{"id":"F2006B05551","name":"AD/PA-25/13 - Fuel Line - Modification","slug":"ad-pa-25-13-fuel-line-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46511,"registerId":"commonwealth-F2006B05551-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-25/13 - Fuel Line - Modification","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)  Piper PA-25 (Pawnee) Series Aeroplanes\n\n \n\nAD/PA-25/13 Fuel Line - Modification 8/63\n\nApplicability: Models PA-25 and PA-25-235 and variants of those models.\n\n \n\nRequirement: Replace the existing flexible fuel line from the fuel filter to the carburettor by an approved fire resistant coupled hose assembly.\n\n \n\nCompliance: Before 1 September 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\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2211},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope concerning a single safety modification (fuel line replacement) for specific Piper aircraft models, with no expansion into broader airworthiness or operational requirements."},"complexity_factors":["Single operative requirement with no subsections, conditions, or exceptions","No definitions section or interpretation clauses","Specific technical terminology (carburettor, fuel filter, fire-resistant coupled hose) requires aviation domain knowledge","No cross-references to other legislative instruments or enabling regulations","Applicability limited to two specific aircraft models with no discretionary provisions"],"plain_english_summary":"**What this is:** A safety rule (Airworthiness Directive) for **Piper PA-25 Pawnee** agricultural aircraft.\n\n**Who it affects:** Owners and operators of PA-25 and PA-25-235 model aeroplanes and their variants.\n\n**What it requires:** You must replace the flexible fuel hose connecting the fuel filter to the carburettor (the device mixing fuel and air for the engine) with an **approved fire-resistant hose assembly**.\n\n**Why it matters:** Ordinary rubber fuel lines can melt or burst if exposed to engine heat or fire, causing catastrophic in-flight fires. This modification ensures the fuel line can withstand high temperatures long enough for the pilot to detect the problem and land safely."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-13-fuel-line-modification","history":"/api/acts/ad-pa-25-13-fuel-line-modification/history","analysis":"/api/acts/ad-pa-25-13-fuel-line-modification/analysis","conflicts":"/api/acts/ad-pa-25-13-fuel-line-modification/conflicts","importantCases":"/api/acts/ad-pa-25-13-fuel-line-modification/important-cases","documents":"/api/acts/ad-pa-25-13-fuel-line-modification/documents"}}