{"id":"F2006B10512","name":"AD/HS 125/71 - Flap Microswitch Layshaft","slug":"ad-hs-125-71-flap-microswitch-layshaft","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116287,"registerId":"commonwealth-F2006B10512-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/71 - Flap Microswitch Layshaft","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 125/71 Flap Microswitch Layshaft  9/85 DM\n\nThis AD contents has been removed from the listing because the aircraft model is not currently on the register.\n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The entry’s practical scope in Australia has been narrowed: the AD (AD/HS 125/71) is removed from the public listing on the ground that the BAe 125 model is not currently on the Australian register (source: “This AD contents has been removed from the listing because the aircraft model is not currently on the register.”). That removal reduces the AD’s immediate applicability to Australian-registered aircraft because, per the source, there are none of that model on the register. The source does not state whether the AD has been revoked, archived, or will be reinstated if the registration status changes."},"complexity_factors":["Very short source text: only an AD identifier, title, date, and a single removal note.","No substantive technical provisions included (technical requirements absent).","Administrative action tied to a single, concrete trigger (registration status) rather than layered conditions.","Few stakeholders named explicitly (CASA, BAe 125 operators), limiting procedural complexity.","No cross-references to procedures for reinstatement, appeal, or compliance timelines in the source."],"plain_english_summary":"What this document records, mechanically\n\n- The entry is an Airworthiness Directive (AD) record listed under the Commonwealth of Australia’s Civil Aviation Regulations (Part 39) Schedule of Airworthiness Directives (as headed in the source). The AD identifier is AD/HS 125/71, titled “Flap Microswitch Layshaft,” dated 9/85 DM and associated with British Aerospace BAe 125 series aeroplanes (see: “AD/HS 125/71 Flap Microswitch Layshaft  9/85 DM” and the BAe 125 heading).\n- The record states that the AD’s contents have been removed from the listing for the stated reason: “the aircraft model is not currently on the register.”\n\nWho this affects\n\n- The entry would concern owners, operators and maintenance organisations for BAe 125 series aeroplanes on the Australian aircraft register while the AD is listed. (See the AD identifier and the BAe 125 reference.)\n- The administrative actor named in the heading is the Civil Aviation Safety Authority (CASA), which maintains the Schedule of Airworthiness Directives.\n\nWhy this matters and how it operates in practice\n\n- By recording an AD, the Schedule normally identifies mandatory technical instructions that apply to particular aircraft types (the source is a Schedule of Airworthiness Directives). The specific AD here is identified by number and title (AD/HS 125/71, \"Flap Microswitch Layshaft\").\n- The present entry shows the AD has been removed from the public listing because the BAe 125 model is not on the Australian register. The source text states: “This AD contents has been removed from the listing because the aircraft model is not currently on the register.” That is the explicit administrative reason given.\n\nCosts, incentives, compliance burden and decision authority (source-grounded)\n\n- Who pays: If the AD were active and applied to aircraft on the register, compliance costs (inspections, repairs, component replacement, or engineering work) would fall on the aircraft owners/operators and their contracted maintenance providers. The source identifies the AD by number and type but does not specify the remedial measures or costs.\n- Who decides: CASA (as the Schedule’s custodian under the Civil Aviation Regulations heading) is the administrative decision-maker for listing and removal (see the Schedule heading and the removal statement). The removal statement itself gives the operational criterion used: whether the aircraft model is on the register.\n- Behaviour change and incentives: Removal from the Schedule eliminates the immediate obligation attached to this listed AD for any BAe 125 aircraft on the Australian register — in this case there are none, per the explicit reason given. That reduces immediate administrative and compliance obligations for Australian-registered operators of that model because there are no such operators on the register. The source does not state whether the AD is revoked, superseded, or retained off-list for archival purposes.\n- Implementation and practical trade-offs: The administrative decision to remove the AD from the listing is tied to registration status (the stated trigger). This means the scope of domestic regulatory obligations for this particular AD is contingent on aircraft presence on the national register. The source contains no operational detail on re-listing triggers, monitoring, or the substantive technical requirements that the AD would impose if listed.\n\nLimitations of the source text\n\n- The document supplies an identifier, a title, and a single administrative note of removal. It does not supply the AD’s technical content, the compliance actions that were required when the AD was active, cost estimates, enforcement mechanisms, or a process description for reinstatement. The summary above restricts itself to what the source states and to immediate, directly inferable consequences tied to the listing status."},"kimi_summary":{"content_quality":"rejected","complexity_score":1,"rejection_reason":"This is a stub/placeholder entry indicating that an Airworthiness Directive has been removed from the register. It contains no substantive legislative content — only metadata, a header, and a status notice stating 'This AD contents has been removed from the listing.' There are no operative provisions, requirements, or legal text to analyse.","scope_assessment":{"changed":false,"description":"Not applicable — this is a minimal administrative entry indicating removal of content, not substantive legislation with evolving scope."},"complexity_factors":["Document is a stub/placeholder entry only 4 substantive lines long","No operative provisions, definitions, or conditional logic present","No cross-references to other legislation or technical standards","Content explicitly states it has been 'removed from the listing'","Consists entirely of metadata, header information, and a status notice"],"plain_english_summary":"This document is an **Airworthiness Directive (AD)** — a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA). \n\n**What it does:**\n- Originally required inspection or modification of the **flap microswitch layshaft** on **British Aerospace BAe 125 series aircraft** (a type of business jet).\n- Flap microswitches are safety devices that detect whether the aircraft's flaps (movable wing surfaces that help with takeoff and landing) are in the correct position. The \"layshaft\" is a mechanical rod or axle that forms part of this system.\n\n**Current status:**\n- The directive has been **removed from active listing** because no BAe 125 aircraft are currently registered in Australia. CASA no longer needs to enforce this specific safety requirement domestically.\n\n**Who it affects:**\n- Previously: Owners and operators of BAe 125 aircraft in Australia.\n- Currently: No one — the directive is effectively dormant.\n\n**Why it matters:**\nAirworthiness Directives are critical safety tools. They mandate fixes for known defects that could cause accidents. This particular AD addressed a potential mechanical issue with flap position indication — important because incorrect flap settings during takeoff or landing can be catastrophic."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-71-flap-microswitch-layshaft","history":"/api/acts/ad-hs-125-71-flap-microswitch-layshaft/history","analysis":"/api/acts/ad-hs-125-71-flap-microswitch-layshaft/analysis","conflicts":"/api/acts/ad-hs-125-71-flap-microswitch-layshaft/conflicts","importantCases":"/api/acts/ad-hs-125-71-flap-microswitch-layshaft/important-cases","documents":"/api/acts/ad-hs-125-71-flap-microswitch-layshaft/documents"}}