{"id":"F2009L03921","name":"AD/BELL 412/35 - Tail Boom Doubler and Fin Spar Caps - CANCELLED","slug":"ad-bell-412-35-tail-boom-doubler-and-fin-spar-caps-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":81302,"registerId":"commonwealth-F2009L03921-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron 412 Series Helic","sectionType":"division","heading":"Bell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 412/35 | Tail Boom Doubler and Fin Spar Caps | 12/2009 |\n| -------------- | ----------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                |\n| ------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 19 November 2009.                                                                                                                                                 |\n| Background:  | This unique Australian AD specified periodic inspections in accordance with Alert SB 412-93-74 until terminating action which was required by January 1996. The 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 412/35","sectionType":"part","heading":"AD/BELL 412/35","content":"## AD/BELL 412/35","sortOrder":1},{"sectionNumber":"Tail Boom Doubler and Fin Spar Caps","sectionType":"part","heading":"Tail Boom Doubler and Fin Spar Caps","content":"## Tail Boom Doubler and Fin Spar Caps","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":1877},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument performs exactly the function indicated by its title and header: it cancels the previous airworthiness directive. The scope has not expanded beyond this straightforward administrative removal of requirements."},"complexity_factors":["Single administrative action (cancellation only)","No operative provisions creating obligations","No defined terms or interpretation section","No conditional logic, exceptions, or cross-references to other legislation","Extremely brief (under 100 words of substantive content)"],"plain_english_summary":"**What this is:** This document officially cancels a previous airworthiness directive (safety rule) for Bell 412 helicopters.\n\n**Who it affects:** Owners and operators of Bell Helicopter Textron 412 series helicopters.\n\n**What it does:**\n- **Removes inspection requirements:** It cancels the previous rule (AD/BELL 412/35) that required regular inspections of the **tail boom doubler** and **fin spar caps** (structural parts of the helicopter's tail section).\n- **Why now:** The original rule required these inspections only until a permanent fix ('terminating action') was completed. That deadline was January 1996—over a decade ago—so the inspection requirement is no longer necessary.\n\n**In short:** If you fly or own a Bell 412 helicopter, you no longer need to follow the specific inspection schedule outlined in the old Alert Service Bulletin 412-93-74 for these parts."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-412-35-tail-boom-doubler-and-fin-spar-caps-cancelled","history":"/api/acts/ad-bell-412-35-tail-boom-doubler-and-fin-spar-caps-cancelled/history","analysis":"/api/acts/ad-bell-412-35-tail-boom-doubler-and-fin-spar-caps-cancelled/analysis","conflicts":"/api/acts/ad-bell-412-35-tail-boom-doubler-and-fin-spar-caps-cancelled/conflicts","importantCases":"/api/acts/ad-bell-412-35-tail-boom-doubler-and-fin-spar-caps-cancelled/important-cases","documents":"/api/acts/ad-bell-412-35-tail-boom-doubler-and-fin-spar-caps-cancelled/documents"}}