{"id":"F2006L03634","name":"AD/GENERAL/54 - Magnetic Compasses Fitted in Compliance with ANO 20.18 - Calibration - CANCELLED","slug":"ad-general-54-magnetic-compasses-fitted-in-compliance-with-ano-20-18-calibration-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":137345,"registerId":"commonwealth-F2006L03634-current","compilationNumber":null,"startDate":"2026-04-03","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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GENERAL/54 - Magnetic Compasses Fitted in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 - CANCELLED","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 20.2\ntitle: AIRCRAFT\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\n \n\nAIRWORTHINESS DIRECTIVE\n\nOn the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive AD/GENERAL/54.\n\n### Aircraft - General\n\n| AD/GENERAL/54 | Magnetic Compasses Fitted in  Compliance with ANO 20.18 - Calibration | 12/2006 |\n| --- | --- | --- |\n\n\n \n\n| Requirement: | CANCELLED. |\n| --- | --- |\n|  | This AD is cancelled on 23 November 2006. |\n| Background: | Requirements superseded by new regulations. |\n\n\n![](image.001.png)\n\nJames Coyne  Delegate of the Civil Aviation Safety Authority\n\n29 September 2006\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2328},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument performs a straightforward revocation of a previous Airworthiness Directive. It does not expand the scope of regulation; rather, it terminates the regulatory effect of AD/GENERAL/54 because its requirements have been superseded by new regulations."},"complexity_factors":["Single operative provision (cancellation/revocation)","No substantive regulatory requirements or compliance obligations imposed","No defined terms, interpretation sections, or complex cross-references","Extremely short length (less than one page)"],"plain_english_summary":"This document **cancels** a previous aviation safety rule about magnetic compasses.\n\n**What it does:**\n- Revokes Airworthiness Directive AD/GENERAL/54, which previously required calibration of magnetic compasses fitted in aircraft under old rules (ANO 20.18).\n- The cancellation took effect on 23 November 2006.\n\n**Why it matters:**\nOlder aircraft were required to have their magnetic compasses calibrated to ensure accurate navigation. These specific calibration requirements have been **superseded by new regulations**, meaning the old rule is no longer needed. Aircraft operators no longer need to comply with the specific requirements of AD/GENERAL/54, though they must still follow the newer rules that replaced it.\n\n**Key point:** This directive is now of historical interest only, as the calibration requirements have been absorbed into or replaced by subsequent aviation safety regulations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-general-54-magnetic-compasses-fitted-in-compliance-with-ano-20-18-calibration-cancelled","history":"/api/acts/ad-general-54-magnetic-compasses-fitted-in-compliance-with-ano-20-18-calibration-cancelled/history","analysis":"/api/acts/ad-general-54-magnetic-compasses-fitted-in-compliance-with-ano-20-18-calibration-cancelled/analysis","conflicts":"/api/acts/ad-general-54-magnetic-compasses-fitted-in-compliance-with-ano-20-18-calibration-cancelled/conflicts","importantCases":"/api/acts/ad-general-54-magnetic-compasses-fitted-in-compliance-with-ano-20-18-calibration-cancelled/important-cases","documents":"/api/acts/ad-general-54-magnetic-compasses-fitted-in-compliance-with-ano-20-18-calibration-cancelled/documents"}}