{"id":"F2006B06701","name":"AD/S-76/19 - Main Rotor Blade - Tip Plate Assembly Retention Bolts - Inspection and Replacement","slug":"ad-s-76-19-main-rotor-blade-tip-plate-assembly-retention-bolts-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114509,"registerId":"commonwealth-F2006B06701-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/S-76/19 - Main Rotor Blade - Tip Plate Assembly Retention Bolts - Inspection and Replacement","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-76/19 Main Rotor Blade - Tip Plate Assembly Retention\n\nBolts - Inspection and Replacement\n\n\n6/81\n\n \n\nApplicability: All models.\n\n \n\nDocument: Sikorsky Alert SB 76-65-23. Compliance: As per requirement document.\n\nBackground: The manufacturer has advised the loss of a main rotor blade tip cap in flight.\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\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The supplied text provides no indication that the scope has been changed from any prior instrument or original intent. It plainly states applicability as \"All models\" and delegates technical requirements to Sikorsky Alert SB 76-65-23. Because the original intent or earlier scope is not included in the supplied text, there is no basis in this document to conclude the scope has changed."},"complexity_factors":["Directive text is short and delegates technical detail to an external manufacturer service bulletin (SB 76-65-23), requiring users to consult another document to know precise obligations.","Applies to all S-76 models, so population affected is broad even though procedural specifics are not included here (Applicability).","Safety-critical topic (main rotor blade tip cap loss) makes precise technical compliance important despite limited instructions in the AD (Background).","Compliance burden is diffuse: operators must obtain the bulletin, source parts, schedule maintenance and document compliance (Document; Compliance).","Potential operational impacts (downtime, parts availability) introduce logistical and commercial complexity for operators and maintenance providers."],"plain_english_summary":"This directive requires operators of all Sikorsky S‑76 series helicopters to inspect—and, if required, replace—the retention bolts for the main rotor blade tip plate assembly. It was issued after the manufacturer reported a tip cap was lost in flight.\n\nThe AD delegates inspection intervals and procedures to Sikorsky Alert Service Bulletin SB 76‑65‑23, so operators (owners, lessees, or their maintenance providers) must obtain that bulletin, perform the work, and bear the costs and downtime."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a narrow, specific safety purpose. It addresses a single mechanical defect in a specific aircraft type. There is no indication of scope creep — it does exactly what ADs are designed to do: mandate immediate safety action for a known hazard."},"complexity_factors":["Very short document (approximately 150 words)","No defined terms section","No cross-references to other legislation beyond pointing to a single manufacturer service bulletin","Simple conditional logic: 'all models' applicability with no exceptions or nested conditions","Single operational requirement: inspect and replace per external document","No penalty provisions, appeal mechanisms, or administrative procedures included"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to all **Sikorsky S-76 series helicopters**.\n\n**What it does:**\n- Requires operators to inspect and potentially replace specific bolts that hold the main rotor blade tip plate assembly together.\n- These bolts are critical — if they fail, the tip cap (the end piece of the rotor blade) can detach in flight, which is extremely dangerous.\n\n**Why it exists:**\n- The manufacturer (Sikorsky) reported an incident where a main rotor blade tip cap was lost during flight. This directive prevents that from happening again.\n\n**Who must comply:**\n- Anyone operating a Sikorsky S-76 helicopter in Australia must follow the inspection and replacement procedures outlined in Sikorsky Alert Service Bulletin 76-65-23.\n\n**What operators need to do:**\n- Follow the manufacturer's service bulletin for inspection schedules and replacement criteria. The directive itself doesn't specify exact dates — it points to the manufacturer's document for those details."}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-76-19-main-rotor-blade-tip-plate-assembly-retention-bolts-inspection-and-replacement","history":"/api/acts/ad-s-76-19-main-rotor-blade-tip-plate-assembly-retention-bolts-inspection-and-replacement/history","analysis":"/api/acts/ad-s-76-19-main-rotor-blade-tip-plate-assembly-retention-bolts-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-s-76-19-main-rotor-blade-tip-plate-assembly-retention-bolts-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-s-76-19-main-rotor-blade-tip-plate-assembly-retention-bolts-inspection-and-replacement/important-cases","documents":"/api/acts/ad-s-76-19-main-rotor-blade-tip-plate-assembly-retention-bolts-inspection-and-replacement/documents"}}