{"id":"F2006B10481","name":"AD/HS 125/42 Amdt 1 - Hydraulic Brake Control Knife Edges - Inspection","slug":"ad-hs-125-42-amdt-1-hydraulic-brake-control-knife-edges-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116225,"registerId":"commonwealth-F2006B10481-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/42 Amdt 1 - Hydraulic Brake Control Knife Edges - Inspection","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)  British Aerospace BAe 125 Series Aeroplanes\n\n \n\nAD/HS 125/42\n\nAmdt 1\n\n\nHydraulic Brake Control Knife Edges - Inspection 5/76\n\n \n\nThis AD contents has been removed from the listing because the aircraft model is not currently on the register.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"Not applicable — this is a withdrawn/nullified directive with no current operative scope."},"complexity_factors":["Document is essentially a placeholder or stub — no operative provisions remain","No defined terms, cross-references, or conditional logic present","Single sentence of substantive content ('This AD contents has been removed...')","No legislative machinery or enforcement mechanisms described","Extremely short (effectively one paragraph of meaningful text)"],"plain_english_summary":"This document is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it says:**\n- The directive originally required inspections of **hydraulic brake control knife edges** on **British Aerospace BAe 125 series aeroplanes** (business jets).\n- However, **the content has been removed** because these specific aircraft are **no longer registered in Australia** — meaning none are currently flying under Australian registration.\n\n**Who it affects:**\n- Originally: Owners and operators of BAe 125 aircraft in Australia.\n- Currently: **Nobody** — the directive is effectively dormant because the aircraft type isn't on Australia's register.\n\n**Why it matters:**\n- Airworthiness Directives are critical safety tools. They force fixes for known defects before aircraft can fly.\n- This shows how aviation safety regulation adapts: when aircraft types leave the fleet, their specific safety notices get shelved to keep the regulatory framework clean and relevant."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The original scope (an AD requiring inspection of hydraulic brake control knife edges on BAe 125 Series aeroplanes) is not present in the current listing: the entry has been removed because the model is not on the register, so the AD as listed does not currently apply to any registered aircraft (AD/HS 125/42 Amdt 1). The source does not provide the original operative text, so it is not possible from this document alone to compare detailed original obligations to the present state."},"complexity_factors":["Very short source text containing only an AD identifier, title and a removal notice.","Absence of operative provisions: no inspection procedures, intervals, compliance deadlines or enforcement details are provided.","Dependency on external data (aircraft register status) to determine applicability — the removal is tied to register membership rather than substantive AD content.","Single aircraft type referenced (BAe 125 Series) limits scope but also means applicability is contingent on registry changes.","Administrative nature of the entry (listing removal) rather than substantive regulatory amendment reduces legal complexity."],"plain_english_summary":"The instrument (AD/HS 125/42 Amdt 1) was an airworthiness directive calling for inspection of hydraulic brake control knife edges on British Aerospace BAe 125 Series aeroplanes. The public listing for this AD has been removed because that aircraft model is not currently on the register. The source gives no operative compliance text, schedule, or enforcement details."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-42-amdt-1-hydraulic-brake-control-knife-edges-inspection","history":"/api/acts/ad-hs-125-42-amdt-1-hydraulic-brake-control-knife-edges-inspection/history","analysis":"/api/acts/ad-hs-125-42-amdt-1-hydraulic-brake-control-knife-edges-inspection/analysis","conflicts":"/api/acts/ad-hs-125-42-amdt-1-hydraulic-brake-control-knife-edges-inspection/conflicts","importantCases":"/api/acts/ad-hs-125-42-amdt-1-hydraulic-brake-control-knife-edges-inspection/important-cases","documents":"/api/acts/ad-hs-125-42-amdt-1-hydraulic-brake-control-knife-edges-inspection/documents"}}