{"id":"F2006B02599","name":"AD/B-2/27 - Tail Rotor Blades Strike Indicators - Installation","slug":"ad-b-2-27-tail-rotor-blades-strike-indicators-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41889,"registerId":"commonwealth-F2006B02599-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B-2/27 - Tail Rotor Blades Strike Indicators - Installation","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)  Brantly B-2 Series Helicopters\n\n \n\nAD/B-2/27 Tail Rotor Blades Strike Indicators - Installation 2/68\n\nApplicability: All model B2, B2A and B2B prior to S/No. 474. Document:  Brantly SL No. 73.\n\nCompliance: Within 100 hours time in service after 21 March 1968.\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\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1495},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow technical scope: mandating installation of specific safety equipment on defined legacy aircraft models. No evidence of scope creep or expansion beyond the original airworthiness safety purpose."},"complexity_factors":["Single external technical reference requiring cross-consultation (Brantly Service Letter No. 73)","Applicability limited by specific aircraft model numbers and serial number cut-off (prior to S/No. 474)","Industry-specific term 'time in service' requiring aviation operational knowledge","No conditional exceptions, nested definitions, or cross-references to other legislation"],"plain_english_summary":"A safety directive requires owners/operators of Brantly B‑2 series helicopters (B2, B2A, B2B) with serial numbers below 474 to install tail‑rotor blade‑strike indicators within 100 flight hours from 21 March 1968, using the instructions in Brantly Service Letter No. 73. The devices reveal otherwise hidden tail‑rotor strikes, helping detect damage that could lead to catastrophic loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b-2-27-tail-rotor-blades-strike-indicators-installation","history":"/api/acts/ad-b-2-27-tail-rotor-blades-strike-indicators-installation/history","analysis":"/api/acts/ad-b-2-27-tail-rotor-blades-strike-indicators-installation/analysis","conflicts":"/api/acts/ad-b-2-27-tail-rotor-blades-strike-indicators-installation/conflicts","importantCases":"/api/acts/ad-b-2-27-tail-rotor-blades-strike-indicators-installation/important-cases","documents":"/api/acts/ad-b-2-27-tail-rotor-blades-strike-indicators-installation/documents"}}