{"id":"F2006B06497","name":"AD/RAD/37 - Narco VHF NAV OBS Gear Assembly - Modification","slug":"ad-rad-37-narco-vhf-nav-obs-gear-assembly-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48050,"registerId":"commonwealth-F2006B06497-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RAD/37 - Narco VHF NAV OBS Gear Assembly - 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/37 Narco VHF NAV OBS Gear Assembly - Modification 9/78\n\nApplicability: All Narco Nav receivers type Nav-121, Nav-122 and Nav-122A and indicators type ID-124.\n\n \n\nDocument: Narco Avionics SB - centreline Nav. No. 6.\n\n \n\nCompliance: Within 100 hours time in service after 30 September 1978.\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":1463},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This maintains its original narrow scope targeting only the specific gear assembly modification for the listed Narco VHF navigation equipment models."},"complexity_factors":["Single compliance obligation with no exceptions or conditions","Specific equipment models explicitly listed","Fixed deadline with simple calculation (100 hours after specified date)","No defined terms, interpretation clauses, or nested logic","Reference to only one external technical document"],"plain_english_summary":"**What this is:** A mandatory safety order (an Airworthiness Directive) requiring a specific mechanical fix for certain aircraft navigation equipment.\n\n**Who it affects:** Owners and operators of aircraft fitted with Narco navigation receivers (models Nav-121, Nav-122, or Nav-122A) and indicator units (model ID-124).\n\n**What you must do:** Modify the VHF NAV OBS Gear Assembly according to the technical instructions in **Narco Avionics Service Bulletin No. 6** (centreline Nav).\n\n**Deadline:** Complete the modification within **100 hours of flight time** after 30 September 1978.\n\n**Why it matters:** This prevents mechanical failures in the navigation system that could compromise an aircraft's ability to determine its position or navigate safely."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rad-37-narco-vhf-nav-obs-gear-assembly-modification","history":"/api/acts/ad-rad-37-narco-vhf-nav-obs-gear-assembly-modification/history","analysis":"/api/acts/ad-rad-37-narco-vhf-nav-obs-gear-assembly-modification/analysis","conflicts":"/api/acts/ad-rad-37-narco-vhf-nav-obs-gear-assembly-modification/conflicts","importantCases":"/api/acts/ad-rad-37-narco-vhf-nav-obs-gear-assembly-modification/important-cases","documents":"/api/acts/ad-rad-37-narco-vhf-nav-obs-gear-assembly-modification/documents"}}