{"id":"F2006B05550","name":"AD/PA-25/12 Amdt 2 - Exhaust System - Inspection","slug":"ad-pa-25-12-amdt-2-exhaust-system-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46508,"registerId":"commonwealth-F2006B05550-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-25/12 Amdt 2 - Exhaust System -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-25 (Pawnee) Series Aeroplanes\n\n \n\n# AD/PA-25/12\n\nAmdt 2\n\nApplicability: All models.\n\n# Exhaust System - Inspection 2/74\n\n \n\nDocument: Piper SL No. 324C.\n\n \n\nCompliance: At intervals not exceeding 100 hours time in service after 28 February 1974.\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":1623},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"As Amendment 2, the directive retains its original narrow focus on exhaust system inspections for the Piper PA-25 series. There is no indication of scope creep beyond the specific airworthiness issue addressed in the original 1974 directive."},"complexity_factors":["Single compliance obligation with no exceptions or conditions","No definitions section or interpretive provisions","No cross-references to other legislation (only a reference to manufacturer technical document)","Straightforward applicability statement covering all models of a single aircraft type"],"plain_english_summary":"This is an Airworthiness Directive (AD) — a mandatory safety rule issued by the Civil Aviation Safety Authority (CASA) under aviation law.\n\n**What it does:**\nRequires owners and operators of **Piper PA-25 Pawnee aircraft** (all models) to inspect the exhaust system regularly to ensure it is safe.\n\n**Key requirements:**\n- **Who is affected:** Anyone operating a Piper PA-25 series aeroplane.\n- **What must be done:** Inspect the exhaust system following the procedures in Piper Service Letter No. 324C (the manufacturer's technical instructions).\n- **When:** Every 100 hours of \"time in service\" (flight time) starting from 28 February 1974.\n\n**Why it matters:**\nAirworthiness Directives are legally binding. An aircraft cannot fly legally unless it complies with all applicable ADs. This rule ensures exhaust system failures — which could cause carbon monoxide leaks or fires — are caught before they become dangerous."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-12-amdt-2-exhaust-system-inspection","history":"/api/acts/ad-pa-25-12-amdt-2-exhaust-system-inspection/history","analysis":"/api/acts/ad-pa-25-12-amdt-2-exhaust-system-inspection/analysis","conflicts":"/api/acts/ad-pa-25-12-amdt-2-exhaust-system-inspection/conflicts","importantCases":"/api/acts/ad-pa-25-12-amdt-2-exhaust-system-inspection/important-cases","documents":"/api/acts/ad-pa-25-12-amdt-2-exhaust-system-inspection/documents"}}