{"id":"F2006B07518","name":"AD/TSA-600/9 - Alternator Field Circuit Protection - Modification","slug":"ad-tsa-600-9-alternator-field-circuit-protection-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50036,"registerId":"commonwealth-F2006B07518-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TSA-600/9 - Alternator Field Circuit Protection - 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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Aerostar (Piper/Ted Smith) 600 and 700 Series Aeroplanes\n\n \n\nAD/TSA-600/9 Alternator Field Circuit Protection - Modification 7/77\n\nApplicability: Part 1: All models 600, 601 and 601P with S/Nos. 60-0001-003 to 60-0056-128,\n\n60-0130-057 to 60-0189-085, 61-0001-004 to 61-0070-129, 61-0132-071 to 61-0186-087 and 62-0001-013, 61P-0157-001 to 61P-0183-012.\n\n \n\nPart 11: 60-0190-086 to 60-0355-127, 61-0191-088 to 61-0352-114, 61P-0192-013 to 61P-0354-109.\n\n \n\nDocument: Ted Smith Corp. SB No. SB600-54.\n\n \n\nCompliance: Within 200 hours time in service after 31 July 1977.\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":1640},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This 1977 Airworthiness Directive maintains its original limited scope as a mandatory safety modification for specific high-performance twin-engine aircraft identified by serial number. There is no evidence of expansion beyond the initial technical remedy for alternator circuit protection."},"complexity_factors":["Highly specific applicability limited to enumerated aircraft serial number ranges across multiple model variants","External incorporation by reference of technical Service Bulletin SB600-54 without reproducing its content in the instrument","Technical aviation terminology (alternator field circuit, time in service) requiring domain knowledge","Bifurcated applicability structure (Part I and Part II) distinguishing early and late production serial numbers"],"plain_english_summary":"**What this does:** This rule requires owners of specific Piper/Ted Smith Aerostar aircraft to modify the **alternator field circuit protection** — a safety system that prevents the aircraft's electrical generator (alternator) from overloading or failing.\n\n**Who it affects:** Owners of Aerostar 600, 601, and 601P model aircraft with specific serial numbers listed in two groups (earlier and later production runs). If your plane's serial number starts with 60-, 61-, or 61P- and falls within the listed ranges, this applies to you.\n\n**What you must do:** Have a mechanic install the modification described in **Ted Smith Service Bulletin SB600-54** within 200 hours of flight time after July 31, 1977.\n\n**Why it matters:** Faulty alternator protection can cause sudden electrical failure in flight, potentially blacking out navigation instruments, radios, and lighting — a serious safety risk for twin-engine aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tsa-600-9-alternator-field-circuit-protection-modification","history":"/api/acts/ad-tsa-600-9-alternator-field-circuit-protection-modification/history","analysis":"/api/acts/ad-tsa-600-9-alternator-field-circuit-protection-modification/analysis","conflicts":"/api/acts/ad-tsa-600-9-alternator-field-circuit-protection-modification/conflicts","importantCases":"/api/acts/ad-tsa-600-9-alternator-field-circuit-protection-modification/important-cases","documents":"/api/acts/ad-tsa-600-9-alternator-field-circuit-protection-modification/documents"}}