{"id":"F2006B06510","name":"AD/RAD/53 - Australian Domestic Distance Measuring Equipment","slug":"ad-rad-53-australian-domestic-distance-measuring-equipment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48092,"registerId":"commonwealth-F2006B06510-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RAD/53 - Australian Domestic Distance Measuring Equipment","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 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Radio Communication and Navigation Equipment\n\n \n\n# AD/RAD/53 Australian Domestic Distance Measuring Equipment\n\nApplicability: All Australian Domestic Distance Measuring Equipment (DME-A).\n\n \n\nRequirement: Either remove the system from the aircraft or disable the system to prevent its operation.\n\n \n\nCompliance: Prior to 1 January 1996.\n\n# 4/95\n\n \n\nBackground: DME-A operates in the 200 MHz band and this band will not be available for use by aeronautical navigation services after 31 December 1995.\n\n \n\nDME-A ground beacons will not provide a reliable service after 7 December 1995 and will be progressively decommissioned from that date.\n\n \n\nCompliance with this Directive will prevent airborne DME-A systems generating radio interference in the 200 MHz band.\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":2196},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains a tight, technical focus on the decommissioning of obsolete DME-A equipment. There is no evidence of scope expansion beyond the original safety purpose of mandating removal of avionics rendered non-functional by the withdrawal of supporting ground infrastructure and spectrum allocation changes."},"complexity_factors":["Single, unambiguous operative requirement (remove or disable)","No defined terms or interpretation section","No cross-references to other legislative provisions","Clear, absolute compliance deadline with no exceptions or conditions","Narrow, technical scope limited to one specific type of avionics equipment"],"plain_english_summary":"**What this does**\n- Orders aircraft owners and operators to **remove or disable Australian Domestic Distance Measuring Equipment (DME-A)** — a specific type of radio navigation system — before 1 January 1996.\n\n**Who it affects**\n- Anyone operating aircraft fitted with DME-A equipment, which uses the 200 MHz frequency band to calculate distance from ground-based radio beacons.\n\n**Why it matters**\n- The ground stations that DME-A relies on were being switched off progressively from 7 December 1995, meaning the equipment would provide unreliable or false navigation data.\n- The Australian government withdrew the 200 MHz band from aeronautical use entirely after 31 December 1995; any airborne DME-A systems left active would have generated harmful radio interference for other services.\n- This directive prevents unsafe reliance on defunct navigation aids and protects the radio spectrum from interference."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rad-53-australian-domestic-distance-measuring-equipment","history":"/api/acts/ad-rad-53-australian-domestic-distance-measuring-equipment/history","analysis":"/api/acts/ad-rad-53-australian-domestic-distance-measuring-equipment/analysis","conflicts":"/api/acts/ad-rad-53-australian-domestic-distance-measuring-equipment/conflicts","importantCases":"/api/acts/ad-rad-53-australian-domestic-distance-measuring-equipment/important-cases","documents":"/api/acts/ad-rad-53-australian-domestic-distance-measuring-equipment/documents"}}