{"id":"F2006B08539","name":"AD/CHA/13 - Stall Warning Horn","slug":"ad-cha-13-stall-warning-horn","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51315,"registerId":"commonwealth-F2006B08539-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CHA/13 - Stall Warning Horn","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)  American Champion (Aeronca, Bellanca) Series Aeroplanes\n\n \n\nAD/CHA/13 Stall Warning Horn 8/75\n\nApplicability: Models 7EC, 7FC, 7ECA, 7GCAA, 7GCBC and 7KCAB. Requirement:  Install an approved stall warning horn system.\n\nThe following Bellanca-Champion drawings detail approved systems:\n\n \n\nDwg. No. 7-1065 for models 7EC and 7FC; OR Dwg. No. 7-1401 for models 7ECA, 7GCAA, 7GCBC and 7KCAB.\n\n \n\nCompliance: Before 31 January 1976.\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 solely on stall warning horn installation. It has not expanded beyond its original narrow technical purpose."},"complexity_factors":["Extremely short document (under 150 words)","Only 6 defined aircraft models in applicability clause","Simple binary compliance requirement (install system or don't)","No nested exceptions, conditional logic, or cross-references to other legislation","Single deadline with no alternative compliance methods or phased implementation","No interpretation section or defined terms"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority. It requires owners of specific American Champion aeroplane models to install a stall warning horn system.\n\n**What it does:**\n- **Mandates installation** of an approved stall warning horn on six specific aircraft models (7EC, 7FC, 7ECA, 7GCAA, 7GCBC, and 7KCAB)\n- **Specifies approved designs** through two technical drawings (7-1065 for older models, 7-1401 for newer ones)\n- **Sets a hard deadline** — compliance was required before 31 January 1976\n\n**Who it affects:**\n- Owners and operators of these specific American Champion (formerly Aeronca/Bellanca) aircraft\n- Maintenance organisations servicing these planes\n\n**Why it matters:**\nA stall warning horn alerts pilots when the aircraft is approaching an aerodynamic stall — a dangerous condition where the wings lose lift. Without this warning, pilots risk unintentional stalls, particularly during landing approaches. This directive prevents accidents by ensuring pilots receive audible warning before it's too late to recover."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The source text presents a narrowly prescriptive requirement for specific aircraft models with specified approved installations and a set compliance date. There is no text indicating any change to that scope within this instrument; it specifies the targeted models, the approved drawing numbers for each model group, and a compliance deadline. No amendments, broadenings, or exclusions are stated in the provided material."},"complexity_factors":["Narrow applicability: limited to six specific aircraft models (\"Applicability\").","Single, discrete technical requirement: install an approved stall warning horn system (\"Requirement\").","Prescriptive technical standard: approval limited to two specified drawing numbers rather than open-ended performance criteria (\"The following Bellanca-Champion drawings\").","Fixed compliance deadline imposes a clear timing constraint (\"Compliance\").","Lack of procedural detail in the text about enforcement, penalties, or alternative approval routes increases practical uncertainty despite the directive's brevity (entire text).","Cross-reference to issuing authority and regulatory context in header (Civil Aviation Safety Authority, Schedule of Airworthiness Directives) introduces administrative provenance but no procedural elaboration (Header)."],"plain_english_summary":"The Civil Aviation Safety Authority requires owners/operators and maintainers of specific American Champion (Aeronca/Bellanca) models (7EC, 7FC, 7ECA, 7GCAA, 7GCBC, 7KCAB) to install an approved stall‑warning horn system, as detailed by Bellanca‑Champion drawings Dwg. No. 7‑1065 (7EC/7FC) or Dwg. No. 7‑1401 (other models).\n\nCompliance was required before 31 January 1976; owners bear installation costs and are limited to the approved designs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cha-13-stall-warning-horn","history":"/api/acts/ad-cha-13-stall-warning-horn/history","analysis":"/api/acts/ad-cha-13-stall-warning-horn/analysis","conflicts":"/api/acts/ad-cha-13-stall-warning-horn/conflicts","importantCases":"/api/acts/ad-cha-13-stall-warning-horn/important-cases","documents":"/api/acts/ad-cha-13-stall-warning-horn/documents"}}