{"id":"F2006B06478","name":"AD/RAD/11 Amdt 2 - VHF Transceiver - Modification","slug":"ad-rad-11-amdt-2-vhf-transceiver-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47991,"registerId":"commonwealth-F2006B06478-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RAD/11 Amdt 2 - VHF Transceiver - Modification","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\nAD/RAD/11\n\nAmdt 2\n\n\nVHF Transceiver - Modification 6/66\n\n \n\nApplicability: All AN/ARC/1 series VHF Transceivers.\n\n \n\nRequirement: Modify the equipment to reduce second harmonic radiation from the transmitter to a level at least 40 db. below the carrier power at the fundamental frequency.\n\n \n\nNote: Tests carried out on several units indicate that at least 25 db. additional attenuation of a second harmonic power will be necessary to ensure a total attenuation of 40 db. in all cases.\n\n \n\nCompliance: Before 31 July 1966.\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":2001},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"As Amendment 2, this maintains the original scope of ensuring electromagnetic compatibility and flight safety for aircraft using AN/ARC/1 radio equipment. There is no indication of scope creep beyond the initial purpose of controlling radio interference from this specific transceiver series."},"complexity_factors":["Technical terminology requires basic radio engineering knowledge (decibels, harmonic radiation, carrier power, fundamental frequency)","Single, unambiguous requirement with a clear numerical threshold (40 db attenuation)","No cross-references to other legislative provisions or conditional logic","Applicability limited to a single, specific equipment series (AN/ARC/1)"],"plain_english_summary":"This AD requires owners/operators of AN/ARC/1 series VHF transceivers to modify the radios so second-harmonic radiation is suppressed to at least 40 dB below the main transmission. It affects aircraft using these vintage military-style transceivers because excess harmonic emissions can interfere with other radio communications and create safety risks. Compliance was required by 31 July 1966."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rad-11-amdt-2-vhf-transceiver-modification","history":"/api/acts/ad-rad-11-amdt-2-vhf-transceiver-modification/history","analysis":"/api/acts/ad-rad-11-amdt-2-vhf-transceiver-modification/analysis","conflicts":"/api/acts/ad-rad-11-amdt-2-vhf-transceiver-modification/conflicts","importantCases":"/api/acts/ad-rad-11-amdt-2-vhf-transceiver-modification/important-cases","documents":"/api/acts/ad-rad-11-amdt-2-vhf-transceiver-modification/documents"}}