{"id":"F2006B06487","name":"AD/RAD/25 - Bayside VHF Transceiver Modification or Retirement","slug":"ad-rad-25-bayside-vhf-transceiver-modification-or-retirement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48019,"registerId":"commonwealth-F2006B06487-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RAD/25 - Bayside VHF Transceiver Modification or Retirement","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/25  Bayside VHF Transceiver Modification or Retirement\n\nApplicability: BEI-990, BEI-990H, BEI-990E, BEI-990P.\n\n# 4/74\n\n \n\nRequirement: 1. Modify all models of Bayside BEI-990 series VHF transceiver so as to reduce the level of spurious emissions to at least 40 db below the fundamental radiated frequency; or\n\n \n\n2. Retire the transceiver from service. Compliance: Before 1 December 1974.\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":2213},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains a narrow, technical scope focused exclusively on the Bayside BEI-990 series transceivers and the specific safety hazard of spurious emissions. It has not expanded beyond the original equipment-safety concern."},"complexity_factors":["Single, explicitly listed equipment category (four specific Bayside models)","Binary compliance pathway (modify OR retire) with no exceptions or conditions","Single, measurable technical standard (40 dB suppression level)","No defined terms, cross-references, or nested legislative provisions","Fixed compliance deadline with no staging or extension mechanisms"],"plain_english_summary":"**What this is**\nAn airworthiness directive (a mandatory safety rule) issued by the Civil Aviation Safety Authority targeting a specific model of aircraft radio equipment.\n\n**Who it affects**\nOwners and operators of aircraft fitted with Bayside BEI-990 series VHF transceivers (specifically models BEI-990, BEI-990H, BEI-990E, and BEI-990P).\n\n**What it requires**\nBy 1 December 1974, owners had to choose one of two options:\n*   **Modify** the radio to reduce unwanted signal interference (called \"spurious emissions\") to at least 40 decibels below the main transmission frequency; or\n*   **Retire** the equipment completely (remove it from aircraft service).\n\n**Why it matters**\nThis rule prevents radio interference that could disrupt critical aircraft communications or navigation signals, ensuring safe operations by mandating either repair or removal of faulty equipment."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rad-25-bayside-vhf-transceiver-modification-or-retirement","history":"/api/acts/ad-rad-25-bayside-vhf-transceiver-modification-or-retirement/history","analysis":"/api/acts/ad-rad-25-bayside-vhf-transceiver-modification-or-retirement/analysis","conflicts":"/api/acts/ad-rad-25-bayside-vhf-transceiver-modification-or-retirement/conflicts","importantCases":"/api/acts/ad-rad-25-bayside-vhf-transceiver-modification-or-retirement/important-cases","documents":"/api/acts/ad-rad-25-bayside-vhf-transceiver-modification-or-retirement/documents"}}