{"id":"F2006B07545","name":"AD/VAT/13 - Stall Warning Indicator - Installation","slug":"ad-vat-13-stall-warning-indicator-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50138,"registerId":"commonwealth-F2006B07545-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/VAT/13 - Stall Warning Indicator - 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)  Victa and A.E.S.L. Airtourer Series Aeroplanes\n\n \n\nAD/VAT/13 Stall Warning Indicator - Installation 4/64\n\nApplicability: Victa Airtourer 100 and 115. Document:  1. Victa Mod. B47; or\n\n2. Victa SB No. 25. Compliance: Before 1 September 1971.\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":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive focused specifically on stall warning installation for two aircraft models. It has not expanded beyond its original narrow technical scope."},"complexity_factors":["Extremely short document (approximately 100 words of substantive content)","Only 2 defined applicability criteria (specific aircraft models)","Simple binary compliance pathway (two alternative documents referenced)","Single absolute deadline with no conditional extensions or exceptions","No nested definitions, cross-references to other legislation, or conditional logic","Straightforward command structure: applicability → requirement → deadline"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it requires:** Owners and operators of specific light aircraft (the **Victa Airtourer 100 and 115**) must install a **stall warning indicator** — a device that alerts pilots when the plane is approaching a stall (flying too slowly, risking loss of control).\n\n**How to comply:** Aircraft owners must follow one of two approved methods:\n- **Victa Modification B47** (an official design change by the manufacturer), OR\n- **Victa Service Bulletin No. 25** (official maintenance instructions from the manufacturer)\n\n**Deadline:** The work had to be completed **before 1 September 1971**.\n\n**Why it matters:** Stalls are a leading cause of fatal aviation accidents. This directive ensures pilots receive audible or visual warning before the aircraft reaches dangerous low-speed flight conditions, giving them time to recover safely.\n\n**Who it affects:** Anyone operating or maintaining these specific Victa Airtourer aircraft models in Australia."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive text is a single, focused requirement: install a stall warning indicator on Victa Airtourer 100 and 115 using Victa Mod. B47 or Victa SB No. 25 by the specified date. There is no information in the supplied text indicating a change in scope from this stated requirement."},"complexity_factors":["Very narrow applicability: only Victa Airtourer 100 and 115 (Applicability).","Single prescriptive compliance action with two specified documents (Document).","Fixed compliance deadline (before 1 September 1971) keeps timing simple (Compliance).","Absence of technical detail or alternative compliance paths in the text increases reliance on external documents (Document).","Regulatory enforcement context is referenced but not detailed (header: Part 39, Schedule of Airworthiness Directives)."],"plain_english_summary":"This airworthiness directive requires owners/operators of Victa Airtourer 100 and 115 aeroplanes to install a stall‑warning indicator using either Victa Modification B47 or Victa Service Bulletin No. 25 by 1 September 1971. Owners/operators pay for and arrange the work; maintenance organisations or certificated engineers carry it out. The requirement is issued under the Civil Aviation safety regulatory framework (Part 39, Schedule of Airworthiness Directives)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-vat-13-stall-warning-indicator-installation","history":"/api/acts/ad-vat-13-stall-warning-indicator-installation/history","analysis":"/api/acts/ad-vat-13-stall-warning-indicator-installation/analysis","conflicts":"/api/acts/ad-vat-13-stall-warning-indicator-installation/conflicts","importantCases":"/api/acts/ad-vat-13-stall-warning-indicator-installation/important-cases","documents":"/api/acts/ad-vat-13-stall-warning-indicator-installation/documents"}}