{"id":"F2006B09010","name":"AD/DHC-1/3 - Fuel Line Cock to Filter - Replacement","slug":"ad-dhc-1-3-fuel-line-cock-to-filter-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52670,"registerId":"commonwealth-F2006B09010-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-1/3 - Fuel Line Cock to Filter - Replacement","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)  De Havilland DHC-1 (Chipmunk) Series Aeroplanes\n\n \n\nAD/DHC-1/3 Fuel Line Cock to Filter - Replacement 6/55\n\nApplicability: All English production models. Document: 1. DH Chipmunk Mod. H.188; or\n\n2. ANO 105.1.14.15.5.3.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1876},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope: mandating the replacement of a specific fuel system component on English-manufactured Chipmunk aircraft."},"complexity_factors":["Single, unambiguous operative provision requiring one specific mechanical action","No interpretation section, defined terms, or conditional logic","Immediate compliance requirement with no phased implementation or exceptions","Narrow applicability limited to one specific aircraft model series (English-built Chipmunks)"],"plain_english_summary":"This **Airworthiness Directive (AD)** is a mandatory safety order made by the Civil Aviation Safety Authority (CASA) under Commonwealth aviation law.\n\n**What it requires**\nOwners and operators must immediately replace the fuel line valve (the 'cock') that sits between the fuel line and the filter on affected aircraft.\n\n**Who it affects**\nThis applies specifically to **English-built models** of the De Havilland DHC-1 Chipmunk aeroplane.\n\n**How to comply**\nYou must carry out the replacement in accordance with either:\n* De Havilland Chipmunk Modification H.188; or  \n* Air Navigation Order 105.1.14.15.5.3.\n\n**When to do it**\n**Immediately** — the directive uses the term 'forthwith', which means without delay or as soon as practicable.\n\n**Why it matters**\nAirworthiness Directives are legally binding. This one addresses a specific safety defect in the original fuel system component that could lead to fuel starvation, engine failure, or fire if not rectified."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-1-3-fuel-line-cock-to-filter-replacement","history":"/api/acts/ad-dhc-1-3-fuel-line-cock-to-filter-replacement/history","analysis":"/api/acts/ad-dhc-1-3-fuel-line-cock-to-filter-replacement/analysis","conflicts":"/api/acts/ad-dhc-1-3-fuel-line-cock-to-filter-replacement/conflicts","importantCases":"/api/acts/ad-dhc-1-3-fuel-line-cock-to-filter-replacement/important-cases","documents":"/api/acts/ad-dhc-1-3-fuel-line-cock-to-filter-replacement/documents"}}