{"id":"F2008L01038","name":"AD/BELL 412/54 - Rescue Hoist Hook","slug":"ad-bell-412-54-rescue-hoist-hook","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":73176,"registerId":"commonwealth-F2008L01038-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron 412 Series Helic","sectionType":"division","heading":"Bell Helicopter Textron 412 Series Helicopters","content":"### Bell Helicopter Textron 412 Series Helicopters\n\n| AD/BELL 412/54 | Rescue Hoist Hook | 6/2008 DM |\n| -------------- | ----------------- | --------- |\n\n| Applicability: | All Model AB412 and AB412EP helicopters with rescue hoist part numberBL-10300-60 or part number 412-8800-01-315 installed, and equipped respectively with hook part number S6150-61090-1 or part number 412-8800-05-101; and affected hooks held as spares.               |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Inspect in accordance with the instructions of Agusta Alert Technical Bulletin No. 412-124.2. Hooks stored as spare parts must be inspected in accordance with the instructions of Agusta Alert Technical Bulletin No. 412-124.Note: ENAC Emergency AD 2008-62 refers. |\n| Compliance:    | For Requirement 1. - Before the next flight of the helicopter after 10 April 2008, unless already accomplished; or before installation of the affected hoists/hooks on the helicopter.For Requirement 2. - Before 30 April 2008, unless already accomplished.             |\n|                | This Airworthiness Directive becomes effective on 10 April 2008.                                                                                                                                                                                                          |\n| Background:    | The ENAC received a report of a part number 412-8800-05-101 hook without the part number BL-1358 lock pin installed. This condition, unless corrected, could allow the retaining nut to completely unthread and release the hook.                                         |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n8 April 2008","sortOrder":0},{"sectionNumber":"AD/BELL 412/54","sectionType":"part","heading":"AD/BELL 412/54","content":"## AD/BELL 412/54","sortOrder":1},{"sectionNumber":"Rescue Hoist Hook","sectionType":"part","heading":"Rescue Hoist Hook","content":"## Rescue Hoist Hook","sortOrder":2},{"sectionNumber":"6/2008 DM","sectionType":"part","heading":"6/2008 DM","content":"## 6/2008 DM","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific mechanical defect in specific helicopter models. There is no evidence of scope creep; it targets exactly the safety issue identified in the background (missing lock pin on specific hook assemblies)."},"complexity_factors":["Single, specific technical requirement (visual inspection per referenced bulletin)","Only 2 defined part numbers for hoists and 2 for hooks, plus 1 lock pin reference","Two simple compliance deadlines with straightforward exceptions ('unless already accomplished')","No nested conditions or cross-references to other legislation beyond one referenced technical bulletin","Background explanation is concise and directly explains the safety risk","Total length is extremely short (under 300 words of substantive content)"],"plain_english_summary":"This AD mandates urgent inspections of rescue hoist hooks on certain Bell AB412/AB412EP helicopters (and spare hooks in inventory) to verify the safety lock pin (BL-1358) is fitted. A missing pin can allow the retaining nut to back off and the hook to detach during a rescue.\n\nIt affects operators and parts-holders; inspections must be done before next flight after 10 April 2008 for in-service helicopters and by 30 April 2008 for spares."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive confines its scope to the specified hoist and hook part numbers (including spares) and mandates inspections per the referenced bulletin. It does not broaden applicability to other models or components and therefore does not change the original targeted scope described in the instrument (Applicability; Requirement)."},"complexity_factors":["Narrow applicability — only AB412/AB412EP with specified hoist/hook part numbers and affected spares (Applicability)","Single remedial action — inspection per a named technical bulletin, not a multi-step modification (Requirement)","Short, mandatory compliance deadlines with immediate operational effect (Compliance)","Dependence on external technical document (Agusta Alert Technical Bulletin No. 412-124.2) for inspection instructions (Requirement)","Clear, safety-driven trigger documented (missing lock pin could allow nut to unthread) (Background)","Low regulatory discretion — directive prescribes when inspections must occur rather than leaving timing to operators (Compliance)"],"plain_english_summary":"This directive requires owners/operators of Bell AB412 and AB412EP helicopters fitted with the listed rescue hoists or hooks — and those holding the affected hooks as spares — to inspect those hooks following Agusta Alert Technical Bulletin No. 412-124.2. Inspections must be done before the next flight after 10 April 2008 or before installing the parts; spares have a later deadline. The action responds to a reported missing lock pin that could allow a hook to release (Requirement; Compliance; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-412-54-rescue-hoist-hook","history":"/api/acts/ad-bell-412-54-rescue-hoist-hook/history","analysis":"/api/acts/ad-bell-412-54-rescue-hoist-hook/analysis","conflicts":"/api/acts/ad-bell-412-54-rescue-hoist-hook/conflicts","importantCases":"/api/acts/ad-bell-412-54-rescue-hoist-hook/important-cases","documents":"/api/acts/ad-bell-412-54-rescue-hoist-hook/documents"}}