{"id":"F2006B08322","name":"AD/CESSNA 400/36 - Wing Leading Edge Fuel Line - Inspection","slug":"ad-cessna-400-36-wing-leading-edge-fuel-line-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115729,"registerId":"commonwealth-F2006B08322-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/36 - Wing Leading Edge Fuel Line - Inspection","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 400 Series Aeroplanes\n\n \n\nAD/CESSNA 400/36 Wing Leading Edge Fuel Line - Inspection 8/73\n\nApplicability: All models 401 and 402 with S/Nos. below 401-0135 and 402-0135, fitted with turbocharger cooling duct P/N S1053E20T and fuel line P/N 5200106-55.\n\n \n\nRequirement:  1. For aircraft fitted with wing leading edge turbocharger cooling flexible ducts - Through access panel No. 43, inspect fuel line P/N 5200106-55 for chafing by flexible duct P/N S1053E20T.\n\n \n\n2. Rectify any chafing and ensure adequate clearance is maintained by realignment of flexible duct.\n\n \n\nCompliance: Before 1 October 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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1968},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original targeted scope addressing a specific mechanical interference issue between a fuel line and cooling duct on defined aircraft configurations. It has not expanded beyond this initial safety-critical engineering purpose."},"complexity_factors":["Extremely narrow applicability limited to specific aircraft models and serial number ranges","Precise technical part number identifiers (P/N S1053E20T, P/N 5200106-55)","Single, unambiguous inspection task with binary outcome","No cross-references to other legislative instruments or conditional logic","Straightforward rectification requirement without nested exceptions"],"plain_english_summary":"This Airworthiness Directive imposes a mandatory safety inspection on specific Cessna twin-engine aircraft to prevent fuel leaks. **Who is affected:** Owners and operators of Cessna 401 and 402 models with serial numbers below 401-0135 and 402-0135, specifically those fitted with turbocharger cooling duct part number S1053E20T and fuel line part number 5200106-55. **What is required:** Through access panel 43, visually inspect the fuel line for **chafing** (wear damage caused by rubbing) where it contacts the flexible cooling duct. If any wear is found, repair it and realign the duct to ensure adequate clearance between the components. **Why it matters:** Rubbing between the fuel line and cooling duct can wear through the fuel line wall, creating a serious risk of fuel leakage and potential fire. This directive ensures a specific mechanical interference defect is identified and rectified before it compromises flight safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-36-wing-leading-edge-fuel-line-inspection","history":"/api/acts/ad-cessna-400-36-wing-leading-edge-fuel-line-inspection/history","analysis":"/api/acts/ad-cessna-400-36-wing-leading-edge-fuel-line-inspection/analysis","conflicts":"/api/acts/ad-cessna-400-36-wing-leading-edge-fuel-line-inspection/conflicts","importantCases":"/api/acts/ad-cessna-400-36-wing-leading-edge-fuel-line-inspection/important-cases","documents":"/api/acts/ad-cessna-400-36-wing-leading-edge-fuel-line-inspection/documents"}}