{"id":"F2006B05413","name":"AD/PA-20/9 - Exhaust System - Inspection","slug":"ad-pa-20-9-exhaust-system-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46070,"registerId":"commonwealth-F2006B05413-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-20/9 - Exhaust System - 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)  Piper PA-20 (Pacer) Series Aeroplanes\n\n \n\nAD/PA-20/9 Exhaust System - Inspection NK\n\nApplicability:  All models. Document: Piper SB No 324B.\n\nCompliance: Inspection at intervals not exceeding 100 hours time in service\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":888},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive remains tightly scoped to its original purpose: exhaust system inspection requirements for a specific aircraft type. No regulatory creep or expansion beyond aviation safety maintenance obligations."},"complexity_factors":["Single, unambiguous compliance requirement (inspect every 100 hours)","No interpretation section or defined terms","No exceptions, exemptions, or conditional logic","Only one external reference (Piper SB 324B)","Extremely short document (approximately 50 words of substantive content)"],"plain_english_summary":"**What this does:** This Airworthiness Directive (AD) mandates safety inspections of the exhaust system on Piper PA-20 Pacer aircraft.\n\n**Who it affects:** Owners and operators of all Piper PA-20 model aircraft.\n\n**What you must do:** Inspect the exhaust system at least once every 100 hours of \"time in service\" (flight time). The inspections must follow the procedures outlined in **Piper Service Bulletin No. 324B**.\n\n**Why it matters:** Exhaust system failures can cause carbon monoxide poisoning (a deadly, odourless gas) or engine fires. This directive ensures potential cracks or corrosion are caught before they become dangerous.\n\n**Key point:** This is a recurring requirement — not a one-off. Every 100 flight hours, the exhaust must be checked again to maintain legal airworthiness."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-20-9-exhaust-system-inspection","history":"/api/acts/ad-pa-20-9-exhaust-system-inspection/history","analysis":"/api/acts/ad-pa-20-9-exhaust-system-inspection/analysis","conflicts":"/api/acts/ad-pa-20-9-exhaust-system-inspection/conflicts","importantCases":"/api/acts/ad-pa-20-9-exhaust-system-inspection/important-cases","documents":"/api/acts/ad-pa-20-9-exhaust-system-inspection/documents"}}