{"id":"F2009L03924","name":"AD/BELL 412/25 - Main Rotor Flight Control System Bolts - CANCELLED","slug":"ad-bell-412-25-main-rotor-flight-control-system-bolts-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":81309,"registerId":"commonwealth-F2009L03924-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron 412 Series Helic","sectionType":"division","heading":"Bell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 412/25 | Main Rotor Flight Control System Bolts | 12/2009 |\n| -------------- | -------------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                               |\n| ------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 19 November 2009.                                                                                                                                                |\n| Background:  | This unique Australian AD specified inspection in accordance with ASB 412-89-45 at intervals not exceeding 24 months. The absence of SD Reports indicates this AD is no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n30 September 2009","sortOrder":0},{"sectionNumber":"AD/BELL 412/25","sectionType":"part","heading":"AD/BELL 412/25","content":"## AD/BELL 412/25","sortOrder":1},{"sectionNumber":"Main Rotor Flight Control System Bolts","sectionType":"part","heading":"Main Rotor Flight Control System Bolts","content":"## Main Rotor Flight Control System Bolts","sortOrder":2},{"sectionNumber":"12/2009","sectionType":"part","heading":"12/2009","content":"## 12/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1483},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument was created specifically to cancel the previous Airworthiness Directive and performs exactly that limited function without expanding beyond its original purpose."},"complexity_factors":["Single operational statement (cancellation only)","No defined terms or conditional logic","No exceptions or nested requirements","Minimal cross-referencing (only cites the superseded directive)"],"plain_english_summary":"**What this does:** This document officially cancels a previous safety rule (Airworthiness Directive AD/BELL 412/25) that required owners of Bell 412 helicopters to inspect bolts in the main rotor flight control system every 24 months.\n\n**Who it affects:** Operators and owners of Bell Helicopter Textron 412 series helicopters.\n\n**What it means for you:** If you own or operate one of these helicopters, you **no longer need to perform these specific bolt inspections**. The Civil Aviation Safety Authority has removed this requirement because there have been no reports of safety problems related to these bolts, meaning the mandatory inspections are no longer considered necessary.\n\n**Key date:** The cancellation took effect on **19 November 2009**."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-412-25-main-rotor-flight-control-system-bolts-cancelled","history":"/api/acts/ad-bell-412-25-main-rotor-flight-control-system-bolts-cancelled/history","analysis":"/api/acts/ad-bell-412-25-main-rotor-flight-control-system-bolts-cancelled/analysis","conflicts":"/api/acts/ad-bell-412-25-main-rotor-flight-control-system-bolts-cancelled/conflicts","importantCases":"/api/acts/ad-bell-412-25-main-rotor-flight-control-system-bolts-cancelled/important-cases","documents":"/api/acts/ad-bell-412-25-main-rotor-flight-control-system-bolts-cancelled/documents"}}