{"id":"F2008L00546","name":"AD/CESSNA 170/3 - Nose Wheel Strut - CANCELLED","slug":"ad-cessna-170-3-nose-wheel-strut-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119459,"registerId":"commonwealth-F2008L00546-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 170, 172, F172, FR172 and 175 Ser","sectionType":"division","heading":"Cessna 170, 172, F172, FR172 and 175 Series Aeroplanes","content":"### Cessna 170, 172, F172, FR172 and 175 Series Aeroplanes\n\n| AD/CESSNA 170/3 | Nose Wheel Strut | 3/2008 |\n| --------------- | ---------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                                                    |\n| ------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 13 March 2008.                                                                                                                                                                                                                                                                                        |\n| Background:  | This is a unique Australian AD issued in 1959. This required a large washer to be installed on the nose wheel strut to provide a positive seat for the steering arm assembly to prevent it slipping down over the shoulder of the outer barrel. As all aircraft would now be modified, the unsafe condition no longer exists. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n31 January 2008","sortOrder":0},{"sectionNumber":"AD/CESSNA 170/3","sectionType":"part","heading":"AD/CESSNA 170/3","content":"## AD/CESSNA 170/3","sortOrder":1},{"sectionNumber":"Nose Wheel Strut","sectionType":"part","heading":"Nose Wheel Strut","content":"## Nose Wheel Strut","sortOrder":2},{"sectionNumber":"3/2008","sectionType":"part","heading":"3/2008","content":"## 3/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1454},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument terminates an existing Airworthiness Directive without expanding or altering the regulatory scope. It removes compliance obligations rather than creating new ones."},"complexity_factors":["Single operative provision (cancellation)","No defined terms or interpretation sections","No cross-references to other legislation","No conditional logic or exceptions","Minimal text (under 200 words of substantive content)"],"plain_english_summary":"This document **cancels a 49-year-old aircraft safety rule** that applied to specific Cessna aeroplane models (170, 172, F172, FR172 and 175 series).\n\n**What the old rule required:**\nThe original 1959 directive required owners to install a large washer on the nose wheel strut (the shock-absorbing front landing gear leg). This washer stopped the steering arm assembly from slipping down the strut barrel, which could cause loss of steering control.\n\n**What this document does:**\nIt formally ends the requirement as of **13 March 2008**. The Civil Aviation Safety Authority cancelled the rule because nearly all affected aircraft would have been modified by now, meaning the unsafe condition no longer exists in operational planes.\n\n**Who is affected:**\nOwners and operators of the specified Cessna models. No action is required—the cancellation removes an old obligation rather than imposing a new one."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-170-3-nose-wheel-strut-cancelled","history":"/api/acts/ad-cessna-170-3-nose-wheel-strut-cancelled/history","analysis":"/api/acts/ad-cessna-170-3-nose-wheel-strut-cancelled/analysis","conflicts":"/api/acts/ad-cessna-170-3-nose-wheel-strut-cancelled/conflicts","importantCases":"/api/acts/ad-cessna-170-3-nose-wheel-strut-cancelled/important-cases","documents":"/api/acts/ad-cessna-170-3-nose-wheel-strut-cancelled/documents"}}