{"id":"F2006B10542","name":"AD/HS 125/99 - Stall Warning Vane","slug":"ad-hs-125-99-stall-warning-vane","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116347,"registerId":"commonwealth-F2006B10542-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/99 - Stall Warning Vane","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 125/99 Stall Warning Vane  6/89 DM\n\nThis AD contents has been removed from the listing because the aircraft model is not currently on the register.\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a standard administrative record of an Airworthiness Directive. The removal from listing is procedural and reflects the current state of the aircraft register, not a substantive change to the directive's original scope or purpose."},"complexity_factors":["Extremely short document — only a few sentences","No defined terms section","No conditional logic or cross-references to other legislation","Simple administrative removal notice with no substantive legal provisions","Essentially a metadata record rather than operative text"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft. Specifically, this directive (AD/HS 125/99) related to the **stall warning vane** on **British Aerospace BAe 125 series aeroplanes** (business jets).\n\n**What it did:** It required inspection or modification of a small device on the aircraft's wing that warns pilots when the plane is approaching a stall (losing lift). This is critical safety equipment.\n\n**Current status:** The directive has been **removed from the active register** because no BAe 125 aircraft are currently registered in Australia. This means there's no fleet to apply it to, so CASA has taken it off the books — though it could be reinstated if such aircraft return to the Australian register.\n\n**Who it affects:** Previously, operators and maintainers of BAe 125 aircraft in Australia. Currently, nobody — until/unless such aircraft are registered again."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The AD originally applied to British Aerospace BAe 125 series aeroplanes and concerned the stall warning vane (identified as \"AD/HS 125/99 Stall Warning Vane 6/89 DM\"). The provided text records that the AD entry has been removed from the public listing because the BAe 125 model is not currently on the Australian register. In other words, the AD’s operational applicability in Australia has been suspended/removed from the current listing for the stated administrative reason; the supplied entry does not include the original technical requirements or any conditions for reinstatement."},"complexity_factors":["Extremely short and narrowly focused entry (only AD identifier, title, type and removal note).","Absence of the AD’s substantive technical or procedural content in the supplied text.","Applicability depends on external FACT (presence of aircraft on the Australian register) not contained here.","Regulatory provenance is clear (CASA header) but no enforcement, cost, or compliance details are provided.","Administrative action (removal) is stated without procedural detail (no reinstatement criteria or timelines)."],"plain_english_summary":"### What this item is\n\nThis entry is an Airworthiness Directive (AD) record issued under the Commonwealth Civil Aviation Regulations and listed by the Civil Aviation Safety Authority (CASA). The entry is titled “AD/HS 125/99 — Stall Warning Vane” and names the affected type as British Aerospace BAe 125 series aeroplanes (see header and title: \"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\" and \"AD/HS 125/99 Stall Warning Vane 6/89 DM\").\n\n### What the entry did mechanically\n\n- The record identifies a directive that concerned the aircraft’s stall warning vane (title: \"Stall Warning Vane\").\n- The actual technical requirements, mandated actions, and compliance procedures are not present in the text provided — the entry shows only the AD identifier, subject and date. (See line: \"AD/HS 125/99 Stall Warning Vane 6/89 DM\").\n\n### What happened to it\n\n- The AD entry has been removed from the public listing because the aircraft model is not currently on the Australian register. (See: \"This AD contents has been removed from the listing because the aircraft model is not currently on the register.\")\n\n### Who decides and who is affected (source-grounded)\n\n- Decision-maker noted in this text: the Civil Aviation Safety Authority (CASA) — the regulator named in the header. (See header: \"CIVIL AVIATION SAFETY AUTHORITY\").\n- The entry names British Aerospace BAe 125 series aeroplanes as the affected type. The text does not set out specific persons or organisations who must pay or perform work. The text also does not include the AD’s specific actions or compliance requirements, so it does not state who would bear costs or how behaviour would change in practice. (See: entry title and removal note.)\n\n### Why it matters and practical implications (limited to what the text shows)\n\n- Airworthiness Directives are instruments that, when in force and published with their content, specify mandatory maintenance, inspection or modification tasks for particular aircraft types. This record indicates an AD existed for the BAe 125 stall warning vane, but the substantive requirements are not provided here. (This is an observation about the absence of content in this entry.)\n- The visible administrative outcome is that the AD is no longer listed in the current register because no BAe 125 aircraft are registered in Australia; that means, per the provided text, the AD is not active in practice for Australian-registered aircraft at this time. (See removal note.)\n\n### Costs, incentives, trade-offs and implementation notes (what the source permits us to say)\n\n- The text does not specify compliance costs, who would pay them, enforcement procedures, or deadlines. Therefore those details cannot be reported from this source.\n- Because the AD content itself is absent, concrete trade-offs (for example, between operator costs and safety benefit) are not set out in the provided text. The only concrete administrative effect stated is removal from the listing due to lack of registered aircraft, which removes any immediate compliance obligation in Australia according to this record. (See: removal note.)\n\n### Risks and discretion visible in the source\n\n- The only exercise of administrative discretion recorded here is the removal of the AD from the listing on the stated ground that the model is not on the register. The text does not describe criteria, review processes or timelines for reinstatement should the model reappear on the register. (See: removal note.)\n\nSummary conclusion (source-limited): The record identifies an AD concerning the stall warning vane for BAe 125 aeroplanes but does not include the directive’s technical content. The only explicit factual update in the material provided is that the AD entry has been removed from the public listing because no BAe 125 aircraft are currently registered in Australia."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-99-stall-warning-vane","history":"/api/acts/ad-hs-125-99-stall-warning-vane/history","analysis":"/api/acts/ad-hs-125-99-stall-warning-vane/analysis","conflicts":"/api/acts/ad-hs-125-99-stall-warning-vane/conflicts","importantCases":"/api/acts/ad-hs-125-99-stall-warning-vane/important-cases","documents":"/api/acts/ad-hs-125-99-stall-warning-vane/documents"}}