{"id":"F2009L03125","name":"AD/ROTAX/12 - Oil System Venting - CANCELLED","slug":"ad-rotax-12-oil-system-venting-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":80851,"registerId":"commonwealth-F2009L03125-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Rotax Piston Engines","sectionType":"division","heading":"Rotax Piston Engines","content":"### Rotax Piston Engines\n\n| AD/ROTAX/12 | Oil System Venting | 9/2009 |\n| ----------- | ------------------ | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                       |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n|              | This AD is cancelled on 27 August 2009.                                                                                                                                                                                                          |\n| Background:  | Further investigation by the manufacturer has determined that the actions detailed in this AD were not the root cause of engine in this case as previously determined.The actions detailed in AD/ROTAX/19 supersede the requirements of this AD. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n17 July 2009","sortOrder":0},{"sectionNumber":"AD/ROTAX/12","sectionType":"part","heading":"AD/ROTAX/12","content":"## AD/ROTAX/12","sortOrder":1},{"sectionNumber":"Oil System Venting","sectionType":"part","heading":"Oil System Venting","content":"## Oil System Venting","sortOrder":2},{"sectionNumber":"9/2009","sectionType":"part","heading":"9/2009","content":"## 9/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2037},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":true,"description":"Originally, this instrument imposed mandatory maintenance requirements on aircraft engine oil systems. This version completely nullifies those requirements, reducing the regulatory scope from active safety mandates to zero obligations. The legislative effect has inverted from imposing duties to removing them."},"complexity_factors":["Document is purely administrative - a cancellation notice with no operative obligations","Zero defined terms or interpretation provisions","No conditional logic, exceptions, or procedural steps","Single cross-reference to superseding instrument (AD/ROTAX/19)","Extremely brief - approximately 50 words of substantive legislative effect"],"plain_english_summary":"**What this is:** This document cancels a previous safety rule (Airworthiness Directive AD/ROTAX/12) that required owners of Rotax piston aircraft engines to perform specific maintenance actions on their oil system venting.\n\n**Who it affects:** Aircraft owners and operators with Rotax piston engines who were previously required to follow the original AD/ROTAX/12.\n\n**What it does:**\n- **Removes the requirement:** You no longer need to perform the oil system venting inspections or modifications that were previously mandatory.\n- **Why it changed:** The engine manufacturer conducted further investigation and discovered the oil venting system wasn't actually the root cause of the engine problems. The original safety fix was targeting the wrong issue.\n- **What to do instead:** A different safety directive (**AD/ROTAX/19**) now contains the correct requirements to address the actual problem.\n\n**Bottom line:** If you were complying with the old rule about oil system venting, you can stop. Follow AD/ROTAX/19 instead."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rotax-12-oil-system-venting-cancelled","history":"/api/acts/ad-rotax-12-oil-system-venting-cancelled/history","analysis":"/api/acts/ad-rotax-12-oil-system-venting-cancelled/analysis","conflicts":"/api/acts/ad-rotax-12-oil-system-venting-cancelled/conflicts","importantCases":"/api/acts/ad-rotax-12-oil-system-venting-cancelled/important-cases","documents":"/api/acts/ad-rotax-12-oil-system-venting-cancelled/documents"}}