{"id":"F2006B10285","name":"AD/GENERAL/54 - Magnetic Compasses Fitted in Compliance with ANO 20.18 - Calibration","slug":"ad-general-54-magnetic-compasses-fitted-in-compliance-with-ano-20-18-calibration","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55975,"registerId":"commonwealth-F2006B10285-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GENERAL/54 - Magnetic Compasses Fitted in Compliance with ANO 20.18 - Calibration","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)  Aircraft - General\n\n \n\nAD/GENERAL/54 Magnetic Compasses Fitted in Compliance NK\n\nwith ANO 20.18 - Calibration\n\nApplicability:  All aircraft intended for certification after 31 July 1978. Document: ANO 108.6.\n\nCompliance: Before issue of Australian Certificate of Airworthiness.\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":1177},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains a narrow, technical focus on compass calibration requirements for airworthiness certification. There is no evidence of scope expansion beyond the original safety purpose of ensuring accurate magnetic navigation instruments."},"complexity_factors":["Minimal length (under 150 words of substantive text)","Single, unambiguous compliance requirement (calibration before certification)","No nested exceptions or conditional clauses","References external technical standards (ANO 20.18, ANO 108.6) rather than complex internal cross-references","Broad applicability statement with clear cut-off date (31 July 1978)"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — a mandatory safety rule issued by the Civil Aviation Safety Authority (CASA) that aircraft owners must follow to keep their planes legally airworthy.\n\n**What it requires:** Any magnetic compass fitted to an aircraft must be properly calibrated **before** the aircraft is issued with an Australian Certificate of Airworthiness (the official document proving a plane is safe to fly).\n\n**Who it affects:** All aircraft that were intended for certification after 31 July 1978 — essentially most modern aircraft operating in Australia.\n\n**Why it matters:** A faulty compass can send a pilot off course. This rule ensures navigation instruments are accurate before an aircraft ever takes to the skies, referencing technical standards set out in Air Navigation Orders (ANO) 20.18 and 108.6."}},"importantCases":[],"_links":{"self":"/api/acts/ad-general-54-magnetic-compasses-fitted-in-compliance-with-ano-20-18-calibration","history":"/api/acts/ad-general-54-magnetic-compasses-fitted-in-compliance-with-ano-20-18-calibration/history","analysis":"/api/acts/ad-general-54-magnetic-compasses-fitted-in-compliance-with-ano-20-18-calibration/analysis","conflicts":"/api/acts/ad-general-54-magnetic-compasses-fitted-in-compliance-with-ano-20-18-calibration/conflicts","importantCases":"/api/acts/ad-general-54-magnetic-compasses-fitted-in-compliance-with-ano-20-18-calibration/important-cases","documents":"/api/acts/ad-general-54-magnetic-compasses-fitted-in-compliance-with-ano-20-18-calibration/documents"}}