{"id":"F2006B05552","name":"AD/PA-25/14 - Fire Protection - Modification - Relocation of Primer Line","slug":"ad-pa-25-14-fire-protection-modification-relocation-of-primer-line","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46514,"registerId":"commonwealth-F2006B05552-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-25/14 - Fire Protection - Modification - Relocation of Primer Line","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\n# AD/PA-25/14 Fire Protection - Modification - Relocation\n\nof Primer Line\n\nApplicability: Model PA-25-235 and variants of that model.\n\n# 8/63\n\n \n\nRequirement: All Piper PA-25-235 aircraft fitted with the standard cockpit heating installation are to be modified by re-routing the fuel primer line from fuel filter to primer pump, P/N 64179-04, to divert this line from the area immediately behind the engine exhaust heat exchange (muffler). Figure 1 illustrates an acceptable means of compliance.\n\nAlternatively, or in addition, replace the existing copper line by a steel line.\n\n \n\nCompliance: Before 1 September 1971.\n\n \n\n![](image.002.png)  \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":1816},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope focused solely on fire protection modifications for the fuel primer line routing in Piper PA-25-235 aircraft."},"complexity_factors":["Single, clearly defined aircraft model applicability","Straightforward mechanical modification with only two alternative methods permitted","Fixed compliance date with no conditional extensions or exceptions","Minimal cross-referencing (only one specific part number cited)"],"plain_english_summary":"**What this does:** Requires a safety modification to specific Piper Pawnee aircraft to reduce the risk of engine fires.\n\n**Who it affects:** Owners and operators of Piper PA-25-235 aircraft (and variants) that have the standard cockpit heating system installed.\n\n**What must be done:**\n- **Re-route** the fuel primer line so it no longer runs immediately behind the engine exhaust heat exchanger (muffler), OR\n- **Replace** the existing copper primer line with a steel line\n\n**Why it matters:** The original design placed fuel lines dangerously close to hot exhaust components. If the fuel line leaked, it could ignite. Moving the line or using steel (which is more heat-resistant than copper) prevents this fire hazard.\n\n**Deadline:** Aircraft had to be modified before 1 September 1971."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-14-fire-protection-modification-relocation-of-primer-line","history":"/api/acts/ad-pa-25-14-fire-protection-modification-relocation-of-primer-line/history","analysis":"/api/acts/ad-pa-25-14-fire-protection-modification-relocation-of-primer-line/analysis","conflicts":"/api/acts/ad-pa-25-14-fire-protection-modification-relocation-of-primer-line/conflicts","importantCases":"/api/acts/ad-pa-25-14-fire-protection-modification-relocation-of-primer-line/important-cases","documents":"/api/acts/ad-pa-25-14-fire-protection-modification-relocation-of-primer-line/documents"}}