{"id":"F2006B01827","name":"AD/A109/41 - Main rotor rotating scissor assy","slug":"ad-a109-41-main-rotor-rotating-scissor-assy","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41025,"registerId":"commonwealth-F2006B01827-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\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 CASR 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\n![](image.001.png)  \n\nAgusta A109 Series Helicopters","sortOrder":0},{"sectionNumber":"AD/A109/41 Main Rotor Rotating Scissor A","sectionType":"part","heading":"AD/A109/41 Main Rotor Rotating Scissor Assy 6/2003","content":"# AD/A109/41 Main Rotor Rotating Scissor Assy 6/2003\n\nApplicability: All Model A109E helicopters.\n\nRequirement: Action in accordance with Agusta Mandatory Service Bulletin No. 109EP-12, dated 24 July 2000.\n\nNote: ENAC AD2000-371 refers.\n\nCompliance: Before 30 June 2003, unless already accomplished.\n\nThis Airworthiness Directive becomes effective on 12 June 2003.\n\nBackground: Reports were received of fatigue failure of the swashplate outer ring attachment bolt.\n\nInvestigation revealed incorrect installation of the lower link of the main rotor rotating scissor assembly.\n\n![](image.002.jpeg)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 16 April 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 21 May 2003.","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","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 mechanical defect in a specific helicopter model. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined applicability criterion (Model A109E helicopters)","Single, unambiguous requirement referencing an external technical document","Simple compliance deadline with one exception clause ('unless already accomplished')","No nested conditions, cross-references to other legislation, or interpretive provisions","Background is factual narrative rather than legal reasoning"],"plain_english_summary":"This AD requires owners/operators of Agusta A109E helicopters to inspect and repair the main rotor rotating scissor assembly to address a bolt fatigue risk caused by incorrect lower-link installation.  \n\nCompliance with Agusta Mandatory Service Bulletin No. 109EP-12 is mandated before 30 June 2003. It affects anyone who owns, operates, or maintains A109E aircraft and prevents potential catastrophic loss of control."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive’s scope aligns with the stated safety issue: it mandates the manufacturer’s corrective service bulletin for all A109E helicopters to address incorrect installation and resultant fatigue failures. It does not expand beyond correcting that identified unsafe condition and sets a single compliance deadline."},"complexity_factors":["Narrow applicability — only affects all Model A109E helicopters (Applicability).","Direct reference to an external technical document — compliance requires following Agusta Mandatory Service Bulletin No. 109EP-12 (Requirement).","Clear, single corrective action and deadline — work must be done before 30 June 2003 (Compliance), reducing procedural ambiguity.","Technical nature of the remedy — inspection/repair of main rotor rotating scissor assembly involves specialist maintenance skills and parts (Background/Requirement).","Regulatory delegation — issued by a CASA delegate under CASR subregulation 39.1(1), creating enforceable obligation (preamble)."],"plain_english_summary":"This directive applies to all Agusta A109E helicopters. The CASA delegate requires operators to carry out the corrective work set out in Agusta Mandatory Service Bulletin No. 109EP-12 (dated 24 July 2000) to fix an incorrect installation of the main rotor rotating scissor lower link that has led to swashplate bolt fatigue failures. Operators must complete the mandated maintenance by 30 June 2003; operators pay for and schedule the work, while CASA enforces compliance through the airworthiness directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a109-41-main-rotor-rotating-scissor-assy","history":"/api/acts/ad-a109-41-main-rotor-rotating-scissor-assy/history","analysis":"/api/acts/ad-a109-41-main-rotor-rotating-scissor-assy/analysis","conflicts":"/api/acts/ad-a109-41-main-rotor-rotating-scissor-assy/conflicts","importantCases":"/api/acts/ad-a109-41-main-rotor-rotating-scissor-assy/important-cases","documents":"/api/acts/ad-a109-41-main-rotor-rotating-scissor-assy/documents"}}