{"id":"F2006B01834","name":"AD/A109/50 - Radio Master Switch Electrical System","slug":"ad-a109-50-radio-master-switch-electrical-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41032,"registerId":"commonwealth-F2006B01834-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \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\nAgusta A109 Series Helicopters","sortOrder":0},{"sectionNumber":"AD/A109/50 Radio Master Switch Electrica","sectionType":"part","heading":"AD/A109/50 Radio Master Switch Electrical System 3/2004","content":"# AD/A109/50 Radio Master Switch Electrical System 3/2004\n\nApplicability: A109E series helicopters serial numbers 11048, 11049 and 11067. Requirement: Modify the radio master switch electrical system in accordance with Agusta\n\nMandatory Bollettino Tecnico 109EP-40 dated 25 November 2003.\n\nNote: ENAC AD 2003-385 refers.\n\nCompliance: No later than 31 March 2004.\n\nThis Airworthiness Directive becomes effective on 18 March 2004.\n\nBackground: The Italian Ente Nazionale per l’Aviazone Civile has advised that Agusta, whilst carrying out an inspection of a A109E helicopter’s electrical generation system, identified anomalies in the Comm/Nav 1 wiring configuration. This Directive requires the reconfiguration of the radio master wiring to correct the anomaly.\n\n![](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 4 February 2004\n\n![](image.001.png)","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific wiring anomaly identified during inspection. The scope remains precisely limited to the three identified aircraft and the specific electrical system modification required. No scope creep is evident."},"complexity_factors":["Very short document (approximately 200 words)","Only 3 specific aircraft affected by serial number","Single, unambiguous requirement with clear reference to external technical document","No defined terms section","No nested conditions or exceptions","Simple compliance deadline with no alternative methods or phased implementation","Minimal cross-referencing (only one external technical bulletin and one related Italian AD)"],"plain_english_summary":"This safety order requires owners/operators of three specific Agusta A109E helicopters (S/N 11048, 11049, 11067) to rewire the radio master switch electrical system per Agusta Bollettino Tecnico 109EP-40 by 31 March 2004. It affects those helicopter owners and maintenance engineers and prevents communication/navigation failures or fire risk from the incorrect wiring."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope is limited to correcting a wiring anomaly on the three serial-numbered A109E helicopters listed. The instrument requires a manufacturer-specified modification and sets a compliance deadline; nothing in the text indicates an expansion or narrowing of that original corrective scope."},"complexity_factors":["Very narrow applicability — only three specific A109E serial numbers are affected.","Single prescriptive action — modify radio master switch electrical system per Agusta Mandatory Bollettino Tecnico 109EP-40 (date and document referenced).","Clear compliance deadline (31 March 2004) and effective date (18 March 2004) reduce procedural ambiguity.","Technical work (electrical wiring reconfiguration) requires qualified maintenance resources and potential aircraft downtime.","Direct regulatory basis cited (CASR subreg 39.1(1)) and cross-reference to ENAC AD increase formal enforceability.","Operators bear the cost and scheduling burden; the AD delegates specific corrective method to the manufacturer document, limiting alternative compliance routes."],"plain_english_summary":"Modifies the radio master switch wiring on three Agusta A109E helicopters (serials 11048, 11049, 11067) by requiring operators to perform the change described in Agusta Mandatory Bollettino Tecnico 109EP-40 (25 Nov 2003). CASA issued the AD under CASR subreg 39.1(1); compliance is required by 31 March 2004 and the AD is effective 18 March 2004. The work corrects an identified Comm/Nav‑1 wiring anomaly; operators/owners pay for and schedule the technical reconfiguration."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a109-50-radio-master-switch-electrical-system","history":"/api/acts/ad-a109-50-radio-master-switch-electrical-system/history","analysis":"/api/acts/ad-a109-50-radio-master-switch-electrical-system/analysis","conflicts":"/api/acts/ad-a109-50-radio-master-switch-electrical-system/conflicts","importantCases":"/api/acts/ad-a109-50-radio-master-switch-electrical-system/important-cases","documents":"/api/acts/ad-a109-50-radio-master-switch-electrical-system/documents"}}