{"id":"F2009L01847","name":"AD/B-2/11 - Tail Rotor Blade Retaining Nut - Safetying - CANCELLED","slug":"ad-b-2-11-tail-rotor-blade-retaining-nut-safetying-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78859,"registerId":"commonwealth-F2009L01847-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Brantly B-2 Series Helicopters","sectionType":"division","heading":"Brantly B-2 Series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-2/11 | Tail Rotor Blade Retaining Nut - Safetying | 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 rotor blade retaining nuts in accordance with Brantly SL No. 12 to install safety wire to the nuts. 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-2/11","sectionType":"part","heading":"AD/B-2/11","content":"## AD/B-2/11","sortOrder":1},{"sectionNumber":"Tail Rotor Blade Retaining Nut - Safetyi","sectionType":"part","heading":"Tail Rotor Blade Retaining Nut - Safetying","content":"## Tail Rotor Blade Retaining Nut - Safetying","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":1270},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument simply terminates the scope of a previous directive. It does not expand, restrict, or alter the substantive regulatory framework."},"complexity_factors":["Single operative provision (cancellation)","No defined terms or interpretation section","No conditional logic or exceptions","Straightforward revocation without replacement provisions","Minimal cross-referencing (only refers to the cancelled AD and Brantly Service Letter No. 12 for historical context)"],"plain_english_summary":"**What this does:** This document officially cancels a 49-year-old aviation safety rule that required owners of Brantly B-2 series helicopters to install safety wire on tail rotor blade retaining nuts.\n\n**Background:** The original rule (issued in 1960) mandated a modification to prevent the tail rotor nuts from coming loose. Because this change would have been made to all affected helicopters decades ago, the rule is now redundant.\n\n**Impact:** This removes an outdated compliance requirement. No action is required by aircraft owners—the cancellation simply recognises that the safety modification has already been universally adopted."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b-2-11-tail-rotor-blade-retaining-nut-safetying-cancelled","history":"/api/acts/ad-b-2-11-tail-rotor-blade-retaining-nut-safetying-cancelled/history","analysis":"/api/acts/ad-b-2-11-tail-rotor-blade-retaining-nut-safetying-cancelled/analysis","conflicts":"/api/acts/ad-b-2-11-tail-rotor-blade-retaining-nut-safetying-cancelled/conflicts","importantCases":"/api/acts/ad-b-2-11-tail-rotor-blade-retaining-nut-safetying-cancelled/important-cases","documents":"/api/acts/ad-b-2-11-tail-rotor-blade-retaining-nut-safetying-cancelled/documents"}}