{"id":"F2008L00169","name":"AD/CESSNA 185/15 - Control Systems - CANCELLED","slug":"ad-cessna-185-15-control-systems-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":72341,"registerId":"commonwealth-F2008L00169-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 185 Series Aeroplanes","sectionType":"division","heading":"Cessna 185 Series Aeroplanes","content":"### Cessna 185 Series Aeroplanes\n\n| AD/CESSNA 185/15 | Control Systems | 2/2008 |\n| ---------------- | --------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                                                |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 14 February 2008.                                                                                                                                                                                                                                                                                 |\n| Background:  | This is a unique Australian AD issued in 1970 requiring a once off replacement of a number of NAS 679 lock nuts installed on Cessna aircraft between April and November in 1969. These nuts were suspected to have a manufacturing flaw. As all nuts would have now been replaced, the unsafe condition no longer exists. |\n\n![](image.001.png)\n\nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n20 December 2007","sortOrder":0},{"sectionNumber":"AD/CESSNA 185/15","sectionType":"part","heading":"AD/CESSNA 185/15","content":"## AD/CESSNA 185/15","sortOrder":1},{"sectionNumber":"Control Systems","sectionType":"part","heading":"Control Systems","content":"## Control Systems","sortOrder":2},{"sectionNumber":"2/2008","sectionType":"part","heading":"2/2008","content":"## 2/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1854},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument maintains the narrow, specific scope of the original 1970 directive (targeting a particular aircraft model and part batch) by simply extinguishing the requirement. There is no expansion beyond the original purpose."},"complexity_factors":["Single operative provision cancelling a previous instrument","No definitions or interpretation section","No cross-references to other legislative provisions","No conditional logic or exceptions"],"plain_english_summary":"This instrument formally scraps a 38-year-old aircraft safety rule.\n\n**What it does**\nIt cancels Airworthiness Directive (AD) 185/15, which since 1970 had required owners of Cessna 185 series aeroplanes to replace specific lock nuts on their control systems.\n\n**Why it matters**\nThe original rule targeted a suspected manufacturing flaw in NAS 679 lock nuts installed during April–November 1969. Because all affected nuts would have been replaced during routine maintenance long before 2008, the safety risk no longer exists. This cancellation removes the obsolete legal obligation.\n\n**Who is affected**\nOwners and operators of Cessna 185 aircraft. In practice, no action is required—the directive simply ceases to have effect from 14 February 2008."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-185-15-control-systems-cancelled","history":"/api/acts/ad-cessna-185-15-control-systems-cancelled/history","analysis":"/api/acts/ad-cessna-185-15-control-systems-cancelled/analysis","conflicts":"/api/acts/ad-cessna-185-15-control-systems-cancelled/conflicts","importantCases":"/api/acts/ad-cessna-185-15-control-systems-cancelled/important-cases","documents":"/api/acts/ad-cessna-185-15-control-systems-cancelled/documents"}}