{"id":"F2006B09513","name":"AD/EMB-120/26 - Wing-to-Fuselage Fittings","slug":"ad-emb-120-26-wing-to-fuselage-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54084,"registerId":"commonwealth-F2006B09513-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EMB-120/26 - Wing-to-Fuselage Fittings","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Embraer EMB-120 (Brasilia) Series Aeroplanes\n\n \n\nAD/EMB-120/26 Wing-to-Fuselage Fittings 3/99\n\nApplicability: All Model EMB-120 aircraft that have accumulated more than 4,000 flight cycles. Requirement:               Perform a detailed visual inspection in accordance with Embraer Service Bulletin\n\n120-57-0034 Revision 1. Results of the inspection to be forwarded to Embraer.\n\n \n\nNote: CTA AD 1999-01-01 Amdt 39-845 refers.\n\n \n\nCompliance: Unless already accomplished, within 400 flight cycles after 25 March 1999.\n\n \n\nThis Airworthiness Directive becomes effective on 25 March 1999.\n\n \n\nBackground: The CTA received reports of cracks in the fuselage attachment area of the wing-to- fuselage fittings on two aircraft, and requires an evaluation of the “Brasilia” fleet.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific structural defect in a specific aircraft model. It has not expanded beyond its original purpose of mandating inspections for cracked wing-to-fuselage fittings."},"complexity_factors":["Single, unambiguous applicability criterion (4,000+ flight cycles)","One clear compliance action (visual inspection per specified service bulletin)","Simple deadline structure (400 flight cycles from effective date)","No nested exceptions, conditional logic, or alternative compliance methods","Only one defined reference (Embraer Service Bulletin 120-57-0034 Rev 1)","Total length: approximately 150 words of substantive content"],"plain_english_summary":"This CASA Airworthiness Directive orders operators of Embraer EMB-120 Brasilia aircraft with over 4,000 takeoff‑and‑landing cycles to perform the detailed visual inspection of wing‑to‑fuselage fittings per Embraer Service Bulletin 120‑57‑0034 Rev 1 and to report results to Embraer.  \n\nIt responds to cracks found in that critical structural fitting that could cause wing separation; inspections were required within 400 flight cycles after 25 March 1999."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive's scope does not appear to broaden or narrow compared to its stated purpose: it addresses reported cracks by requiring inspection and reporting for aircraft above a defined cycle threshold. The AD prescribes who must act (operators/maintenance organisations), what to do ('detailed visual inspection' per Embraer Service Bulletin 120-57-0034 Revision 1), when to comply (within 400 flight cycles after 25 March 1999), and to whom to report (results forwarded to Embraer). Operators bear the inspection and reporting costs and must interpret and apply the Service Bulletin; the AD itself does not mandate specific repairs, leaving subsequent decisions to the manufacturer’s guidance and follow-up actions."},"complexity_factors":["Narrow applicability: only EMB-120 aircraft with >4,000 flight cycles (Applicability line).","Prescriptive action: requires a 'detailed visual inspection' using a specific Embraer Service Bulletin (Requirement line).","Reporting obligation: inspection results must be forwarded to Embraer (Requirement line), adding recordkeeping and information-flow burden.","Fixed compliance deadline: within 400 flight cycles after 25 March 1999 (Compliance line), creating a clear timeline for operators.","No mandatory corrective actions stated in the AD beyond inspection and reporting, leaving follow-up measures contingent on findings and manufacturer guidance (Requirement + Background).","Cross-reference to another authority document (CTA AD 1999-01-01 Amdt 39-845) introduces an external compliance linkage (Note line)."],"plain_english_summary":"This Airworthiness Directive requires operators of Embraer EMB-120 aircraft that have done more than 4,000 flight cycles to carry out a detailed visual inspection of the wing-to-fuselage fittings, following Embraer Service Bulletin 120-57-0034 Revision 1, and to forward the inspection results to Embraer. It is aimed at detecting reported cracks in the fuselage attachment area and must be completed within 400 flight cycles after 25 March 1999."}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-120-26-wing-to-fuselage-fittings","history":"/api/acts/ad-emb-120-26-wing-to-fuselage-fittings/history","analysis":"/api/acts/ad-emb-120-26-wing-to-fuselage-fittings/analysis","conflicts":"/api/acts/ad-emb-120-26-wing-to-fuselage-fittings/conflicts","importantCases":"/api/acts/ad-emb-120-26-wing-to-fuselage-fittings/important-cases","documents":"/api/acts/ad-emb-120-26-wing-to-fuselage-fittings/documents"}}