{"id":"F2006B05424","name":"AD/PA-22/20 - Exhaust System - Inspection","slug":"ad-pa-22-20-exhaust-system-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46108,"registerId":"commonwealth-F2006B05424-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-22/20 - 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-22 (Tri-Pacer and Colt) Series Aeroplanes\n\n \n\nAD/PA-22/20 Exhaust System - Inspection 9/62\n\nApplicability:  All models. Document: Piper SL No. 324B.\n\nCompliance: Inspection at intervals not exceeding 100 hours time in service after 21 January 1963.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text establishes a focused, recurring inspection obligation for the exhaust system of all Piper PA‑22 models and references Piper Service Letter No. 324B for further detail. The directive does not indicate any change to that scope within the supplied text; it sets a clear applicability and a fixed inspection interval (Applicability; Compliance; Document reference)."},"complexity_factors":["Narrow scope — applies only to Piper PA‑22 series (Applicability: All models).","Single, recurring action mandated — an inspection at intervals not exceeding 100 hours TIS (Compliance line).","Reference to external technical document (Piper SL No. 324B) — implementers must consult that document for procedures (Document reference).","Historical start date (after 21 January 1963) — may require retrospective tracking for hours‑in‑service records (Compliance line).","Minimal procedural detail in the directive itself — increases reliance on the referenced service letter for inspection content and criteria (Document reference)."],"plain_english_summary":"This Civil Aviation Safety Authority Airworthiness Directive requires owners/operators of all Piper PA‑22 (Tri‑Pacer and Colt) aircraft to inspect the exhaust system at intervals not exceeding 100 hours time‑in‑service (from 21 Jan 1963), referencing Piper Service Letter No. 324B for inspection detail. It imposes a recurring maintenance and record‑keeping obligation and associated compliance costs for affected aircraft."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive from 1962 (indicated by '9/62' — September 1962). It has not expanded beyond its original narrow purpose of exhaust system inspection for one specific aircraft series. Airworthiness Directives are inherently narrow instruments addressing specific safety defects."},"complexity_factors":["Extremely short document (under 150 words of substantive content)","Only 4 operative elements: applicability, reference document, compliance deadline, and inspection interval","No defined terms section (relies on standard aviation terminology like 'time in service')","No cross-references to other legislation beyond the enabling regulation (CAR 1998 Part 39)","No conditional logic, exceptions, or nested provisions","Single straightforward obligation with clear quantitative trigger (100 hours)"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of **Piper PA-22 Tri-Pacer and Colt series aeroplanes** to inspect the aircraft's **exhaust system** at regular intervals.\n\n**Who it affects:** Anyone who owns, operates, or maintains a Piper PA-22 aircraft in Australia.\n\n**The specific requirements:**\n- **Inspection frequency:** Every 100 hours of \"time in service\" (meaning actual flight time, not calendar time)\n- **Deadline:** The first inspection must happen by 21 January 1963, with repeats every 100 hours after that\n- **Technical standard:** The inspection must follow **Piper Service Letter No. 324B** (the manufacturer's official maintenance guidance)\n\n**Why it matters:** Exhaust system failures can cause carbon monoxide leaks into the cabin (which can incapacitate or kill pilots and passengers) or engine damage. This AD ensures potential cracks, corrosion, or wear get caught before they become dangerous.\n\n**Key point:** This is **not optional**. Compliance is legally mandatory for airworthiness — you cannot legally fly the aircraft without doing this inspection."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-22-20-exhaust-system-inspection","history":"/api/acts/ad-pa-22-20-exhaust-system-inspection/history","analysis":"/api/acts/ad-pa-22-20-exhaust-system-inspection/analysis","conflicts":"/api/acts/ad-pa-22-20-exhaust-system-inspection/conflicts","importantCases":"/api/acts/ad-pa-22-20-exhaust-system-inspection/important-cases","documents":"/api/acts/ad-pa-22-20-exhaust-system-inspection/documents"}}