{"id":"F2008L00172","name":"AD/CESSNA 177/8 - Control Systems - CANCELLED","slug":"ad-cessna-177-8-control-systems-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":72349,"registerId":"commonwealth-F2008L00172-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 177 Series Aeroplanes","sectionType":"division","heading":"Cessna 177 Series Aeroplanes","content":"### Cessna 177 Series Aeroplanes\n\n| AD/CESSNA 177/8 | 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 177/8","sectionType":"part","heading":"AD/CESSNA 177/8","content":"## AD/CESSNA 177/8","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":1665},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument terminates the legislation entirely rather than expanding or modifying its scope. It represents a sunsetting of the regulatory requirement due to obsolescence rather than a scope expansion."},"complexity_factors":["Single operative provision (cancellation)","No defined terms or interpretive sections","No conditional logic, exceptions, or cross-references to other instruments","Document consists entirely of historical background and cancellation statement"],"plain_english_summary":"This document cancels an old aviation safety rule that applied to Cessna 177 series aeroplanes (light aircraft).\n\n**What it does:**\n- Cancels Airworthiness Directive (AD) number 177/8, effective 14 February 2008\n- This means aircraft owners and mechanics no longer need to follow the old rule\n\n**The old rule (from 1970):**\n- Required a one-time replacement of specific lock nuts (NAS 679) on control systems\n- These nuts were installed between April and November 1969 and had a manufacturing defect that could affect flight safety\n\n**Why it's being cancelled:**\n- Nearly 40 years have passed since the faulty nuts were installed\n- All affected nuts would have been replaced by now through normal maintenance\n- The unsafe condition no longer exists, so the rule is unnecessary\n\n**Who this affects:**\n- Owners and operators of Cessna 177 series aircraft\n- Aircraft maintenance engineers"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-177-8-control-systems-cancelled","history":"/api/acts/ad-cessna-177-8-control-systems-cancelled/history","analysis":"/api/acts/ad-cessna-177-8-control-systems-cancelled/analysis","conflicts":"/api/acts/ad-cessna-177-8-control-systems-cancelled/conflicts","importantCases":"/api/acts/ad-cessna-177-8-control-systems-cancelled/important-cases","documents":"/api/acts/ad-cessna-177-8-control-systems-cancelled/documents"}}