{"id":"F2006B06720","name":"AD/S-76/39 Amdt 1 - Main Rotor Blade Tip Block and Tip End Assemblies - Inspection and Rectification","slug":"ad-s-76-39-amdt-1-main-rotor-blade-tip-block-and-tip-end-assemblies-inspection-and-rectification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114540,"registerId":"commonwealth-F2006B06720-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/S-76/39 Amdt 1 - Main Rotor Blade Tip Block and Tip End Assemblies - Inspection and Rectification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Sikorsky S-76 Series Helicopters\n\n \n\nAD/S-76/39\n\nAmdt 1\n\n\nMain Rotor Blade Tip Block and Tip End Assemblies - Inspection and Rectification\n\n\n7/85\n\nDM\n\n \n\nApplicability: All model S-76A Helicopters fitted with main rotor blades prior to S/N A086-01461. Requirement:              Sikorsky Alert S.B. 76-65-36. Amdt 1.\n\nCompliance: Unless already accomplished, as detailed in the requirement document.\n\n \n\nBackground: 1. The manufacturer has advised that an operator has experienced the loss of a main rotor blade tip block.\n\n \n\n2. This Directive is amended to include an amendment to the Requirement Document, the intent of which results in changes to certain inspection criteria and the addition of a calendar compliance time.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1817},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Amendment 1 updates the existing directive with revised inspection criteria and additional calendar compliance times, but does not expand beyond the original scope of main rotor blade tip block safety for the specified S-76A helicopter models."},"complexity_factors":["Incorporation by reference of external technical document (Sikorsky Alert Service Bulletin 76-65-36 Amdt 1)","Applicability limited by specific manufacturer serial number cutoff","Requires specialized aviation technical knowledge to interpret 'tip block' and 'tip end assembly' requirements","Brief legislative text with substantive detail contained in referenced service bulletin"],"plain_english_summary":"This mandatory airworthiness directive requires operators of Sikorsky S‑76A helicopters with main rotor blades (serials before A086‑01461) to inspect the tip block and tip end assemblies per Sikorsky Alert Service Bulletin 76‑65‑36 (Amendment 1) and repair defects to the manufacturer's specifications. It responds to an in‑flight tip block separation that could cause catastrophic rotor failure; the amendment tightens procedures and adds a calendar compliance deadline to ensure timely inspections and repairs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-76-39-amdt-1-main-rotor-blade-tip-block-and-tip-end-assemblies-inspection-and-rectification","history":"/api/acts/ad-s-76-39-amdt-1-main-rotor-blade-tip-block-and-tip-end-assemblies-inspection-and-rectification/history","analysis":"/api/acts/ad-s-76-39-amdt-1-main-rotor-blade-tip-block-and-tip-end-assemblies-inspection-and-rectification/analysis","conflicts":"/api/acts/ad-s-76-39-amdt-1-main-rotor-blade-tip-block-and-tip-end-assemblies-inspection-and-rectification/conflicts","importantCases":"/api/acts/ad-s-76-39-amdt-1-main-rotor-blade-tip-block-and-tip-end-assemblies-inspection-and-rectification/important-cases","documents":"/api/acts/ad-s-76-39-amdt-1-main-rotor-blade-tip-block-and-tip-end-assemblies-inspection-and-rectification/documents"}}