{"id":"F2008L01648","name":"AD/PA-20/9 Amdt 1 - Exhaust System - Inspection","slug":"ad-pa-20-9-amdt-1-exhaust-system-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":73735,"registerId":"commonwealth-F2008L01648-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-20 (Pacer) Series Aeroplanes","sectionType":"division","heading":"Piper PA-20 (Pacer) Series Aeroplanes","content":"### Piper PA-20 (Pacer) Series Aeroplanes\n\n| AD/PA-20/9 Amdt 1 | Exhaust System - Inspection | 6/2008 |\n| ----------------- | --------------------------- | ------ |\n\n| Applicability: | All models.                                                                         |\n| -------------- | ----------------------------------------------------------------------------------- |\n| Requirement:   | In accordance with Piper Service Letter No. 324B.Note: FAA AD 68-05-01 also refers. |\n| Compliance:    | Inspection at time intervals not exceeding 100 hours time in service.               |\n|                | This Amendment becomes effective on 5 June 2008.                                    |\n| Background:    | Correcting identification of Piper service instruction and adding FAA AD.           |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n31 March 2008","sortOrder":0},{"sectionNumber":"AD/PA-20/9 Amdt 1","sectionType":"part","heading":"AD/PA-20/9 Amdt 1","content":"## AD/PA-20/9 Amdt 1","sortOrder":1},{"sectionNumber":"Exhaust System - Inspection","sectionType":"part","heading":"Exhaust System - Inspection","content":"## Exhaust System - Inspection","sortOrder":2},{"sectionNumber":"6/2008","sectionType":"part","heading":"6/2008","content":"## 6/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment corrects the identification of the Piper service instruction (now specifying Service Letter No. 324B) and adds a reference to FAA AD 68-05-01 (Background). The core operational requirement — exhaust-system inspection at intervals not exceeding 100 hours time in service — and the applicability to all PA-20 models remain stated unchanged (Requirement / Compliance). The change is therefore administrative and clarificatory in scope (correcting references), rather than expanding the set of actions or the population of affected aircraft."},"complexity_factors":["Single, discrete technical requirement (exhaust-system inspection) reduces procedural complexity.","Mandatory reference to an external manufacturer document (Piper Service Letter No. 324B) adds dependence on locating and interpreting that document.","Cross-reference to an FAA Airworthiness Directive (FAA AD 68-05-01) increases the number of external materials operators must check.","Broad applicability (all PA-20 models) concentrates compliance obligations across all owners of that type.","Administrative amendment primarily corrects document identification rather than introducing new technical rules, limiting substantive complexity."],"plain_english_summary":"This instrument requires owners/operators of all Piper PA-20 (Pacer) aeroplanes to carry out recurring exhaust‑system inspections in accordance with Piper Service Letter No. 324B, at intervals not exceeding 100 hours time in service. Effective 5 June 2008, it corrects the service‑instruction reference and adds FAA AD 68‑05‑01; compliance (and related costs) rests with aircraft owners/operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a minor administrative amendment to an existing airworthiness directive. The scope remains unchanged—still focused solely on exhaust system inspections for the PA-20 series. The amendment merely corrects document references and adds a related FAA reference."},"complexity_factors":["Very short document (under 200 words)","Only 1 substantive requirement (inspect exhaust system)","Single cross-reference to manufacturer service letter","Single cross-reference to FAA AD","No defined terms section","No conditional logic or exceptions","Simple compliance structure (fixed time interval)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by the Civil Aviation Safety Authority (CASA) for owners and operators of **Piper PA-20 (Pacer) series aeroplanes**.\n\n**What it does:**\n- Requires regular **inspections of the exhaust system** on these aircraft\n- Mandates that these inspections follow **Piper Service Letter No. 324B** (a manufacturer's technical instruction)\n- Sets a maximum interval of **100 hours of flight time** between inspections\n\n**Who it affects:**\n- Anyone who owns or operates a Piper PA-20 (Pacer) aircraft\n- Maintenance engineers working on these planes\n\n**Why it matters:**\nExhaust system failures can cause carbon monoxide leaks (a deadly, odourless gas) or engine fires. This rule ensures potential cracks or corrosion are caught before they become dangerous.\n\n**What's changed in this version:**\nThis is an **amendment** (update) that:\n- Corrects which Piper service document to use\n- Adds a reference to a related US Federal Aviation Administration directive (FAA AD 68-05-01)\n\nThe directive became effective on **5 June 2008**."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-20-9-amdt-1-exhaust-system-inspection","history":"/api/acts/ad-pa-20-9-amdt-1-exhaust-system-inspection/history","analysis":"/api/acts/ad-pa-20-9-amdt-1-exhaust-system-inspection/analysis","conflicts":"/api/acts/ad-pa-20-9-amdt-1-exhaust-system-inspection/conflicts","importantCases":"/api/acts/ad-pa-20-9-amdt-1-exhaust-system-inspection/important-cases","documents":"/api/acts/ad-pa-20-9-amdt-1-exhaust-system-inspection/documents"}}