{"id":"F2009L01849","name":"AD/B-2/9 - Main Transmission Mount - Reinforcement - CANCELLED","slug":"ad-b-2-9-main-transmission-mount-reinforcement-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78864,"registerId":"commonwealth-F2009L01849-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Brantly B-2 Series Helicopters","sectionType":"division","heading":"Brantly B-2 Series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-2/9 | Main Transmission Mount - 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 main transmission mount in accordance with Brantly SB No. 5 to reinforce the mounts. 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-2/9","sectionType":"part","heading":"AD/B-2/9","content":"## AD/B-2/9","sortOrder":1},{"sectionNumber":"Main Transmission Mount - Reinforcement","sectionType":"part","heading":"Main Transmission Mount - Reinforcement","content":"## Main Transmission Mount - 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":2887},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":true,"description":"The instrument has transitioned from imposing mandatory airworthiness modifications (the original 1960 version) to complete cancellation (the 2009 version), thereby removing all compliance obligations and regulatory scope."},"complexity_factors":["Single operative provision (cancellation)","No defined terms or interpretation section","No conditional logic, exceptions, or cross-references to other legislation","Document consists only of a status declaration and brief historical background"],"plain_english_summary":"**What this document does**\n\nThis is an **Airworthiness Directive (AD)** — a legally binding safety rule issued by the Civil Aviation Safety Authority (CASA) for aircraft. Specifically, this document **cancels an old safety rule** (originally issued in 1960) that required owners of Brantly B-2 helicopters to reinforce the main transmission mount (the structure that holds the engine and rotor to the airframe).\n\n**Who it affects**\n- Owners and operators of Brantly B-2 series helicopters.\n- In practice, this removes a regulatory burden because the modification requirement no longer applies.\n\n**Why it matters**\nThe original rule required immediate modification of the transmission mounts per Brantly Service Bulletin No. 5. Because the rule was issued in 1960 and compliance was mandatory, CASA assumes every affected helicopter has already been modified. This document formally removes the obsolete requirement, effective 4 June 2009."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b-2-9-main-transmission-mount-reinforcement-cancelled","history":"/api/acts/ad-b-2-9-main-transmission-mount-reinforcement-cancelled/history","analysis":"/api/acts/ad-b-2-9-main-transmission-mount-reinforcement-cancelled/analysis","conflicts":"/api/acts/ad-b-2-9-main-transmission-mount-reinforcement-cancelled/conflicts","importantCases":"/api/acts/ad-b-2-9-main-transmission-mount-reinforcement-cancelled/important-cases","documents":"/api/acts/ad-b-2-9-main-transmission-mount-reinforcement-cancelled/documents"}}