{"id":"F2008L00171","name":"AD/CESSNA 180/26 - Control Systems - CANCELLED","slug":"ad-cessna-180-26-control-systems-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":72346,"registerId":"commonwealth-F2008L00171-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 180, 182 and Wren 460 Series Aero","sectionType":"division","heading":"Cessna 180, 182 and Wren 460 Series Aeroplanes","content":"### Cessna 180, 182 and Wren 460 Series Aeroplanes\n\n| AD/CESSNA 180/26 | 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 180/26","sectionType":"part","heading":"AD/CESSNA 180/26","content":"## AD/CESSNA 180/26","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":1398},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":true,"description":"This instrument terminates the entire regulatory scheme established by the original 1970 AD, reducing the scope from an active safety mandate to nil. The original intent (ensuring replacement of faulty nuts) has been fully satisfied, and this cancellation formally concludes the legislative lifecycle of the requirement."},"complexity_factors":["Single-purpose cancellation instrument with no operative provisions","No defined terms or interpretation sections","No conditional logic, exceptions, or cross-references to other legislation","Extremely short (under 200 words of substantive content)"],"plain_english_summary":"This legislation **cancels an old aircraft safety rule** from 1970 that required owners of specific Cessna aircraft (models 180, 182, and Wren 460) to replace faulty lock nuts.\n\n**What it does**\n- Officially scraps Airworthiness Directive (AD) number 26, which mandated a one-time replacement of NAS 679 lock nuts installed during April–November 1969\n- States that the unsafe condition no longer exists because all the faulty nuts would have been replaced by now\n\n**Who it affects**\n- Owners and operators of the affected Cessna aircraft series\n- Practically speaking, this removes a long-completed compliance obligation from the books\n\n**Why it matters**\n- Cleans up the aviation safety regulations by removing obsolete requirements\n- Reduces regulatory clutter for aircraft maintenance records"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-180-26-control-systems-cancelled","history":"/api/acts/ad-cessna-180-26-control-systems-cancelled/history","analysis":"/api/acts/ad-cessna-180-26-control-systems-cancelled/analysis","conflicts":"/api/acts/ad-cessna-180-26-control-systems-cancelled/conflicts","importantCases":"/api/acts/ad-cessna-180-26-control-systems-cancelled/important-cases","documents":"/api/acts/ad-cessna-180-26-control-systems-cancelled/documents"}}