{"id":"F2009L03035","name":"AD/HILLER 12/6 - Superseded by AD/HILLER 12/11 - CANCELLED","slug":"ad-hiller-12-6-superseded-by-ad-hiller-12-11-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":80606,"registerId":"commonwealth-F2009L03035-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Hiller UH-12 Series Helicopters","sectionType":"division","heading":"Hiller UH-12 Series Helicopters","content":"### Hiller UH-12 Series Helicopters\n\n| AD/HILLER 12/6 | Superseded by AD/HILLER 12/11 | 9/2009 |\n| -------------- | ----------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                 |\n| ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 27 August 2009.                                                                                                                                    |\n| Background:  | This AD was raised in 1963 then subsequently superseded by AD/HILLER 12/11. AD/HILLER 12/11 was cancelled in 1987. This AD is therefore cancelled as it serves no purpose. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n15 July 2009","sortOrder":0},{"sectionNumber":"AD/HILLER 12/6","sectionType":"part","heading":"AD/HILLER 12/6","content":"## AD/HILLER 12/6","sortOrder":1},{"sectionNumber":"Superseded by AD/HILLER 12/11","sectionType":"part","heading":"Superseded by AD/HILLER 12/11","content":"## Superseded by AD/HILLER 12/11","sortOrder":2},{"sectionNumber":"9/2009","sectionType":"part","heading":"9/2009","content":"##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":2216},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument performs a narrow administrative function: formally terminating an obsolete 1963 airworthiness directive. The scope is limited to this specific housekeeping action and has not expanded beyond cleaning up the civil aviation regulatory framework."},"complexity_factors":["Single operative clause (cancellation with effective date)","Zero defined terms","No substantive requirements or prohibitions","Minimal cross-referencing (refers only to the superseding directive)","Document length is approximately 100 words of operative content"],"plain_english_summary":"**What this is**\n\nThis document formally cancels a 46-year-old aviation safety rule about Hiller UH-12 helicopters.\n\n**The backstory**\n- The original safety directive (**AD/HILLER 12/6**) was issued in 1963 to mandate specific maintenance or inspections for these helicopters\n- It was replaced by a newer directive (**AD/HILLER 12/11**) in 1987\n- That replacement was itself cancelled in 1987, leaving the original 1963 directive technically \"superseded\" but not formally \"cancelled\" on the books\n\n**What this document does**\nIt tidies up the regulatory records by formally cancelling the 1963 directive, effective **27 August 2009**.\n\n**Who cares?**\nOwners and operators of Hiller UH-12 helicopters. In practice, this change has **no operational impact** — the 1963 rules haven't applied for decades. This is purely administrative housekeeping to keep the aviation safety register accurate and prevent confusion."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hiller-12-6-superseded-by-ad-hiller-12-11-cancelled","history":"/api/acts/ad-hiller-12-6-superseded-by-ad-hiller-12-11-cancelled/history","analysis":"/api/acts/ad-hiller-12-6-superseded-by-ad-hiller-12-11-cancelled/analysis","conflicts":"/api/acts/ad-hiller-12-6-superseded-by-ad-hiller-12-11-cancelled/conflicts","importantCases":"/api/acts/ad-hiller-12-6-superseded-by-ad-hiller-12-11-cancelled/important-cases","documents":"/api/acts/ad-hiller-12-6-superseded-by-ad-hiller-12-11-cancelled/documents"}}