{"id":"F2006B06739","name":"AD/S-76/63 - Main Rotor Blade Root and Pocket Separation","slug":"ad-s-76-63-main-rotor-blade-root-and-pocket-separation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114566,"registerId":"commonwealth-F2006B06739-current","compilationNumber":null,"startDate":"2026-04-03","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/S-76/63 Main Rotor Blade Root and Poc","sectionType":"part","heading":"AD/S-76/63 Main Rotor Blade Root and Pocket Separation 7/2000","content":"# AD/S-76/63 Main Rotor Blade Root and Pocket Separation 7/2000\n\nTX\n\nApplicability: All models S76 with main rotor blades not repaired in accordance with Overhaul and Repair Instruction (ORI) No. 76150-023 Revision A dated 26 May 2000.\n\nRequirement: Action in accordance with Sikorsky Aircraft Corp. ASB No. 76-65-50 dated 25 May 2000.\n\nNote: FAA Emergency AD 2000-11-52 refers.\n\nCompliance: Before further flight after the effective date of this directive.\n\nThis Airworthiness Directive becomes effective on 1 June 2000.\n\nBackground: This directive is issued due to a report of a 20 inch crack in the root end pocket of a main rotor blade and three reports of root end pocket separation of 4 to 6 foot sections of main rotor blade during flight. These unsafe conditions are attributed to improper manufacture of certain main rotor blade skins.\n\n![Signature of Bernard Malcolm Hole Delegate of the Civil Aviation Safety Authority](image.003.png)  \n\nBernard Malcolm Hole\n\nDelegate of the Civil Aviation Safety Authority 30 May 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 1 June 2000.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted emergency safety directive addressing a specific mechanical defect in a specific aircraft model. The scope remains precisely limited to the unsafe condition described (main rotor blade root pocket separation) and has not expanded beyond this original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 3 operative sections: Applicability, Requirement, and Compliance","Single cross-reference to FAA Emergency AD 2000-11-52 (informational only)","No defined terms section — relies on standard aviation terminology","Simple conditional logic: if aircraft type S-76 AND blades not repaired per specific ORI, then action required","No nested exceptions or sub-paragraphs with multiple conditions","Clear, unambiguous compliance deadline (before further flight)"],"plain_english_summary":"This CASA Airworthiness Directive orders immediate grounding and mandatory compliance with Sikorsky’s emergency service bulletin for all Sikorsky S‑76 helicopters whose main rotor blades were not repaired by 26 May 2000. It affects owners/operators with unrepaired blades and responds to a life‑threatening manufacturing defect that caused blade cracking and in‑flight separations. Compliance is required before further flight; effective 1 June 2000."},"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":3,"scope_assessment":{"changed":false,"description":"Scope has not been expanded beyond its stated purpose in the instrument: it applies only to S‑76 helicopters with main rotor blades not repaired per ORI No. 76150‑023 Rev A and requires corrective action per Sikorsky ASB No. 76‑65‑50 before further flight. The directive narrows applicability by excluding blades already repaired under the specified ORI and depends on external technical instructions for execution (Applicability; Requirement; Compliance)."},"complexity_factors":["References external technical documents (Sikorsky ASB No. 76‑65‑50 and ORI No. 76150‑023 Rev A) for required work, creating dependency on non‑legislative materials (Requirement; Applicability).","Immediate compliance requirement ('before further flight') imposes urgent operational disruption and logistics burden on operators (Compliance).","Narrow applicability tied to repair history (only blades not repaired per the specified ORI), requiring record checks to determine applicability (Applicability).","Safety‑critical subject matter requires specialised technical competence to interpret and implement the ASB and ORI.","Cross‑reference to FAA Emergency AD introduces interjurisdictional reliance on foreign regulator findings (Note).","Limited procedural detail in the directive itself shifts substantive implementation discretion to the manufacturer document and maintenance organisations (Requirement)."],"plain_english_summary":"This Airworthiness Directive mandates that all Sikorsky S‑76 helicopters whose main rotor blades have not been repaired per Overhaul and Repair Instruction No. 76150‑023 Rev A must be inspected and corrected in accordance with Sikorsky Alert Service Bulletin No. 76‑65‑50 before further flight (Applicability; Requirement; Compliance). CASA issued the directive after reports of a 20‑inch crack and multi‑foot root‑end pocket separations attributed to improper manufacture. Operators must arrange and pay for the inspections/repairs; the directive points to manufacturer and FAA guidance for the technical steps."}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-76-63-main-rotor-blade-root-and-pocket-separation","history":"/api/acts/ad-s-76-63-main-rotor-blade-root-and-pocket-separation/history","analysis":"/api/acts/ad-s-76-63-main-rotor-blade-root-and-pocket-separation/analysis","conflicts":"/api/acts/ad-s-76-63-main-rotor-blade-root-and-pocket-separation/conflicts","importantCases":"/api/acts/ad-s-76-63-main-rotor-blade-root-and-pocket-separation/important-cases","documents":"/api/acts/ad-s-76-63-main-rotor-blade-root-and-pocket-separation/documents"}}