{"id":"F2006B05013","name":"AD/CESSNA 177/19 - Air Filter Seal","slug":"ad-cessna-177-19-air-filter-seal","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44923,"registerId":"commonwealth-F2006B05013-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 177/19 - Air Filter Seal","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 177 Series Aeroplanes\n\n \n\nAD/CESSNA 177/19 Air Filter Seal 5/75\n\nApplicability: All models listed in SL SE75-3.\n\n \n\nRequirement: Action in accordance with Cessna SL SE75-3.\n\n \n\nNote: FAA AD 75-07-02 refers.\n\n \n\nCompliance: Within 100 hours time in service after 30 May 1975.\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 discrete, single-issue Airworthiness Directive from 1975 addressing a specific technical defect (air filter seal) in a specific aircraft series (Cessna 177). It has not expanded beyond its original narrow scope."},"complexity_factors":["Extremely short document (under 200 words)","Only 4 substantive content lines (Applicability, Requirement, Note, Compliance)","No defined terms section — relies entirely on external reference (SL SE75-3)","Single, clear compliance condition (100 hours time in service after fixed date)","No nested exceptions or conditional logic","Cross-reference to one external document only (Cessna Service Letter SE75-3)"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety notice — issued by Australia's Civil Aviation Safety Authority (CASA) for Cessna 177 series aeroplanes.\n\n**What it does:** Requires owners and operators of these aircraft to take specific action regarding the air filter seal, following instructions in Cessna Service Letter SE75-3. This is a maintenance/safety fix to address a potential defect with the air filter seal.\n\n**Who it affects:** Anyone who owns or operates a Cessna 177 series aircraft (all models covered by Service Letter SE75-3).\n\n**Why it matters:** Airworthiness Directives are legally binding. If you don't comply, your aircraft is not considered airworthy and cannot legally fly. This particular directive addresses a specific technical issue with air filter seals that could affect engine performance or safety.\n\n**Key details:**\n- **Compliance deadline:** Within 100 hours of flight time after 30 May 1975\n- **Reference:** Also relates to FAA AD 75-07-02 (the US equivalent safety notice)\n- **Action required:** Follow Cessna Service Letter SE75-3 exactly"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD as published requires the actions set out in Cessna SL SE75-3 for all models listed in that service letter, with a specified compliance window. The instrument's scope is defined by that cross-reference and the stated compliance timeframe; there is no text indicating a change to that scope from any prior version within this document."},"complexity_factors":["Short, procedural AD text that omits technical steps and delegates detail to an external manufacturer service letter (Cessna SL SE75-3). (Requirement.)","Mandatory cross-reference to an FAA AD (FAA AD 75-07-02) creates inter-jurisdictional linkage that may require comparison of documents. (Note.)","Clear, single compliance deadline (100 hours after 30 May 1975) simplifies timing but imposes an operational scheduling constraint. (Compliance.)","Applicability is limited to models listed in the external service letter, so determining whether a specific aircraft is affected requires consulting SL SE75-3. (Applicability.)","Regulatory placement under Part 39 / Schedule of Airworthiness Directives identifies enforceability but the AD text provides no enforcement details or penalties."],"plain_english_summary":"This AD requires owners/operators of Cessna 177 models listed in Cessna Service Letter SE75-3 to perform the manufacturer’s Air Filter Seal actions in that service letter, completed within 100 flight hours after 30 May 1975. Compliance costs fall to the operator, and technical details are delegated to the Cessna service letter; the AD also notes a corresponding FAA AD."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-177-19-air-filter-seal","history":"/api/acts/ad-cessna-177-19-air-filter-seal/history","analysis":"/api/acts/ad-cessna-177-19-air-filter-seal/analysis","conflicts":"/api/acts/ad-cessna-177-19-air-filter-seal/conflicts","importantCases":"/api/acts/ad-cessna-177-19-air-filter-seal/important-cases","documents":"/api/acts/ad-cessna-177-19-air-filter-seal/documents"}}