{"id":"F2009L01851","name":"AD/B-2/5 - Tail Cone Reinforcement - CANCELLED","slug":"ad-b-2-5-tail-cone-reinforcement-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78868,"registerId":"commonwealth-F2009L01851-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Brantly B-2 Series Helicopters","sectionType":"division","heading":"Brantly B-2 Series Helicopters","content":"### Brantly B-2 Series Helicopters\n\n| AD/B-2/5 | Tail Cone Reinforcement | 6/2009 |\n| -------- | ----------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                               |\n| ------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 4 June 2009.                                                                                                                                                                                                     |\n| Background:  | This AD, issued in 1960, required modification of the tail cone in accordance with Brantly SB No. 5 to reinforce the structure. The AD compliance was forthwith. As all aircraft would have been modified, the AD is no longer required. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n17 April 2009","sortOrder":0},{"sectionNumber":"AD/B-2/5","sectionType":"part","heading":"AD/B-2/5","content":"## AD/B-2/5","sortOrder":1},{"sectionNumber":"Tail Cone Reinforcement","sectionType":"part","heading":"Tail Cone Reinforcement","content":"## Tail Cone Reinforcement","sortOrder":2},{"sectionNumber":"6/2009","sectionType":"part","heading":"6/2009","content":"## 6/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1257},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The instrument performs a straightforward cancellation of a specific Airworthiness Directive without expanding, narrowing, or altering the regulatory scope. It simply removes a spent requirement."},"complexity_factors":["Single operative provision (cancellation only)","No defined terms or interpretation section","No cross-references to other legislation","No conditional or contingent provisions"],"plain_english_summary":"This document **cancels an old aircraft safety rule** (called an Airworthiness Directive) for Brantly B-2 series helicopters.\n\n**What the old rule required**\nBack in 1960, regulators issued a directive requiring owners to reinforce the tail cone (the rear structural section) of these helicopters. This was a mandatory fix to strengthen the airframe in accordance with manufacturer Service Bulletin No. 5.\n\n**Why it is being cancelled**\nThe original rule required immediate compliance. Because nearly 50 years have passed, aviation authorities assume every affected helicopter has already been modified. Since no unmodified aircraft are believed to remain in service, the rule is redundant.\n\n**What this means**\nAs of 4 June 2009, aircraft owners and maintenance engineers no longer need to track or prove compliance with this specific tail cone modification. The requirement has been removed from the aviation safety rules."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b-2-5-tail-cone-reinforcement-cancelled","history":"/api/acts/ad-b-2-5-tail-cone-reinforcement-cancelled/history","analysis":"/api/acts/ad-b-2-5-tail-cone-reinforcement-cancelled/analysis","conflicts":"/api/acts/ad-b-2-5-tail-cone-reinforcement-cancelled/conflicts","importantCases":"/api/acts/ad-b-2-5-tail-cone-reinforcement-cancelled/important-cases","documents":"/api/acts/ad-b-2-5-tail-cone-reinforcement-cancelled/documents"}}