{"id":"F2006B07618","name":"AD/Y12/4 - LW-6 Wheel and LS-117 Disc Braked Wheel","slug":"ad-y12-4-lw-6-wheel-and-ls-117-disc-braked-wheel","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50332,"registerId":"commonwealth-F2006B07618-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (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\nHarbin Y12 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/Y12/4 LW-6 Wheel and LS-117 Disc Brak","sectionType":"part","heading":"AD/Y12/4 LW-6 Wheel and LS-117 Disc Braked Wheel 3/2003","content":"# AD/Y12/4 LW-6 Wheel and LS-117 Disc Braked Wheel 3/2003\n\nApplicability: All Y12 aircraft equipped with LW-6 wheel and LS-117 disc braked wheel. Requirement: Action in accordance with Harbin Aircraft Service Bulletin No. Y12-32-0038.\n\nNote: China CAAC AD CAD92-Y012-07 refers.\n\nCompliance: As specified in the Requirement document.\n\nThis Airworthiness Directive becomes effective on 20 March 2003.\n\nBackground: The CAAC requires certain actions to ensure the serviceability of LW-6 wheels and LS-117 disc braked wheels.\n\n![Signature of David Alan Villiers Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 29 January 2003\n\n![](image.001.png)","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive targeting a specific safety issue with specific aircraft parts. It has not expanded beyond its original purpose of mandating corrective action for the identified wheel assemblies."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined terms implicitly referenced (the wheel part numbers LW-6 and LS-117)","Single cross-reference to external document (Harbin Service Bulletin Y12-32-0038)","No conditional logic or nested exceptions — straightforward applicability ('All Y12 aircraft equipped with...')","No internal definitions section — relies entirely on external technical documents","Simple structure: Applicability → Requirement → Compliance → Background"],"plain_english_summary":"This CASA Airworthiness Directive mandates that owners/operators of Harbin Y12 aircraft fitted with LW-6 wheels or LS-117 disc-braked wheels comply with Harbin Aircraft Service Bulletin No. Y12-32-0038 to correct identified safety issues.  \n\nCAAC found defects in these wheel components; this AD enforces the manufacturer’s repair instructions in Australia to preserve airworthiness and avoid legal non-compliance."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD adopts the CAAC-identified issue and requires actions specified in the Harbin service bulletin; there is no indication in the text that the scope was narrowed or expanded beyond addressing LW-6 wheel and LS-117 disc-brake serviceability for Y12 aircraft (Applicability, Requirement, Background)."},"complexity_factors":["Limited scope but mandatory applicability: applies to all Y12 aircraft equipped with LW-6 wheels and LS-117 disc-braked wheels (Applicability).","Dependency on an external technical document for required work: compliance is to be performed 'in accordance with Harbin Aircraft Service Bulletin No. Y12-32-0038' (Requirement).","Compliance timing and detailed procedures are not set out in the AD itself; operators must consult the Service Bulletin for exact actions and deadlines (Compliance + Requirement).","Regulatory cross-reference to a foreign authority's AD (China CAAC AD CAD92-Y012-07), creating reliance on another regulator's findings (Note/Background).","Enforcement and effective date are set by CASA (effective 20 March 2003) and the CASA delegate signs the AD, leaving limited discrete administrative discretion (effective date & signature).","Operational burden concentrated on aircraft owners and maintenance organisations who must obtain, interpret and implement the Service Bulletin; no cost estimates or exemptions included (Requirement/Compliance)."],"plain_english_summary":"This Airworthiness Directive requires Harbin Y12 aeroplanes fitted with LW-6 wheels and LS-117 disc-braked wheels to carry out the actions specified in Harbin Aircraft Service Bulletin No. Y12-32-0038. It applies to operators and maintenance organisations responsible for those aircraft and matters because it sets mandatory maintenance/inspection actions CASA considers necessary to correct an unsafe condition identified by the CAAC."}},"importantCases":[],"_links":{"self":"/api/acts/ad-y12-4-lw-6-wheel-and-ls-117-disc-braked-wheel","history":"/api/acts/ad-y12-4-lw-6-wheel-and-ls-117-disc-braked-wheel/history","analysis":"/api/acts/ad-y12-4-lw-6-wheel-and-ls-117-disc-braked-wheel/analysis","conflicts":"/api/acts/ad-y12-4-lw-6-wheel-and-ls-117-disc-braked-wheel/conflicts","importantCases":"/api/acts/ad-y12-4-lw-6-wheel-and-ls-117-disc-braked-wheel/important-cases","documents":"/api/acts/ad-y12-4-lw-6-wheel-and-ls-117-disc-braked-wheel/documents"}}