{"id":"F2008L00176","name":"AD/CESSNA 150/16 Amdt 1 - Control Systems - CANCELLED","slug":"ad-cessna-150-16-amdt-1-control-systems-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":72359,"registerId":"commonwealth-F2008L00176-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 150, F150, 152 & F152 Series Aero","sectionType":"division","heading":"Cessna 150, F150, 152 & F152 Series Aeroplanes","content":"### Cessna 150, F150, 152 & F152 Series Aeroplanes\n\n| AD/CESSNA 150/16 Amdt 1 | 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 exits. |\n\n![](image.001.png)\n\nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n19 December 2007","sortOrder":0},{"sectionNumber":"AD/CESSNA 150/16 Amdt 1","sectionType":"part","heading":"AD/CESSNA 150/16 Amdt 1","content":"## AD/CESSNA 150/16 Amdt 1","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":1902},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This amendment performs exactly as labelled—it cancels Airworthiness Directive AD/CESSNA 150/16. The scope remains strictly limited to revoking that specific directive and does not expand into new regulatory territory."},"complexity_factors":["Single operative provision (one-word cancellation)","No defined terms or interpretation clause","No cross-references to other legislative instruments","No conditional logic, exceptions, or transitional provisions","Straightforward factual background with no legal tests"],"plain_english_summary":"This document officially scraps an outdated aircraft safety rule about faulty nuts.\n\n**The backstory**\nIn 1970, Australian aviation authorities ordered owners of specific Cessna planes (models 150, F150, 152 and F152) to replace certain lock nuts installed between April and November 1969. The nuts (called NAS 679s) had a suspected manufacturing defect that could potentially affect flight control systems.\n\n**Why cancel it now?**\nNearly 40 years later, every single one of those nuts has been replaced during routine maintenance. The unsafe condition no longer exists, making the rule redundant.\n\n**What this means**\nAs of 14 February 2008, owners and operators of these aircraft no longer need to comply with this specific directive. The cancellation simply tidies up the rulebook by removing a requirement that has already been effectively completed across the entire fleet."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-150-16-amdt-1-control-systems-cancelled","history":"/api/acts/ad-cessna-150-16-amdt-1-control-systems-cancelled/history","analysis":"/api/acts/ad-cessna-150-16-amdt-1-control-systems-cancelled/analysis","conflicts":"/api/acts/ad-cessna-150-16-amdt-1-control-systems-cancelled/conflicts","importantCases":"/api/acts/ad-cessna-150-16-amdt-1-control-systems-cancelled/important-cases","documents":"/api/acts/ad-cessna-150-16-amdt-1-control-systems-cancelled/documents"}}