{"id":"F2006B07603","name":"AD/WILGA/2 - Stall Warning System","slug":"ad-wilga-2-stall-warning-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50285,"registerId":"commonwealth-F2006B07603-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/WILGA/2 - Stall Warning System","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)  PZL 104 (Wilga) Series Aeroplanes\n\n \n\nAD/WILGA/2 Stall Warning System 2/95\n\nApplicability: All PZL-104 `Wilga 80’ aircraft.\n\n \n\nRequirement: Install a guard on the Stall Warning System automatic switch in accordance with PZL-Warszawa-Okecie Mandatory Service Bulletin 10493023.\n\n \n\nNote: This Service Bulletin has been classified as Mandatory by the General Inspectorate of Civil Aviation Poland.\n\n \n\nCompliance: Prior to 1 August 1995.\n\n \n\nBackground: This Directive introduces measures whereby the Stall Warning System cannot be inadvertently switched off, preventing the operation of the acoustic warning horn.\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":"This is a discrete, time-limited safety directive with a narrow, specific purpose. It has not expanded beyond its original intent of mandating a single physical modification to prevent inadvertent deactivation of the stall warning system."},"complexity_factors":["Single, unambiguous requirement (install one specific guard)","No defined terms section","No cross-references to other legislation (only references a technical service bulletin)","No conditional logic or exceptions","Extremely short (approximately 150 words of substantive content)","Clear applicability (single aircraft model) and single compliance deadline"],"plain_english_summary":"This is an **Airworthiness Directive** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\n- Requires owners/operators of **PZL-104 'Wilga 80' aircraft** (a Polish-made utility plane) to install a **physical guard** over the automatic switch for the Stall Warning System.\n- A \"stall warning system\" is equipment that alerts pilots when the aircraft is at risk of stalling (losing lift and potentially crashing). The \"guard\" is a protective cover that prevents someone from accidentally flipping the switch off.\n\n**Why it matters:**\n- The background explains that without this guard, the stall warning system could be **inadvertently switched off**, meaning the loud warning horn wouldn't work when needed. This creates a serious safety risk — pilots might not realise they're approaching a stall until it's too late.\n- The directive references a **Mandatory Service Bulletin** from the Polish aviation authority, showing this was a known design flaw requiring urgent correction.\n\n**Who must comply:**\n- Anyone operating a Wilga 80 aircraft in Australia had to complete this modification **before 1 August 1995**.\n\n**In short:** This is a targeted safety fix — a one-page order requiring a simple physical modification to prevent a potentially fatal cockpit error."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive appears to maintain a narrow, original scope: it applies to all PZL-104 \"Wilga 80\" aircraft and requires installation of a guard on the Stall Warning System automatic switch in accordance with the referenced Mandatory Service Bulletin, with a specified compliance date. The source contains no indication that the scope has been expanded or altered from that expressed in the directive."},"complexity_factors":["Single, specific technical requirement (install a guard on a single switch) (Requirement)","Narrow applicability limited to one aircraft model/series (Applicability)","Compliance depends on an external document (Mandatory Service Bulletin) for technical steps (Requirement; Note)","Fixed and past compliance deadline (Compliance)","Operational dependencies: parts, tooling and qualified maintenance personnel required (Requirement)"],"plain_english_summary":"The directive legally requires owners/operators and maintenance organisations of PZL‑104 Wilga 80 aircraft to fit a physical guard over the Stall Warning System’s automatic switch, installed as specified in the manufacturer’s Mandatory Service Bulletin, before 1 August 1995. It aims to prevent inadvertent shut‑off of the stall warning horn; owners/operators (or their contractors) bear parts, labour and downtime costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-wilga-2-stall-warning-system","history":"/api/acts/ad-wilga-2-stall-warning-system/history","analysis":"/api/acts/ad-wilga-2-stall-warning-system/analysis","conflicts":"/api/acts/ad-wilga-2-stall-warning-system/conflicts","importantCases":"/api/acts/ad-wilga-2-stall-warning-system/important-cases","documents":"/api/acts/ad-wilga-2-stall-warning-system/documents"}}