{"id":"F2006B06454","name":"AD/R22/49 - Main Rotor Drive Shaft Yoke Half Assembly","slug":"ad-r22-49-main-rotor-drive-shaft-yoke-half-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47912,"registerId":"commonwealth-F2006B06454-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.002.png)\n\n![](image.002.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.","sortOrder":0},{"sectionNumber":"AD/R22/49 Main Rotor Drive Shaft Yoke Ha","sectionType":"part","heading":"AD/R22/49 Main Rotor Drive Shaft Yoke Half Assembly 12/2000","content":"# AD/R22/49 Main Rotor Drive Shaft Yoke Half Assembly 12/2000\n\nTX\n\nApplicability: Model R22 helicopters, with a yoke half assembly part number A203-5 installed. Requirement: 1. Inspect each yoke for evidence of cracking, refer to Figure A.\n\nIf a yoke is cracked, before further flight, replace the yokes with serviceable yokes, part number A203-7. Both yokes must be replaced with yokes part number A203- 7.\n\n2. Determine the Lot identifier of each yoke, P/N A203-5.\n\nIf the Lot identifier is from 24 through 43, if it is in letter code, or if it is illegible, replace yokes part number A203-5, with serviceable yokes part number A203-7. Yoke part number A203-7 cannot be installed with yoke part number A203-5.\n\n![](image.003.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 targeted safety directive addressing a specific mechanical defect in a specific helicopter model. It has not expanded beyond its original purpose of ensuring airworthiness of the main rotor drive shaft yoke assembly."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined part numbers (A203-5 and A203-7)","Simple conditional logic: IF cracked OR IF Lot 24-43/illegible THEN replace","Single applicability criterion (Model R22 helicopters with specific part)","No cross-references to other legislation or regulations beyond the enabling provision (subregulation 39.1(1) of CAR 1998)","Clear visual reference to Figure A (though image not reproduced in text)","Straightforward compliance requirement: replace before further flight"],"plain_english_summary":"This AD requires owners/operators of Robinson R22 helicopters with yoke half assembly A203‑5 to inspect those parts for cracks and verify their lot identifier, and to replace suspect or unreadable/batch‑affected yokes with the new A203‑7 units (both yokes must be replaced and cannot be mixed). It targets a suspected production defect to prevent catastrophic main‑rotor drive failure."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD defines a targeted scope confined to R22 helicopters with yoke half P/N A203-5 and prescribes inspection and replacement rules tied to crack detection and specific Lot identifiers. The text contains no provision expanding or narrowing that applicability beyond those stated criteria."},"complexity_factors":["Narrow applicability: limited to Model R22 helicopters fitted with yoke half P/N A203-5 (Applicability).","Simple failure check: visual inspection for cracking with replacement required before further flight if crack found (Requirement 1).","Lot-based mandatory replacement: replacement required where Lot identifier is 24–43, is a letter code, or is illegible (Requirement 2).","Binary compatibility rule: A203-7 cannot be installed together with A203-5, requiring simultaneous replacement of both yokes when action is taken (Requirement 1 and 2).","Implementation ambiguity/risk: determining \"letter code\" versus numeric Lot or dealing with illegible identifiers may create inspection ambiguity and record-checking burden (Requirement 2).","Operational impact: immediate 'before further flight' timing for cracked parts can create logistical and parts-supply pressures for operators (Requirement 1)."],"plain_english_summary":"This Airworthiness Directive applies to Robinson R22 helicopters with main rotor yoke half part number A203-5. It requires operators to inspect each yoke for cracks and to replace both yokes with serviceable part number A203-7 before further flight if a crack is found. It also requires checking each A203-5 lot identifier and replacing those with lot 24–43, letter codes, or illegible identifiers with A203-7. Compliance imposes inspection and parts-replacement costs on owners/operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-r22-49-main-rotor-drive-shaft-yoke-half-assembly","history":"/api/acts/ad-r22-49-main-rotor-drive-shaft-yoke-half-assembly/history","analysis":"/api/acts/ad-r22-49-main-rotor-drive-shaft-yoke-half-assembly/analysis","conflicts":"/api/acts/ad-r22-49-main-rotor-drive-shaft-yoke-half-assembly/conflicts","importantCases":"/api/acts/ad-r22-49-main-rotor-drive-shaft-yoke-half-assembly/important-cases","documents":"/api/acts/ad-r22-49-main-rotor-drive-shaft-yoke-half-assembly/documents"}}