{"id":"F2006B05396","name":"AD/PA-18/6 - Exhaust System - Inspection","slug":"ad-pa-18-6-exhaust-system-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46025,"registerId":"commonwealth-F2006B05396-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-18/6 - 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-18 and 19 (Super Cub) Series Aeroplanes\n\n \n\nAD/PA-18/6 Exhaust System - Inspection 3/63\n\nApplicability:  All models. Document: Piper SL No. 324B.\n\nCompliance: 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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused solely on exhaust system inspection for a specific aircraft type. It has not expanded beyond its original purpose; Airworthiness Directives are inherently narrow, reactive instruments addressing specific airworthiness concerns."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","Zero defined terms within the instrument itself (relies on external definitions in CAR 1998)","Single, unambiguous compliance requirement (100-hour interval)","No cross-references to other legislation beyond the parent regulation citation","No conditional logic, exceptions, or alternative compliance methods","References only one external technical document (Piper SL No. 324B)"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires owners and operators of **Piper PA-18 and PA-19 \"Super Cub\" aeroplanes** to inspect the exhaust system at regular intervals.\n\n**Who must comply:** Anyone operating these specific Piper aircraft models (all variants are covered).\n\n**What must be done:** The exhaust system must be inspected **every 100 hours of \"time in service\"** (meaning actual flight hours, not calendar time). The inspection must follow the procedures in **Piper Service Letter No. 324B** (a technical document from the manufacturer).\n\n**Why it matters:** Exhaust system failures can cause carbon monoxide leaks into the cabin or engine damage — both potentially fatal. This AD ensures potential cracks, corrosion, or wear are caught before they become dangerous.\n\n**Key point:** This is not optional. Non-compliance means the aircraft cannot legally fly."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive text itself states a clear applicability (all models) and a fixed compliance interval (not exceeding 100 hours). The document contains no indication that the scope has been expanded or narrowed from an earlier version; it sets the requirement as applying to all models of the Piper PA-18 and PA-19 series and points to Piper SL No. 324B for technical detail."},"complexity_factors":["Short, single substantive requirement (inspection every 100 hours) reduces internal complexity.","Applies broadly to all models of the specified series (Applicability), which simplifies scope but broadens affected population.","Relies on an external technical document (Piper SL No. 324B) for procedure and corrective action, adding dependency complexity.","Legal/regulatory embedding under Civil Aviation Regulations/PART 39 requires compliance and enforcement mechanisms.","Requires operational tracking of hours-in-service and maintenance records, adding administrative burden."],"plain_english_summary":"This directive requires operators of Piper PA‑18 and PA‑19 (Super Cub) aeroplanes to inspect the exhaust system at intervals not exceeding 100 hours TIS, with inspection procedures and corrective actions to follow Piper Service Letter No. 324B. It affects aircraft owners/operators and maintenance organisations, is enforceable under the Commonwealth/CASA airworthiness regime, and imposes recurring inspection, repair and record‑keeping costs on owners."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-18-6-exhaust-system-inspection","history":"/api/acts/ad-pa-18-6-exhaust-system-inspection/history","analysis":"/api/acts/ad-pa-18-6-exhaust-system-inspection/analysis","conflicts":"/api/acts/ad-pa-18-6-exhaust-system-inspection/conflicts","importantCases":"/api/acts/ad-pa-18-6-exhaust-system-inspection/important-cases","documents":"/api/acts/ad-pa-18-6-exhaust-system-inspection/documents"}}