{"id":"F2006B05059","name":"AD/CESSNA 180/46 - Horizontal Stabiliser Rear Spar Flange","slug":"ad-cessna-180-46-horizontal-stabiliser-rear-spar-flange","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44969,"registerId":"commonwealth-F2006B05059-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 180/46 - Horizontal Stabiliser Rear Spar Flange","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 180, 182 and Wren 460 Series Aeroplanes\n\n \n\nAD/CESSNA 180/46 Horizontal Stabiliser Rear Spar Flange 7/77\n\nApplicability: All model 182 with S/Nos. listed in Requirement document. Requirement:  Action in accordance with Cessna SL SE77-11.\n\nCompliance: Within 100 hours time in service after 31 July 1977.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a vintage 1977 airworthiness directive that remains in its original narrow form. It addresses a specific structural defect in specific aircraft models and has not expanded beyond this original safety purpose. The scope remains tightly constrained to the horizontal stabiliser rear spar flange issue identified in Cessna Service Letter SE77-11."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","Single defined reference (Cessna SL SE77-11) with no excerpted technical details","Simple binary applicability test (serial number match)","Single compliance deadline with clear time-in-service metric","No nested exceptions, conditional logic, or cross-references to other legislation","Minimal defined terms — relies entirely on external manufacturer document"],"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 182 aeroplanes** (and potentially related models) to inspect or repair the **horizontal stabiliser rear spar flange** — a critical structural component at the back of the aircraft that helps keep the plane stable in flight.\n\n**Who it affects:**\n- Owners and operators of Cessna 182 aircraft with specific serial numbers listed in Cessna Service Letter SE77-11\n- The directive also references Cessna 180 and Wren 460 series in the heading, though the applicability clause narrows it to specific 182 models\n\n**What must be done:**\n- Follow the instructions in **Cessna Service Letter SE77-11** (a technical bulletin from the manufacturer)\n- Complete the work **within 100 hours of flight time** after 31 July 1977\n\n**Why it matters:**\nStructural failures in the tail section can cause catastrophic loss of control. This AD addresses a known defect before it causes accidents. Non-compliance means the aircraft cannot legally fly in Australian airspace."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD, as presented, sets a narrow, specific scope: model 182 aircraft with serial numbers listed in the Requirement document must comply with Cessna SL SE77-11 within 100 hours time-in-service after 31 July 1977. The text does not indicate any amendment or expansion of scope from that apparent original requirement, so there is no evidence in the provided instrument that the scope has changed."},"complexity_factors":["Relies on an external manufacturer document (Cessna SL SE77-11) for the technical steps, increasing implementation dependency and requiring access to that document (Requirement).","Applicability is limited to specific serial numbers listed in a separate Requirement document, requiring a cross-check to determine whether an individual aircraft is affected (Applicability).","Compliance is expressed as a time-in-service window tied to a calendar date (100 hours after 31 July 1977), which creates scheduling and counting requirements (Compliance).","The AD text does not include technical detail, cost estimates, certification or enforcement information, creating informational gaps implementers must resolve from other sources (Requirement; Compliance).","Historical dating (1977) may complicate practical interpretation or record retrieval for aircraft owners and maintainers."],"plain_english_summary":"This AD mandates owners/operators of the specific Cessna 182 airframes listed in the Requirement document to perform the actions set out in Cessna Service Letter SE77-11, and to complete that work within 100 hours time-in-service after 31 July 1977.  \n\nIt matters because the regulator makes the requirement mandatory, costs and scheduling fall to the owner/operator, and the AD delegates all technical detail to the manufacturer’s Service Letter."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-180-46-horizontal-stabiliser-rear-spar-flange","history":"/api/acts/ad-cessna-180-46-horizontal-stabiliser-rear-spar-flange/history","analysis":"/api/acts/ad-cessna-180-46-horizontal-stabiliser-rear-spar-flange/analysis","conflicts":"/api/acts/ad-cessna-180-46-horizontal-stabiliser-rear-spar-flange/conflicts","importantCases":"/api/acts/ad-cessna-180-46-horizontal-stabiliser-rear-spar-flange/important-cases","documents":"/api/acts/ad-cessna-180-46-horizontal-stabiliser-rear-spar-flange/documents"}}