{"id":"F2006B10378","name":"AD/HS 125/100 Amdt 1 - Fuselage - Windscreen Centre Pillar","slug":"ad-hs-125-100-amdt-1-fuselage-windscreen-centre-pillar","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116021,"registerId":"commonwealth-F2006B10378-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/100 Amdt 1 - Fuselage - Windscreen Centre Pillar","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 125/100\n\nAmdt 1\n\n\nFuselage - Windscreen Centre Pillar 9/91\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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The document records a change in the AD's listing status: AD/HS 125/100 Amdt 1 has been removed from the public listing because the BAe 125 model is not currently on the Australian register. The supplied text does not state any change to the underlying AD text itself (for example, revocation or amendment of operative requirements); it records only the removal from the schedule on that administrative ground."},"complexity_factors":["Document is very short and contains only an administrative note about removal from the listing.","Operative requirements of the AD (inspections, repairs, compliance times) are not included in the supplied text.","Applicability is narrow and tied to a single aircraft model (BAe 125 series), reducing scope complexity.","Effect depends on external state (whether aircraft are on the national register), creating a dependency on up-to-date register data.","Absence of cross-references or procedural detail increases interpretive uncertainty despite low formal complexity."],"plain_english_summary":"### What this instrument is and what it did\n\n- The entry is an Airworthiness Directive (AD) identified as AD/HS 125/100 Amendment 1, titled “Fuselage - Windscreen Centre Pillar” and dated 9/91. It was issued under the Commonwealth Civil Aviation Regulations and appears in the Civil Aviation Safety Authority schedule of Airworthiness Directives. The AD applies to British Aerospace BAe 125 series aeroplanes. (AD/HS 125/100 Amdt 1 (9/91))\n\n### What the available record now shows\n\n- The record states that the AD’s contents have been removed from the public listing because the aircraft model is not currently on the Australian aircraft register. The supplied text does not include the AD’s operative requirements (for example, any specific inspection, modification, or compliance times). (AD/HS 125/100 Amdt 1 (9/91))\n\n### Who this would affect and who decides\n\n- If the AD had active effect, the immediate parties affected would be owners and operators of BAe 125 series aircraft registered in Australia, who would bear any direct compliance costs for inspections, repairs or modifications specified by the AD. The listing and removal action sit with the Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations framework. (Schedule of Airworthiness Directives header; AD identifier)\n\n### Why this matters mechanically (policy and implementation lens)\n\n- Purpose claim: Airworthiness Directives are issued to address identified safety or airworthiness issues on specific aircraft types. The supplied record does not state the specific airworthiness problem or the remedial actions required by this AD, so the claim that this AD addressed a particular defect is not verifiable from the text alone. (AD identifier)\n\n- Costs and who pays: Where an AD specifies inspections or repairs, owners/operators normally pay the direct compliance costs. Because the BAe 125 series is not on the Australian register according to the record, no immediate compliance cost to Australian-registered operators is indicated in the supplied text. (Removal note)\n\n- Incentives and behaviour: Listing an AD creates an incentive for operators to comply (to retain airworthiness certification). Removing the AD from the listing (because no aircraft of that type are on the register) reduces immediate regulatory pressure and administrative follow-up in Australia; the supplied text does not indicate whether the AD is revoked internationally or remains in other jurisdictions. (Removal note)\n\n- Implementation risk and discretion: The action recorded is administrative removal from the listing based on register status. That reflects exercise of listing/administrative discretion by the authority; the supplied text does not describe any further enforcement, revocation, or conditions for reinstatement. (Removal note)\n\n### Trade-offs and opportunity costs evident from the text\n\n- Trade-off visible in the record: maintaining an AD listing when no affected aircraft are on the national register imposes administrative overhead on the regulator with little immediate compliance benefit; removing the listing reduces that overhead but also reduces the visibility of the AD in the national schedule. The supplied material contains no additional data on monitoring, cross-jurisdictional effects, or whether owners overseas remain subject to the AD.\n\n### Bottom line\n\n- The document is a short administrative record showing that AD/HS 125/100 Amdt 1 (Fuselage - Windscreen Centre Pillar) for BAe 125 aircraft was removed from the Australian AD listing because that aircraft type is not currently registered in Australia. The document does not provide the AD’s operative requirements, compliance dates, or technical detail, so any claim about the AD’s exact requirements or safety issue is not supported by the supplied text. (AD/HS 125/100 Amdt 1 (9/91))"},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"Not applicable — this is a withdrawn directive with no active scope."},"complexity_factors":["Document is essentially a placeholder or tombstone entry (1 paragraph of substance)","No operative provisions, technical requirements, or compliance instructions remain","No defined terms, cross-references, or conditional logic","Content explicitly states it has been 'removed from the listing'"],"plain_english_summary":"This document is an **Airworthiness Directive (AD)** — a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) that requires aircraft owners or operators to inspect or fix specific problems.\n\n**What it covers:**\n- **Aircraft type:** British Aerospace BAe 125 series business jets\n- **Issue:** The windscreen centre pillar (the structural frame between the front windows of the cockpit)\n- **Original date:** September 1991 (indicated by \"9/91\")\n\n**Current status:**\nThis directive has been **removed from active use** because no BAe 125 aircraft are currently registered in Australia. In other words, CASA no longer enforces this safety requirement because there are no planes of this type flying under Australian registration that would need the fix.\n\n**Why this matters:**\nAirworthiness Directives are critical safety tools. Even though this particular one is inactive, it illustrates how aviation safety works: when a structural weakness is discovered, regulators mandate repairs — and when the affected aircraft leave the fleet, the directive becomes redundant."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-100-amdt-1-fuselage-windscreen-centre-pillar","history":"/api/acts/ad-hs-125-100-amdt-1-fuselage-windscreen-centre-pillar/history","analysis":"/api/acts/ad-hs-125-100-amdt-1-fuselage-windscreen-centre-pillar/analysis","conflicts":"/api/acts/ad-hs-125-100-amdt-1-fuselage-windscreen-centre-pillar/conflicts","importantCases":"/api/acts/ad-hs-125-100-amdt-1-fuselage-windscreen-centre-pillar/important-cases","documents":"/api/acts/ad-hs-125-100-amdt-1-fuselage-windscreen-centre-pillar/documents"}}