{"id":"F2006B05563","name":"AD/PA-25/25 - Fuel Cell Vent - Modification","slug":"ad-pa-25-25-fuel-cell-vent-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46549,"registerId":"commonwealth-F2006B05563-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-25/25 - Fuel Cell Vent - 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-25/25 Fuel Cell Vent - Modification 1/68\n\nApplicability: All models fitted with rubber lined fuel cells Piper P/N 64747-00. Document:  Piper SB No. 247.\n\nCompliance: Within 100 hours time in service after 25 January 1968.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1042},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a targeted, technical safety directive addressing a specific mechanical defect in defined aircraft. It has not expanded beyond its original purpose of mandating a fuel vent modification."},"complexity_factors":["Single, unambiguous applicability clause targeting one aircraft model series","No interpretation section or defined terms","Single compliance action with straightforward deadline","No exceptions, provisos, or nested conditional logic","Stand-alone instrument with no cross-references to other legislative provisions"],"plain_english_summary":"**What it is:** A mandatory safety instruction (called an Airworthiness Directive) for owners and operators of specific Piper agricultural aircraft.\n\n**What it requires:** If you operate a Piper PA-25 \"Pawnee\" aircraft fitted with specific rubber-lined fuel cells (part number 64747-00), you must modify the fuel cell vent system according to Piper Service Bulletin No. 247.\n\n**When it had to be done:** Within 100 hours of flying time after 25 January 1968.\n\n**Why it matters:** This prevents potential fuel system failures—critical for safety since the PA-25 is often used for crop-dusting and aerial application work where fuel leaks or ventilation problems could cause crashes or fires."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-25-fuel-cell-vent-modification","history":"/api/acts/ad-pa-25-25-fuel-cell-vent-modification/history","analysis":"/api/acts/ad-pa-25-25-fuel-cell-vent-modification/analysis","conflicts":"/api/acts/ad-pa-25-25-fuel-cell-vent-modification/conflicts","importantCases":"/api/acts/ad-pa-25-25-fuel-cell-vent-modification/important-cases","documents":"/api/acts/ad-pa-25-25-fuel-cell-vent-modification/documents"}}