{"id":"F2007L03994","name":"AD/RES/34 - Horizontal Net SRFW HN1","slug":"ad-res-34-horizontal-net-srfw-hn1","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":160788,"registerId":"commonwealth-F2007L03994-current","compilationNumber":null,"startDate":"2026-04-04","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Restraint Equipment","sectionType":"division","heading":"Restraint Equipment","content":"### Restraint Equipment\n\n| AD/RES/34 | Horizontal Net SRFW HN1 | 11/2007 |\n| --------- | ----------------------- | ------- |\n\n| Applicability: | Swiss Air-Ambulance Ltd (formerly SRFW) Horizontal Net SRFW HN1. These nets can be used as rescue equipment in various helicopter types.                                                                                                                                                                                                         |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Further use in flight operations of the affected nets is prohibited, and the equipment must be removed from service.Note: Switzerland FOCA AD HB-2007-295 refers.                                                                                                                                                                                |\n| Compliance:    | Within 30 days after 25 October 2007.                                                                                                                                                                                                                                                                                                            |\n|                | This Airworthiness Directive becomes effective on 25 October 2007.                                                                                                                                                                                                                                                                               |\n| Background:    | The original raw material for the production of the affected horizontal nets is no longer available. In 1990 the manufacturer changed to an alternative raw material in the production process. The material strength of the alternative raw material is unknown and is therefore considered as not approved and must be withdrawn from service. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n13 September 2007","sortOrder":0},{"sectionNumber":"AD/RES/34","sectionType":"part","heading":"AD/RES/34","content":"## AD/RES/34","sortOrder":1},{"sectionNumber":"Horizontal Net SRFW HN1","sectionType":"part","heading":"Horizontal Net SRFW HN1","content":"## Horizontal Net SRFW HN1","sortOrder":2},{"sectionNumber":"11/2007","sectionType":"part","heading":"11/2007","content":"## 11/2007","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The instrument withdraws prior approval for continued use of the affected nets and narrows scope from permitted use to mandatory removal within 30 days, driven by a 1990 raw‑material change now judged not approved (Background; Requirement; Compliance)."},"complexity_factors":["Narrow applicability: applies to a single net model and identified operator (Applicability).","Clear mandated action: prohibition of in‑flight use and removal from service (Requirement).","Short, specific compliance deadline and effective date (Compliance).","Technical reason is limited to unknown material strength after a production change (Background).","Operational impact concentrated on affected operators who must bear replacement/removal costs.","Low regulatory discretion: mandatory withdrawal rather than corrective/conditional measures."],"plain_english_summary":"This airworthiness directive forbids in‑flight use of the Swiss Air‑Ambulance Horizontal Net SRFW HN1 and requires those nets to be removed from service. It takes effect 25 October 2007 with mandatory compliance within 30 days (Requirement; Compliance). Owners and operators must stop using and remove the nets at their own cost; the Civil Aviation Safety Authority issued the order because the nets contain an alternative raw material of unknown strength (Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific piece of equipment with a known material defect. The scope remains precisely limited to the SRFW HN1 horizontal nets and has not expanded beyond this original purpose."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only one defined term implied (the equipment model 'SRFW HN1')","No cross-references to other legislation or regulations","Single, unambiguous requirement with clear deadline","No conditional logic or exceptions","Straightforward cause-and-effect: unknown material strength → prohibition"],"plain_english_summary":"This CASA Airworthiness Directive immediately prohibits use of the Horizontal Net SRFW HN1 rescue nets (made by Swiss Air‑Ambulance Ltd/SRFW) in Australian helicopter hoist rescues.  \n\nCASA took this action because the manufacturer changed net material in 1990 and the strength of the replacement is unknown—posing a possible fatal failure risk—so operators must remove the nets from service within 30 days (effective 25 Oct 2007)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-res-34-horizontal-net-srfw-hn1","history":"/api/acts/ad-res-34-horizontal-net-srfw-hn1/history","analysis":"/api/acts/ad-res-34-horizontal-net-srfw-hn1/analysis","conflicts":"/api/acts/ad-res-34-horizontal-net-srfw-hn1/conflicts","importantCases":"/api/acts/ad-res-34-horizontal-net-srfw-hn1/important-cases","documents":"/api/acts/ad-res-34-horizontal-net-srfw-hn1/documents"}}