{"id":"F2006B09058","name":"AD/DHC-3/10 - Exhaust System","slug":"ad-dhc-3-10-exhaust-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52801,"registerId":"commonwealth-F2006B09058-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-3/10 - Exhaust System","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)  DHC-3 (Otter) Series Aeroplanes\n\n \n\nAD/DHC-3/10 Exhaust System NK\n\nApplicability: As detailed in Requirement Document.\n\n \n\nRequirement: Action in accordance with De H Canada EB “O” No 19.\n\n \n\nNote: Canadian AD 56-12 refers.\n\n \n\nCompliance: Forthwith.\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 standard, narrow airworthiness directive focused on a specific aircraft type and specific system. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document (under 200 words)","Only 1 substantive requirement, which delegates entirely to an external document (De Havilland Canada EB \"O\" No. 19)","No defined terms within the instrument itself","No conditional logic or nested exceptions","Single cross-reference to Canadian AD 56-12 (informational only)","Simple structure: Applicability → Requirement → Note → Compliance"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to **DHC-3 Otter series aircraft** (a type of Canadian-built bush plane).\n\n**What it does:**\n- Requires owners/operators to inspect or repair the **exhaust system** on these planes\n- The specific work required is detailed in a separate document: **De Havilland Canada Engineering Bulletin \"O\" No. 19**\n- References a related Canadian safety order: **Canadian AD 56-12**\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains DHC-3 Otter aircraft in Australia\n- Maintenance engineers working on these planes\n\n**Why it matters:**\nExhaust system failures can cause carbon monoxide poisoning (a deadly, odourless gas), fire, or engine damage. This directive forces immediate action to prevent accidents.\n\n**When to comply:**\n**\"Forthwith\"** means immediately — before the next flight."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The text supplied does not indicate any change in scope from an earlier or original intent. It sets out a requirement that applies to DHC-3 (Otter) series aeroplanes as defined in a separate Requirement Document and directs compliance with De H Canada EB 'O' No. 19, with reference to Canadian AD 56-12 and an immediate compliance obligation (\"Applicability: As detailed in Requirement Document.\"; \"Requirement: Action in accordance with De H Canada EB 'O' No 19.\"; \"Note: Canadian AD 56-12 refers.\"; \"Compliance: Forthwith.\"). There is no statement in the supplied text that alters or narrows that applicability or the required actions."},"complexity_factors":["References external documents for both applicability and required actions (\"Applicability: As detailed in Requirement Document.\"; \"Requirement: Action in accordance with De H Canada EB 'O' No 19.\")","Cross-reference to a foreign airworthiness directive (Canadian AD 56-12), requiring coordination or review of non-domestic material (\"Note: Canadian AD 56-12 refers.\")","Immediate compliance timeframe (\"Compliance: Forthwith\") which compresses scheduling for inspections/repairs","Lack of substantive detail in the directive text about the specific inspections, modifications, acceptance criteria or reporting requirements","Potential ambiguity about which individual aircraft are covered because applicability is delegated to a separate Requirement Document","No enforcement or verification procedures stated in the text supplied, creating possible implementation variation"],"plain_english_summary":"This airworthiness directive applies to De Havilland DHC‑3 (Otter) series aeroplanes and mandates immediate compliance with De Havilland Canada Emergency Bulletin “O” No. 19, cross‑referencing Canadian AD 56‑12. It affects aircraft owners, operators, maintenance organisations and certificated engineers responsible for affected Otters. The directive creates an urgent inspection/repair obligation and related cost, scheduling and administrative burdens, while deferring technical detail to the manufacturer bulletin and the Requirement Document."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-3-10-exhaust-system","history":"/api/acts/ad-dhc-3-10-exhaust-system/history","analysis":"/api/acts/ad-dhc-3-10-exhaust-system/analysis","conflicts":"/api/acts/ad-dhc-3-10-exhaust-system/conflicts","importantCases":"/api/acts/ad-dhc-3-10-exhaust-system/important-cases","documents":"/api/acts/ad-dhc-3-10-exhaust-system/documents"}}