{"id":"F2006B05232","name":"AD/CESSNA 206/28 - Fuel Tank Filler Neck","slug":"ad-cessna-206-28-fuel-tank-filler-neck","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45516,"registerId":"commonwealth-F2006B05232-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 206/28 - Fuel Tank Filler Neck","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 206/28 Fuel Tank Filler Neck 9/79\n\nApplicability: Model U206 with S/Nos. U20604650 to 04840. Requirement:  Action in accordance with Cessna SIL No. SE79-33. Compliance:               Within 100 hours time in service after 30 September 1979.\n\nBackground: Certain 1979 model 206 aircraft fuel tanks may have been fitted with incorrect filler neck assemblies during manufacture. As the filler necks form fuel level indicators it is essential for flight planning purposes that a neck of correct length is fitted.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2057},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope targeting a specific manufacturing defect in a limited production run of Cessna aircraft. It has not expanded beyond the original safety issue regarding incorrect fuel tank filler neck assemblies."},"complexity_factors":["Single-page document with no defined terms or interpretation section","Applicability limited to specific aircraft serial number range (U20604650 to U20604840)","Single unambiguous compliance action referencing one external technical standard (Cessna SIL SE79-33)","No exceptions, exemptions, nested conditions, or discretionary provisions","Straightforward deadline calculation based on flight hours after a fixed date"],"plain_english_summary":"This airworthiness directive (a mandatory safety order) requires owners of specific Cessna 206 aircraft to fix a manufacturing defect in the fuel tank filler neck.\n\n**Who is affected**\nOwners of Cessna Model U206 aircraft with serial numbers U20604650 to U20604840 (specific 1979 production models).\n\n**What must be done**\nInspect and, if necessary, replace the fuel tank filler neck assembly following the manufacturer's instructions in Cessna Service Information Letter (SIL) No. SE79-33. This ensures the neck is the correct length.\n\n**Why this matters**\nThe filler neck acts as a fuel level indicator. Some aircraft were built with incorrectly sized necks, causing the fuel gauges to give false readings. Because pilots rely on these readings to calculate fuel reserves for flights, wrong measurements could lead to fuel exhaustion and engine failure mid-flight.\n\n**Compliance deadline**\nWithin 100 hours of 'time in service' (total flight hours) after 30 September 1979."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-206-28-fuel-tank-filler-neck","history":"/api/acts/ad-cessna-206-28-fuel-tank-filler-neck/history","analysis":"/api/acts/ad-cessna-206-28-fuel-tank-filler-neck/analysis","conflicts":"/api/acts/ad-cessna-206-28-fuel-tank-filler-neck/conflicts","importantCases":"/api/acts/ad-cessna-206-28-fuel-tank-filler-neck/important-cases","documents":"/api/acts/ad-cessna-206-28-fuel-tank-filler-neck/documents"}}