{"id":"F2006B11078","name":"AD/LA-4/4 - Fuel Filter - Installation","slug":"ad-la-4-4-fuel-filter-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56730,"registerId":"commonwealth-F2006B11078-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LA-4/4 - Fuel Filter - Installation","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)  Consolidated Aeronautics, Colonial and LA-4 Series Aeroplanes\n\n \n\nAD/LA-4/4 Fuel Filter - Installation 4/72\n\nApplicability: All Lake LA-4 models with S/Nos. 246 and subsequent. Document:  Consolidated Aeronautics SL No. 36.\n\nCompliance: Within 100 hours time in service after 31 May 1972.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1568},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive retains its original narrow technical scope from 1972, targeting only the fuel filter installation requirement for specific Lake LA-4 aircraft without expansion into broader operational or maintenance rules."},"complexity_factors":["Single compliance action with no exceptions or alternatives","Clear applicability limited to specific aircraft model and serial number range","Only one external technical reference (Service Letter No. 36)","No defined terms, conditional logic, or cross-references to other legislation"],"plain_english_summary":"**What this is:** An Airworthiness Directive — a mandatory safety order issued by the Civil Aviation Safety Authority requiring a specific mechanical fix on certain aircraft.\n\n**Who it affects:** Owners and operators of **Lake LA-4 model aeroplanes** with **serial numbers 246 and higher**.\n\n**What you must do:** Install a fuel filter on the aircraft exactly as instructed in the manufacturer's document called **Consolidated Aeronautics Service Letter No. 36**.\n\n**When:** The installation must be completed within **100 hours of flight time** (counted from when the aircraft is actually flying, not just idling on the ground) after **31 May 1972**.\n\n**Why it matters:** This prevents contaminants from reaching the engine, reducing the risk of engine failure and ensuring the aircraft remains legally airworthy and safe to fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-la-4-4-fuel-filter-installation","history":"/api/acts/ad-la-4-4-fuel-filter-installation/history","analysis":"/api/acts/ad-la-4-4-fuel-filter-installation/analysis","conflicts":"/api/acts/ad-la-4-4-fuel-filter-installation/conflicts","importantCases":"/api/acts/ad-la-4-4-fuel-filter-installation/important-cases","documents":"/api/acts/ad-la-4-4-fuel-filter-installation/documents"}}