{"id":"F2006B11068","name":"AD/LA-4/18 - Trim Actuating Cylinder Bracket - Inspection","slug":"ad-la-4-18-trim-actuating-cylinder-bracket-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56703,"registerId":"commonwealth-F2006B11068-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LA-4/18 - Trim Actuating Cylinder Bracket - 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)  Consolidated Aeronautics, Colonial and LA-4 Series Aeroplanes\n\n \n\nAD/LA-4/18 Trim Actuating Cylinder Bracket - Inspection 7/79\n\nApplicability: All models LA-4 and LA-4-200 with S/Nos. 144 to 650.\n\n \n\nDocument: Lake Aircraft Division, Consolidated Aeronautics Inc. SB No. B-55. Compliance: Within 100 hours time in service after 31 July 1979.\n\nBackground:  At manufacture the 4 rivets securing the trim actuating bracket lower flange to the fin rib may have been omitted.\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":1244},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope addressing a specific manufacturing defect in particular Lake LA-4 aircraft models. It has not expanded beyond the original safety issue of potentially omitted rivets on the trim actuating cylinder bracket."},"complexity_factors":["Single, specific mechanical inspection requirement (rivet check on one bracket)","Narrow applicability limited to specific aircraft model and serial number range (S/Nos. 144-650)","Simple compliance trigger (hours of flight time after fixed date)","No exceptions, exemptions, or conditional provisions"],"plain_english_summary":"**What this does:**\nThis is a mandatory safety inspection order for specific Lake amphibious aircraft (LA-4 and LA-4-200 models, serial numbers 144–650). It requires aircraft owners to check that four rivets (metal fasteners) were installed on the bracket that controls the trim system—a part of the flight controls that helps keep the plane flying level.\n\n**Why it matters:**\nDuring manufacturing, these rivets may have been accidentally left out. If missing, the trim actuating bracket could fail in flight, potentially causing loss of aircraft control.\n\n**What must be done:**\n*   **Inspection required:** Check the trim actuating cylinder bracket lower flange for missing rivets per Lake Aircraft Service Bulletin B-55\n*   **Deadline:** Within 100 hours of flying time after 31 July 1979\n*   **Who is affected:** Owners/operators of affected Lake LA-4 aircraft"}},"importantCases":[],"_links":{"self":"/api/acts/ad-la-4-18-trim-actuating-cylinder-bracket-inspection","history":"/api/acts/ad-la-4-18-trim-actuating-cylinder-bracket-inspection/history","analysis":"/api/acts/ad-la-4-18-trim-actuating-cylinder-bracket-inspection/analysis","conflicts":"/api/acts/ad-la-4-18-trim-actuating-cylinder-bracket-inspection/conflicts","importantCases":"/api/acts/ad-la-4-18-trim-actuating-cylinder-bracket-inspection/important-cases","documents":"/api/acts/ad-la-4-18-trim-actuating-cylinder-bracket-inspection/documents"}}