{"id":"F2006B07075","name":"AD/SM-260/16 - Wing Main Spar Web","slug":"ad-sm-260-16-wing-main-spar-web","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48834,"registerId":"commonwealth-F2006B07075-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SM-260/16 - Wing Main Spar Web","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nSIAI Marchetti 260 Series Aeroplanes\n\nAD/SM-260/16 Wing Main Spar Web 6/87\n\nApplicability: All model F260, F260B, F260C and F260D with Serial Numbers up to and including 735.\n\nRequirement: Action in accordance with SIAI Marchetti Service Bulletin No. 260-B50.\n\nNote: RAI AD 86-199/F260-32 refers.\n\nCompliance: 1. Initial Inspection.\n\n    (a) For aircraft which have achieved less than 1000 hours time in service as at 4 June 1987 - Prior to exceeding 1000 hours time in service or within 500 hours time in service after 4 June 1987, whichever is the later.\n\n    (b) For aircraft which have achieved 1000 or more hours time in service as at 4 June 1987, but less than 3000 hours - Within 500 hours time in service after 4 June 1987 or prior to exceeding 3100 hours, whichever is the sooner.\n\n    (c) For aircraft which have achieved 3000 or more hours time in service as at 4 June 1987 - Within 100 hours time in service after 4 June 1987.\n\n2. Repeat Inspections. For all aircraft, repeat the inspections at intervals not exceeding 500 hours time in service until modified in accordance with the Requirement Document.\n\nBackground: This Directive introduces an inspection for cracks in the wing main spar web.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused specifically on wing spar web inspections for one aircraft series. It has not expanded beyond its original purpose."},"complexity_factors":["Multiple conditional compliance deadlines based on aircraft flight hours (three separate brackets with 'whichever is the later/sooner' logic)","Cross-reference to external technical document (SIAI Marchetti Service Bulletin No. 260-B50) without reproducing its contents","Reference to related foreign airworthiness directive (RAI AD 86-199/F260-32) without explanation","Temporal anchor date (4 June 1987) creates calculation burden for operators","Dual compliance structure (initial + repeating inspections until modification)"],"plain_english_summary":"This mandatory CASA airworthiness directive orders owners/operators of SIAI Marchetti F260/F260B/C/D aircraft (serials 735 and below) to inspect the wing main spar web for cracks and carry out recurring inspections until a permanent repair is fitted. It targets aircraft at risk of wing structural failure, with inspection timing scaled to historical flight hours so higher‑used aeroplanes are inspected sooner to prevent catastrophic failure."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope aligns with its stated purpose in the text: it applies to SIAI Marchetti F260/F260B/F260C/F260D aircraft up to serial 735 and introduces inspections for cracks in the wing main spar web per the Service Bulletin. The AD does not broaden or narrow that applicability beyond the instrument's own terms."},"complexity_factors":["Tiered initial compliance windows tied to aircraft time-in-service (multiple conditional deadlines).","Mandatory repeat inspections at fixed intervals (every 500 hours) until modification completed.","Applicability limited to specific models and serial-number range (identification and tracking required).","Dependence on an external Requirement Document (SIAI Marchetti Service Bulletin No. 260-B50) to define the corrective modification.","Operational impact varies with utilisation rates (high-use aircraft face more frequent inspections).","Inspections for cracks may require specialised inspection techniques or skilled maintenance personnel."],"plain_english_summary":"This airworthiness directive requires operators of SIAI Marchetti F260 series aeroplanes (serial numbers up to and including 735) to inspect the wing main spar web for cracks and to follow SIAI Marchetti Service Bulletin No. 260-B50. \n\nIt sets staged initial deadlines based on aircraft hours and mandates repeat inspections every 500 hours until the modification in the Service Bulletin is completed, so operators carry inspection and modification costs and must schedule recurring maintenance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sm-260-16-wing-main-spar-web","history":"/api/acts/ad-sm-260-16-wing-main-spar-web/history","analysis":"/api/acts/ad-sm-260-16-wing-main-spar-web/analysis","conflicts":"/api/acts/ad-sm-260-16-wing-main-spar-web/conflicts","importantCases":"/api/acts/ad-sm-260-16-wing-main-spar-web/important-cases","documents":"/api/acts/ad-sm-260-16-wing-main-spar-web/documents"}}