{"id":"F2006B04321","name":"AD/BELL 204/13 Amdt 2 - Tail Rotor Pitch Change Chain","slug":"ad-bell-204-13-amdt-2-tail-rotor-pitch-change-chain","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44136,"registerId":"commonwealth-F2006B04321-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 204/13 Amdt 2 - Tail Rotor Pitch Change Chain","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \n![](image.002.png)  \nBell Helicopter Textron 204 Series Helicopters\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/BELL 204/13 Amdt 1 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nAD/BELL 204/13\n\nAmdt 2\n\n  \nTail Rotor Pitch Change Chain 8/2000\n\nApplicability: Model 204 with tail rotor pitch change chains P/N204-001-739-3 installed. Requirement: Action in accordance with FAA AD 76-12-07.\n\nCompliance: Before further flight after the effective date of this directive, thereafter at intervals not exceeding 25 hours’ time in service.\n\nThis Amendment becomes effective on 10 August 2000.\n\nBackground: This directive is to inspect a particular pitch change chain not otherwise covered by AD/Bell 204/6 Amdt 12. It also follows the re-introduction of the AD Series after sixteen years.\n\n![](image.003.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 6 July 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 12 July 2000.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2088},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original safety purpose of the Airworthiness Directive series: correcting unsafe conditions in aircraft components. While it revokes Amendment 1 and specifically addresses a chain variant not previously covered by AD/Bell 204/6, it does not expand beyond the core legislative scope of ensuring aviation safety for Bell 204 helicopter tail rotor systems."},"complexity_factors":["Incorporates external US Federal Aviation Administration technical standard by reference (FAA AD 76-12-07)","Narrow applicability defined by specific manufacturer part number (P/N204-001-739-3)","Dual-phase compliance schedule requiring both immediate action and recurring 25-hour intervals","Revocation and replacement of prior legislative instrument (Amendment 1) while maintaining continuity of obligation"],"plain_english_summary":"This mandatory safety order requires owners/operators of Bell 204 helicopters fitted with tail rotor part 204-001-739-3 to inspect the tail rotor pitch change chain per FAA AD 76-12-07 immediately before the next flight after 10 Aug 2000 and every 25 flight hours thereafter. \n\nIt reinstates and narrows prior directives to cover a chain type previously omitted; failure or wear can cause loss of tail-rotor control and an uncontrollable spin, so compliance is critical for flight safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-204-13-amdt-2-tail-rotor-pitch-change-chain","history":"/api/acts/ad-bell-204-13-amdt-2-tail-rotor-pitch-change-chain/history","analysis":"/api/acts/ad-bell-204-13-amdt-2-tail-rotor-pitch-change-chain/analysis","conflicts":"/api/acts/ad-bell-204-13-amdt-2-tail-rotor-pitch-change-chain/conflicts","importantCases":"/api/acts/ad-bell-204-13-amdt-2-tail-rotor-pitch-change-chain/important-cases","documents":"/api/acts/ad-bell-204-13-amdt-2-tail-rotor-pitch-change-chain/documents"}}