhaul of the nacelle strut‑to‑wing attachment and associated load paths for all Model 747s, as set out in the Requirement and Applicability. The instrument adopts the FAA technical mandate without expanding affected parts, operators, or actions beyond those referenced."},"complexity_factors":["Cross-reference to external FAA AD 2005-03-01 and Boeing Alert Service Bulletin 747-54A2182 — requires operators to follow external technical documents (Requirement).","Applicability to all Model 747 series — broad fleet coverage increases aggregate compliance workload (Applicability).","Repetitive inspections and repetitive overhauls — creates ongoing, scheduled maintenance obligations rather than a one-off fix (Requirement; Background).","Compliance timing and legal effect set by CASA with a revised effective date — administrative scheduling and enforcement responsibilities (Compliance).","Technical maintenance tasks (strut‑to‑wing attachment, diagonal brace, spring beam) may require specialised labour and shop access, increasing logistical complexity (Background)."],"plain_english_summary":"This directive requires operators of all Boeing 747 series to perform repetitive inspections of the nacelle strut‑to‑wing attachment structure and repetitive overhauls of the diagonal brace and spring beam load paths, following the technical requirements of FAA AD 2005‑03‑01 (Requirement). It is effective 14 April 2005; CASA enforces compliance by mandating the FAA‑referenced procedures, and operators bear the inspection and overhaul costs and scheduling burden (Compliance; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-325-post-nacelle-strut-modification-inspections","history":"/api/acts/ad-b747-325-post-nacelle-strut-modification-inspections/history","analysis":"/api/acts/ad-b747-325-post-nacelle-strut-modification-inspections/analysis","conflicts":"/api/acts/ad-b747-325-post-nacelle-strut-modification-inspections/conflicts","importantCases":"/api/acts/ad-b747-325-post-nacelle-strut-modification-inspections/important-cases","documents":"/api/acts/ad-b747-325-post-nacelle-strut-modification-inspections/documents"}}