{"id":"F2006B08557","name":"AD/CHA/4 - Fuel Lines in Engine Compartment","slug":"ad-cha-4-fuel-lines-in-engine-compartment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51363,"registerId":"commonwealth-F2006B08557-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CHA/4 - Fuel Lines in Engine Compartment","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)  American Champion (Aeronca, Bellanca) Series Aeroplanes\n\n \n\nAD/CHA/4 Fuel Lines in Engine Compartment 10/71\n\nApplicability: All models not fitted with fire resistant fuel lines in the engine compartment.\n\n \n\nRequirement: Replace all engine compartment aluminium fuel lines with fire resistant flexible hose assemblies of fireproof rigid lines and fittings.\n\n \n\nNote: This requirement need not be applied to vent and drain lines as failure of these lines does not result in, or add to, a fire hazard.\n\n \n\nCompliance: Before 29 October 1971.\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":1210},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope: a specific safety mandate requiring replacement of aluminium fuel lines in the engine compartments of specific aircraft models to mitigate fire risks. No evidence of scope creep or expansion beyond this original technical safety purpose."},"complexity_factors":["Single, unambiguous requirement with no conditional logic","Only one explicit exception (vent and drain lines)","No defined terms section or cross-references to other legislation","Extremely short length (under 150 words)"],"plain_english_summary":"**What this does:** This is an aviation safety order (called an Airworthiness Directive) that applies to specific light aircraft—American Champion, Aeronca, and Bellanca models.\n\n**Who it affects:** Owners and operators of these aircraft that still have aluminium fuel lines running through the engine compartment.\n\n**What you must do:** Replace any aluminium fuel lines in the engine compartment with fire-resistant hoses or fireproof metal lines and fittings. This reduces the risk of fuel leaking onto hot engine parts and causing a fire.\n\n**Important exception:** You do **not** need to replace vent lines or drain lines, because if those fail, they don't create or worsen a fire hazard."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cha-4-fuel-lines-in-engine-compartment","history":"/api/acts/ad-cha-4-fuel-lines-in-engine-compartment/history","analysis":"/api/acts/ad-cha-4-fuel-lines-in-engine-compartment/analysis","conflicts":"/api/acts/ad-cha-4-fuel-lines-in-engine-compartment/conflicts","importantCases":"/api/acts/ad-cha-4-fuel-lines-in-engine-compartment/important-cases","documents":"/api/acts/ad-cha-4-fuel-lines-in-engine-compartment/documents"}}