{"id":"F2006B02077","name":"AD/AC/18 - Battery Relay Terminal - Insulation","slug":"ad-ac-18-battery-relay-terminal-insulation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41307,"registerId":"commonwealth-F2006B02077-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/18 - Battery Relay Terminal - Insulation","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 NK,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Battery Relay Terminal - Insulation,18\ntitle: Airworthiness Directive - AD/AC/18 - Battery Relay Terminal - Insulation\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/18 Battery Relay Terminal - Insulation NK\n\nApplicability: Models 500, 560E, 680E: S/Nos. 671 to 765. Document:  Aero Commander SL No. 80.\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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2368},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive remains tightly focused on its original purpose: addressing a specific battery terminal insulation defect in a narrow range of aircraft serial numbers. There is no indication of scope creep into broader operational or maintenance requirements."},"complexity_factors":["Extremely brief text (approximately 50 words of substance)","Zero defined legal or technical terms within the instrument","Single action required with no alternatives or exceptions","Incorporates by reference all technical details from an external manufacturer document"],"plain_english_summary":"**What it is:** A mandatory aviation safety rule (called an Airworthiness Directive) issued by the Civil Aviation Safety Authority (CASA) that requires immediate action on specific aircraft.\n\n**Who it affects:** Owners and operators of Twin Commander aircraft (models 500, 560E, and 680E) with serial numbers 671 through 765.\n\n**What you must do:** Immediately follow the instructions in the manufacturer's document \"Aero Commander Service Letter No. 80\" regarding insulation for battery relay terminals. \"Forthwith\" means you must comply right away before the next flight, or as soon as practicable if the aircraft is already grounded.\n\n**Why it matters:** This prevents electrical short circuits or fire risks caused by poor insulation around battery connections. Operating the aircraft without completing this fix makes it unairworthy and illegal to fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-18-battery-relay-terminal-insulation","history":"/api/acts/ad-ac-18-battery-relay-terminal-insulation/history","analysis":"/api/acts/ad-ac-18-battery-relay-terminal-insulation/analysis","conflicts":"/api/acts/ad-ac-18-battery-relay-terminal-insulation/conflicts","importantCases":"/api/acts/ad-ac-18-battery-relay-terminal-insulation/important-cases","documents":"/api/acts/ad-ac-18-battery-relay-terminal-insulation/documents"}}