{"id":"F2008L01808","name":"AD/CESSNA 185/4 - Tail Wheel Assembly - CANCELLED","slug":"ad-cessna-185-4-tail-wheel-assembly-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":73973,"registerId":"commonwealth-F2008L01808-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 185 Series Aeroplanes","sectionType":"division","heading":"Cessna 185 Series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 185/4 | Tail Wheel Assembly | 7/2008 |\n| --------------- | ------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                                                                                   |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n|              | This AD is cancelled on 3 July 2008.                                                                                                                                                                                                                                                                                                                         |\n| Background:  | This unique Australian AD, issued in 1963, required modification to the tail wheel in accordance with Cessna service letter SE 62-73 to improve the service life on the locking mechanism. The AD required compliance within 500 hours time in service after 1 March 1963. As all affected aircraft would have been modified, this AD is no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n22 May 2008","sortOrder":0},{"sectionNumber":"AD/CESSNA 185/4","sectionType":"part","heading":"AD/CESSNA 185/4","content":"## AD/CESSNA 185/4","sortOrder":1},{"sectionNumber":"Tail Wheel Assembly","sectionType":"part","heading":"Tail Wheel Assembly","content":"## Tail Wheel Assembly","sortOrder":2},{"sectionNumber":"7/2008","sectionType":"part","heading":"7/2008","content":"## 7/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1672},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument simply cancels a previous airworthiness directive without expanding, narrowing, or altering its scope. It represents a straightforward repeal of spent provisions rather than scope creep."},"complexity_factors":["Single operative provision (cancellation)","No defined terms or interpretation section","No cross-references to other legislation","Straightforward factual background with no conditional logic or exceptions"],"plain_english_summary":"**What this does:** This document officially scraps an old aircraft safety rule that is no longer needed.\n\n**The backstory:** In 1963, Australia’s aviation safety authority ordered owners of Cessna 185 series aeroplanes to modify the tail wheel assembly. The original rule (issued as Airworthiness Directive 4 for the Cessna 185) required fixing the locking mechanism on the tail wheel to prevent failures, following guidance from the manufacturer (Cessna service letter SE 62-73). Owners had to complete the work within 500 flight hours after March 1963.\n\n**Why it’s cancelled:** Because that deadline passed more than 40 years ago, every affected aircraft has already been modified. The rule is now redundant. This document formally cancels the old directive as of 3 July 2008, removing it from the books."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-185-4-tail-wheel-assembly-cancelled","history":"/api/acts/ad-cessna-185-4-tail-wheel-assembly-cancelled/history","analysis":"/api/acts/ad-cessna-185-4-tail-wheel-assembly-cancelled/analysis","conflicts":"/api/acts/ad-cessna-185-4-tail-wheel-assembly-cancelled/conflicts","importantCases":"/api/acts/ad-cessna-185-4-tail-wheel-assembly-cancelled/important-cases","documents":"/api/acts/ad-cessna-185-4-tail-wheel-assembly-cancelled/documents"}}