{"id":"F2006B06536","name":"AD/RAD/80 - AT150 Transponder","slug":"ad-rad-80-at150-transponder","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48207,"registerId":"commonwealth-F2006B06536-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nRadio Communication and Navigation Equipment","sortOrder":0},{"sectionNumber":"AD/RAD/80 AT150 Transponder 8/2004","sectionType":"part","heading":"AD/RAD/80 AT150 Transponder 8/2004","content":"# AD/RAD/80 AT150 Transponder 8/2004\n\nApplicability: Narco Avionics Inc. AT150 transponders with \"Chassis Level A\", serial numbers (S/Ns) 10000 through 12598 inclusive.\n\nRequirement: 1. For transponders that are not modified in accordance with Narco Service Bulletin (SB) AT150 No. 1 dated 29 July 1977, and with a S/N identified in the Applicability Statement, accomplish Narco SB AT150 No. 6, dated 31 January 2003.\n\n    2. For transponders that are modified in accordance with Narco SB AT150 No. 1, and with a S/N identified in the Applicability Statement, accomplish the following:\n\n    Change transponder \"Chassis Level” marking to “B”,\n\n    b. Test the transponders in accordance with the Testing the Modification paragraph of Narco SB AT150 No. 6, and\n\n    c. Perform a bench test to the transponder before returning it to service.\n\nNote 1: Information on bench testing can be found in AT150 Manual P/N 03606- 0600.\n\nNote 2: FAA AD 2004-08-16 Amdt 39-13586 refers.\n\nCompliance: For Requirements 1 and 2 \\-Within six months after the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 5 August 2004.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive’s scope is confined to the stated serial number range and chassis level and prescribes corrective actions and tests. The text contains no amendment history or sign that the applicability or required actions were expanded or narrowed beyond the stated measures."},"complexity_factors":["Narrow applicability defined by chassis level and a specific serial number range (S/Ns 10000–12598)","Conditional requirements depending on whether earlier modification (SB AT150 No. 1) was done","Multiple external technical references: Narco SB AT150 No. 1, SB No. 6, AT150 Manual P/N 03606‑0600","Required functional testing and bench test before return to service (operational/compliance burden)","Fixed compliance timeframe (six months) and an explicit effective date (5 August 2004)","Cross‑reference to FAA AD 2004‑08‑16 (additional regulatory linkage)"],"plain_english_summary":"This AD requires Narco AT150 transponders with “Chassis Level A” and serial numbers 10000–12598 to be brought into a specified configuration: either modified per Narco SB AT150 No. 6, or, if already modified by SB No. 1, relabelled as “B”, tested per SB No. 6 and bench‑tested before return to service. It affects aircraft owners/operators and maintenance organisations, who must perform and pay for the work within six months of the effective date (5 August 2004)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive targeting a specific safety defect in a specific product line. It has not expanded beyond its original purpose of mandating corrective action for unsafe Narco AT150 transponders."},"complexity_factors":["Short, single-purpose document (approximately 250 words)","Only 2 main requirements with clear conditional branching (modified vs unmodified units)","Minimal defined terms (only standard aviation abbreviations like S/N, SB, P/N)","Simple compliance structure (single deadline, no phased compliance)","No cross-references to other legislation or regulations beyond a single note referencing the equivalent FAA directive","Clear applicability statement using objective criteria (serial number range)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Narco AT150 transponders (serials 10000–12598 with \"Chassis Level A\") to perform mandated safety modifications and testing to correct a known defect. Affected units must be upgraded or relabelled and bench-tested per Narco service bulletins; compliance was required within six months of 5 Aug 2004. It matters because faulty transponders can prevent ATC from identifying and tracking aircraft, creating a serious safety risk."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-rad-80-at150-transponder","history":"/api/acts/ad-rad-80-at150-transponder/history","analysis":"/api/acts/ad-rad-80-at150-transponder/analysis","conflicts":"/api/acts/ad-rad-80-at150-transponder/conflicts","importantCases":"/api/acts/ad-rad-80-at150-transponder/important-cases","documents":"/api/acts/ad-rad-80-at150-transponder/documents"}}