{"id":"F2006B02086","name":"AD/AC/27 - Main Landing Gear Actuating Cylinder Body - Inspection","slug":"ad-ac-27-main-landing-gear-actuating-cylinder-body-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41316,"registerId":"commonwealth-F2006B02086-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/27 - Main Landing Gear Actuating Cylinder Body - Inspection","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 10/1962,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Main Landing Gear Actuating Cylinder Body - Inspection,27\ntitle: Airworthiness Directive - AD/AC/27 - Main Landing Gear Actuating Cylinder Body - Inspection\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)  Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes\n\n \n\nAD/AC/27 Main Landing Gear Actuating Cylinder Body - Inspection\n\nApplicability: All models: S/Nos. 871, 875 and 1150. Document:  Aero Commander SL No. 130.\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\n10/62\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1957},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope targeting only the specific landing gear cylinder defect in the three identified aircraft serial numbers."},"complexity_factors":["Single compliance requirement stated in one word ('Forthwith')","No defined terms or interpretation section","No cross-references to other legislation beyond the enabling Part 39","Applicability limited to three specific serial numbers only","No conditional logic, exceptions, or procedural steps"],"plain_english_summary":"This directive orders an immediate safety inspection of the main landing gear on specific Twin Commander aircraft.\n\n**Who is affected**: Owners and operators of Twin Commander (Gulfstream/Rockwell/Aerocommander 500, 600, and 700 series) aeroplanes with serial numbers **871, 875, or 1150**.\n\n**What you must do**: Inspect the **main landing gear actuating cylinder body** (the hydraulic component that extends and retracts the landing gear) following the procedures in Aero Commander Service Letter No. 130. This must be done **immediately** ('forthwith' means without delay).\n\n**Why it matters**: This targets a specific mechanical defect in just three aircraft. The landing gear is critical for safe landings, and this directive ensures the hydraulic cylinder won't fail."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-27-main-landing-gear-actuating-cylinder-body-inspection","history":"/api/acts/ad-ac-27-main-landing-gear-actuating-cylinder-body-inspection/history","analysis":"/api/acts/ad-ac-27-main-landing-gear-actuating-cylinder-body-inspection/analysis","conflicts":"/api/acts/ad-ac-27-main-landing-gear-actuating-cylinder-body-inspection/conflicts","importantCases":"/api/acts/ad-ac-27-main-landing-gear-actuating-cylinder-body-inspection/important-cases","documents":"/api/acts/ad-ac-27-main-landing-gear-actuating-cylinder-body-inspection/documents"}}