{"id":"F2006B05108","name":"AD/CESSNA 185/18 - Wing Strut Attachment Strap","slug":"ad-cessna-185-18-wing-strut-attachment-strap","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45092,"registerId":"commonwealth-F2006B05108-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 185/18 - Wing Strut Attachment Strap","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)  Cessna 185 Series Aeroplanes\n\n \n\nAD/CESSNA 185/18 Wing Strut Attachment Strap 9/73\n\nApplicability: All model 185 with S/Nos. 18502199 to 18502238. Requirement:  Action in accordance with Cessna SL SE73-20.\n\nCompliance: Within 100 hours time in service after 24 September 1973.\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\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive as presented applies only to Cessna 185 aeroplanes with serial numbers 18502199 to 18502238 and requires action in accordance with Cessna Service Letter SE73-20 within a specified time-in-service. The text contains no indication that the scope has been expanded or narrowed beyond that specification."},"complexity_factors":["Narrow applicability limited to a specific range of serial numbers (Applicability).","Mandates compliance by reference to an external manufacturer service letter rather than prescribing technical steps directly (Requirement).","Compliance timeframe specified by hours time-in-service after a fixed date, requiring owners to calculate remaining allowable hours (Compliance).","Regulatory enforcement sits within the Civil Aviation Regulations Part 39 framework, requiring coordination between operator, maintenance provider and regulator (header)."],"plain_english_summary":"This airworthiness directive from CASA mandates that owners/operators of Cessna 185 aeroplanes (serials 18502199–18502238) must carry out the work specified in Cessna Service Letter SE73-20 on the wing strut attachment strap within 100 hours time-in-service after 24 September 1973. Compliance (arranged and paid by the owner/operator) is enforced under Part 39 of the Civil Aviation Regulations."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific manufacturing defect in a limited production run of aircraft. It has not expanded beyond its original purpose of mandating a particular structural inspection/repair."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","Zero defined terms in the directive itself (relies entirely on external reference to Cessna Service Letter SE73-20)","Simple conditional logic: single applicability criterion (specific serial number range) triggers single requirement","No nested exceptions, cross-references to other legislation, or procedural sub-conditions","External technical compliance delegated to manufacturer service letter (common aviation practice, but means substantive complexity lives outside this instrument)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Cessna 185 aeroplanes** (serial numbers 18502199 to 18502238) to inspect or repair the **wing strut attachment strap** — a critical structural component that connects the wing support strut to the fuselage. If this strap fails, the wing could detach in flight.\n\n**Who must comply:**\nAnyone who owns or operates a Cessna 185 with those specific serial numbers.\n\n**What they must do:**\nFollow the instructions in **Cessna Service Letter SE73-20** (a technical bulletin from the manufacturer) to inspect and fix any problems with the wing strut attachment strap.\n\n**When:**\nWithin **100 hours of flying time** after 24 September 1973.\n\n**Why it matters:**\nThis directive addresses a potentially catastrophic structural defect. Non-compliance means the aircraft cannot legally fly in Australian airspace — it's grounded until fixed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-185-18-wing-strut-attachment-strap","history":"/api/acts/ad-cessna-185-18-wing-strut-attachment-strap/history","analysis":"/api/acts/ad-cessna-185-18-wing-strut-attachment-strap/analysis","conflicts":"/api/acts/ad-cessna-185-18-wing-strut-attachment-strap/conflicts","importantCases":"/api/acts/ad-cessna-185-18-wing-strut-attachment-strap/important-cases","documents":"/api/acts/ad-cessna-185-18-wing-strut-attachment-strap/documents"}}