{"id":"F2006B09492","name":"AD/EMB-110/51 - Generator Control Unit Overvoltage Protection Circuit","slug":"ad-emb-110-51-generator-control-unit-overvoltage-protection-circuit","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54021,"registerId":"commonwealth-F2006B09492-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EMB-110/51 - Generator Control Unit Overvoltage Protection Circuit","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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Embraer EMB-110 (Bandeirante) Series Aeroplanes\n\n \n\n# AD/EMB-110/51 Generator Control Unit Overvoltage\n\nProtection Circuit\n\nApplicability: This Directive is applicable to all EMB-110 Bandeirante aircraft.\n\n# 3/96 DM\n\n \n\nRequirement: 1. Perform a functional test of both generator control unit (GCU) overvoltage protection circuits in accordance with Embraer Service Bulletin SB 110-24-0037 dated 6 November 1995.\n\n \n\n2. Replace the GCU with a serviceable unit.\n\n \n\nNote: CTA (Brazil) AD 95-11-02R1 Amdt 39-754 refers.\n\n \n\nCompliance: For Requirement 1 - Within 200 hours time in service or two calendar months, whichever occurs first, after 17 January 1996 and thereafter at intervals not exceeding 600 hours time in service.\n\n \n\nFor Requirement 2 - Before further flight, if the GCU fails the Requirement 1 functional test.\n\n \n\nBackground: Embraer has advised of instances concerning malfunction of voltage control and GCU overvoltage protection circuits. The reported malfunctions may cause damage to the electrical and electronic systems of the aircraft, including complete loss of generated power. Actions specified by this Directive are designed to provide early detection of malfunctioning circuitry.\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":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific technical fault in a specific aircraft type. It has not expanded beyond its original purpose of ensuring GCU overvoltage protection functionality."},"complexity_factors":["Single aircraft type applicability with no conditional exceptions","Only 2 operational requirements with clear sequential logic","Simple binary compliance trigger (pass test / fail test → replace)","No defined terms section — all technical terms are standard aviation maintenance terminology","Single cross-reference to Brazilian aviation authority directive (informational only)","Straightforward time-based compliance schedule with 'whichever occurs first' logic"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Embraer EMB-110 Bandeirante aircraft in Australia to test the overvoltage protection circuits in both generator control units and to replace any unit that fails before the aircraft flies again. It targets prevention of electrical system damage or total power loss.\n\nCompliance: first test within 200 flight hours or 2 months (whichever first) after 17 January 1996, then every 600 flight hours thereafter; failed units must be replaced immediately."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies to all EMB‑110 aircraft and prescribes testing and replacement obligations only; it does not expand the class of affected aircraft or add requirements beyond the specified functional test, recurring intervals, and replacement-on-failure rule."},"complexity_factors":["Narrow applicability: affects a single aircraft type (Embraer EMB‑110), reducing administrative breadth.","Clear, specific actions: one functional test procedure and mandatory replacement on failure.","Defined compliance timing: initial deadline (200 hours time-in-service or 2 months) and recurring interval (every 600 hours), which creates scheduling obligations.","Dependency on manufacturer service bulletin (SB 110‑24‑0037) for test procedure, requiring access to and reliance on that document.","Operational impact risk: failed test requires replacement before further flight, potentially causing aircraft grounding and parts logistics.","Safety‑critical electrical system context increases implementation attention but does not add procedural ambiguity."],"plain_english_summary":"Mandates an initial and recurring functional test of both generator control unit (GCU) overvoltage protection circuits on all Embraer EMB‑110 aircraft, and requires replacement of any GCU that fails the test before further flight. Applies to aircraft owners/operators and maintenance organisations, directs tests to follow Embraer Service Bulletin SB 110‑24‑0037, and aims to detect malfunctions that can damage electrical/electronic systems or cause loss of generated power; owners bear test and replacement costs and may face aircraft downtime."}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-110-51-generator-control-unit-overvoltage-protection-circuit","history":"/api/acts/ad-emb-110-51-generator-control-unit-overvoltage-protection-circuit/history","analysis":"/api/acts/ad-emb-110-51-generator-control-unit-overvoltage-protection-circuit/analysis","conflicts":"/api/acts/ad-emb-110-51-generator-control-unit-overvoltage-protection-circuit/conflicts","importantCases":"/api/acts/ad-emb-110-51-generator-control-unit-overvoltage-protection-circuit/important-cases","documents":"/api/acts/ad-emb-110-51-generator-control-unit-overvoltage-protection-circuit/documents"}}