{"id":"F2006B01831","name":"AD/A109/45 - Tail Rotor Hub and Blades Assembly","slug":"ad-a109-45-tail-rotor-hub-and-blades-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41029,"registerId":"commonwealth-F2006B01831-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/A109/45 Tail Rotor Hub and Blades Ass","sectionType":"part","heading":"AD/A109/45 Tail Rotor Hub and Blades Assembly 8/2003","content":"# AD/A109/45 Tail Rotor Hub and Blades Assembly 8/2003\n\nTX\n\nApplicability: All Model A109AII, A109C, and A109E helicopters.\n\nRequirement: Inspect in accordance with Agusta Technical Bulletin BT 109-117 or BT 109EP-36, as applicable.\n\nNote: ENAC AD 2003-214 refers.\n\nCompliance: Within 5 flight hours after 27 June 2003, unless already accomplished.\n\nThis Airworthiness Directive becomes effective on 27 June 2003.\n\nBackground: A report was received of the loss of a tail rotor assembly on an in-service Model A109K2 helicopter. Investigation is continuing as to the cause of the failure. This Directive requires a precautionary inspection of affected tail rotor installations to exclude possible incorrect installation, and to check for evidence of damage.\n\n![](image.002.png)  \n\nDavid Punshon\n\nDelegate of the Civil Aviation Safety Authority 27 June 2003\n\n![](image.001.png)","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive responding to a specific in-service failure. The scope remains tightly focused on the immediate safety issue — inspecting tail rotor assemblies on affected helicopter models to prevent catastrophic failure. No scope creep is evident."},"complexity_factors":["Very short document (under 300 words)","Only 3 defined applicability criteria (specific helicopter models)","Single requirement with clear alternative references (two technical bulletins)","Simple compliance deadline (5 flight hours from effective date)","No nested exceptions or conditional logic","No cross-references to other legislation beyond the enabling regulation (CASR 1998 subreg 39.1(1))","Straightforward background explaining the safety rationale"],"plain_english_summary":"This CASA safety order requires owners/operators of specified Agusta A109 models in Australia to inspect the tail‑rotor hub and blades per Agusta technical bulletins, within 5 flight hours of 27 June 2003. It’s mandatory: issued after a tail‑rotor assembly separation, the inspection is a precaution to detect incorrect installation or damage that could lead to failure."},"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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive's scope is consistent with its stated purpose: it applies to all listed A109 variants and requires a one-off inspection to exclude incorrect installation or damage. There is no indication in the text that the applicability or required action was expanded or narrowed from the directive's stated objective; obligations, timeframe and reference procedures are specified explicitly (Applicability, Requirement, Compliance, Background)."},"complexity_factors":["Narrow, urgent scope: single inspection requirement with a short compliance window (within 5 flight hours of 27 June 2003) (Compliance).","Reliance on external technical documents: inspections must follow Agusta Technical Bulletin BT 109-117 or BT 109EP-36, requiring access to and interpretation of manufacturer procedures (Requirement).","Broad applicability across three helicopter models creates operational reach for many operators (Applicability: A109AII, A109C, A109E).","Regulatory basis and enforcement: issued under CASR 1998 subregulation 39.1(1), giving CASA-delegate authority to mandate corrective action (preamble).","Uncertain root cause: directive is precautionary following an in-service loss while investigation continues, leaving possible follow-on actions depending on findings (Background).","Compliance burden concentrated on operators and maintenance providers who must perform technical inspections quickly and document results (Compliance & Requirement)."],"plain_english_summary":"This Airworthiness Directive orders operators of Agusta A109AII, A109C and A109E helicopters to perform a precautionary inspection of the tail-rotor hub and blades, following Agusta Technical Bulletin BT 109-117 or BT 109EP-36. The inspection must be done within 5 flight hours after 27 June 2003. CASA issued the directive under CASR subregulation 39.1(1) after a report that a tail-rotor assembly was lost, to check for incorrect installation or damage."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a109-45-tail-rotor-hub-and-blades-assembly","history":"/api/acts/ad-a109-45-tail-rotor-hub-and-blades-assembly/history","analysis":"/api/acts/ad-a109-45-tail-rotor-hub-and-blades-assembly/analysis","conflicts":"/api/acts/ad-a109-45-tail-rotor-hub-and-blades-assembly/conflicts","importantCases":"/api/acts/ad-a109-45-tail-rotor-hub-and-blades-assembly/important-cases","documents":"/api/acts/ad-a109-45-tail-rotor-hub-and-blades-assembly/documents"}}