{"id":"F2006B02120","name":"AD/AC/61 Amdt 1 - Elevator Trim Sprocket Assembly - Inspection and Modification","slug":"ad-ac-61-amdt-1-elevator-trim-sprocket-assembly-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41350,"registerId":"commonwealth-F2006B02120-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/61 Amdt 1 - Elevator Trim Sprocket Assembly - Inspection and Modification","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 9/1978,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Elevator Trim Sprocket Assembly - Inspection and Modification,61 Amdt 1\ntitle: Airworthiness Directive - AD/AC/61 Amdt 1 - Elevator Trim Sprocket Assembly - Inspection and Modification\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/61\n\nAmdt 1\n\n\nElevator Trim Sprocket Assembly - Inspection and Modification\n\n\n9/78\n\n \n\nApplicability: As referenced in SL No. 317. Document:  Rockwell International SL No. 317.\n\nCompliance: Category 1 - Within 100 hours’ time in service after 30 September 1978.\n\n \n\n2. - Before 1 September 1979.\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":1748},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original technical scope of addressing elevator trim sprocket assembly safety in specific Twin Commander aircraft models. As Amendment 1 to an existing Airworthiness Directive, it appears to update compliance timeframes rather than expand the regulatory scope beyond the original safety purpose."},"complexity_factors":["Very short substantive content (approximately 80 words of operative text)","No defined terms or interpretation section","Single external reference document (Rockwell SL No. 317)","Simple binary compliance structure (two alternative deadlines)","No nested exceptions or conditional logic beyond the two compliance categories"],"plain_english_summary":"This is a **safety order** (called an Airworthiness Directive) issued by the Civil Aviation Safety Authority (CASA) for owners and operators of specific Twin Commander aircraft.\n\n**What it requires:**\n- **Inspection and modification** of the **elevator trim sprocket assembly** — a mechanical component that helps control the aircraft's pitch (nose up/down movement)\n- The work must be carried out according to **Rockwell International Service Letter No. 317**\n\n**Who it affects:**\n- Owners and operators of Twin Commander (Gulfstream/Rockwell/Aero Commander) 500, 600, and 700 series aeroplanes\n\n**When it must be done:**\n- **Category 1:** Within 100 hours of flight time after 30 September 1978, **or**\n- **Before 1 September 1979**\n\n**Why it matters:**\nThis directive prevents potential failure of a critical flight control component that could lead to loss of aircraft control. It is legally binding and must be completed before the aircraft can continue operating."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-61-amdt-1-elevator-trim-sprocket-assembly-inspection-and-modification","history":"/api/acts/ad-ac-61-amdt-1-elevator-trim-sprocket-assembly-inspection-and-modification/history","analysis":"/api/acts/ad-ac-61-amdt-1-elevator-trim-sprocket-assembly-inspection-and-modification/analysis","conflicts":"/api/acts/ad-ac-61-amdt-1-elevator-trim-sprocket-assembly-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-ac-61-amdt-1-elevator-trim-sprocket-assembly-inspection-and-modification/important-cases","documents":"/api/acts/ad-ac-61-amdt-1-elevator-trim-sprocket-assembly-inspection-and-modification/documents"}}