{"id":"F2006B05215","name":"AD/CESSNA 206/10 - Exhaust Manifold Heat Exchanger","slug":"ad-cessna-206-10-exhaust-manifold-heat-exchanger","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45460,"registerId":"commonwealth-F2006B05215-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 206/10 - Exhaust Manifold Heat Exchanger","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 206 Series Aeroplanes\n\n \n\nAD/CESSNA 206/10 Exhaust Manifold Heat Exchanger 6/71\n\nApplicability: All model TU206 and TP206.\n\n \n\nRequirement: Action in accordance with Cessna SL No. SE71-11.\n\n \n\nCompliance: Within 50 hours time in service after 9 June 1971 and thereafter at intervals not exceeding 50 hours time in service.\n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The provided text sets a clear, limited scope: it applies to all TU206 and TP206 aircraft and requires actions per Cessna SL No. SE71-11 on a 50-hour recurring basis. The directive text itself does not indicate any expansion or narrowing of that scope from an earlier or different intent; no change of scope is evident in the material supplied (Applicability; Requirement; Compliance)."},"complexity_factors":["Narrow applicability: limited to TU206 and TP206 models (Applicability).","Direct reference to an external technical document (Cessna SL No. SE71-11), which shifts technical detail outside the directive (Requirement).","High-frequency, recurring compliance interval (every 50 hours time in service) increases operational and administrative burden (Compliance).","Legal text is short and prescriptive; absence of embedded technical steps reduces internal complexity but creates dependence on the external service letter (Requirement).","Clear compliance deadline tied to time-in-service requires reliable record-keeping and monitoring."],"plain_english_summary":"This airworthiness directive requires owners/operators of all Cessna TU206 and TP206 aeroplanes to perform and repeat the tasks specified in Cessna Service Letter SE71-11 on the exhaust manifold heat exchanger.  \n\nIt mandates the first action within 50 hours TIS after 9 June 1971 and repeat every 50 hours, shifting technical detail to the manufacturer, increasing recurring maintenance, downtime and costs, and creating dependence on the service letter for compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1971 addressing a specific mechanical component on specific aircraft models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document (under 150 words)","Only 2 defined applicability terms (TU206, TP206)","Single requirement referencing external document (Cessna SL No. SE71-11)","Simple compliance formula: 50 hours after date, then every 50 hours","No cross-references to other legislation, no conditional logic, no exceptions"],"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 Cessna aircraft.\n\n**What it does:**\n- Requires owners and operators of **Cessna TU206 and TP206 model aeroplanes** to inspect or maintain the **exhaust manifold heat exchanger** (a component that uses waste engine heat to warm the cabin and prevent carburetor icing).\n- The work must follow **Cessna Service Letter No. SE71-11** — a manufacturer's technical bulletin.\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains Cessna TU206 or TP206 aircraft in Australia.\n\n**Why it matters:**\n- Heat exchanger failures can lead to **carbon monoxide leaks into the cabin** (a deadly, odourless gas) or **loss of cabin heat** in cold conditions. This AD prevents accidents by forcing regular checks of this critical component.\n\n**When to comply:**\n- First inspection within **50 flight hours** after 9 June 1971, then **every 50 flight hours** thereafter."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-206-10-exhaust-manifold-heat-exchanger","history":"/api/acts/ad-cessna-206-10-exhaust-manifold-heat-exchanger/history","analysis":"/api/acts/ad-cessna-206-10-exhaust-manifold-heat-exchanger/analysis","conflicts":"/api/acts/ad-cessna-206-10-exhaust-manifold-heat-exchanger/conflicts","importantCases":"/api/acts/ad-cessna-206-10-exhaust-manifold-heat-exchanger/important-cases","documents":"/api/acts/ad-cessna-206-10-exhaust-manifold-heat-exchanger/documents"}}