{"id":"F2006B09573","name":"AD/ENST 28/18 - Alternator Field Cable Protection - Modification","slug":"ad-enst-28-18-alternator-field-cable-protection-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54253,"registerId":"commonwealth-F2006B09573-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ENST 28/18 - Alternator Field Cable Protection -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)  Enstrom F-28 Series Helicopters\n\n \n\nAD/ENST 28/18 Alternator Field Cable Protection - Modification 12/77\n\nApplicability: All models.\n\n \n\nRequirement: Install a circuit protective device (i.e. in line fuse or circuit breaker) in the field cable 28-3 (or 28-1 when optional overvoltage relay is fitted) as close as practical to the battery master relay connection.\n\n \n\nNote: Air Navigation Order 108.32 Appendix 3, Table 6 provides a suitable cable and circuit protector co-ordination chart.\n\n \n\nCompliance: 1. Before issue of Certificate of Airworthiness on all aircraft certificated after 28 February 1978.\n\n \n\n2. All other aircraft within 100 hours time in service after 28 February 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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1171},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow, technical scope focused solely on alternator field cable protection for the Enstrom F-28 series. There is no evidence of scope creep or expansion beyond the initial safety modification requirement."},"complexity_factors":["Single, straightforward mechanical requirement (install one component)","Minimal defined terms (only standard aviation terminology)","Only one cross-reference (to Air Navigation Order 108.32, and only as a helpful note rather than mandatory reading)","Clear binary applicability (all models)","Simple compliance timeline based on certification date"],"plain_english_summary":"Owners/operators of Enstrom F‑28 series helicopters must install a protective device (fuse or circuit breaker) on the alternator field cable, fitted as close as possible to the battery master relay.  \n\nThe AD is mandatory to prevent cable faults from causing overheating or fire; it applied to all F‑28s, with compliance deadlines tied to the 28 Feb 1978 certification cutoff (pre‑certification aircraft required installation before registration; in‑service aircraft had 100 flight hours to comply)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-enst-28-18-alternator-field-cable-protection-modification","history":"/api/acts/ad-enst-28-18-alternator-field-cable-protection-modification/history","analysis":"/api/acts/ad-enst-28-18-alternator-field-cable-protection-modification/analysis","conflicts":"/api/acts/ad-enst-28-18-alternator-field-cable-protection-modification/conflicts","importantCases":"/api/acts/ad-enst-28-18-alternator-field-cable-protection-modification/important-cases","documents":"/api/acts/ad-enst-28-18-alternator-field-cable-protection-modification/documents"}}