{"id":"F2006B06697","name":"AD/S-76/13 - Tail Rotor Outboard Retaining Plate Bolts - Inspection","slug":"ad-s-76-13-tail-rotor-outboard-retaining-plate-bolts-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114502,"registerId":"commonwealth-F2006B06697-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/S-76/13 - Tail Rotor Outboard Retaining Plate Bolts - Inspection","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\n# AD/S-76/13 Tail Rotor Outboard Retaining Plate Bolts - Inspection\n\nApplicability: All models S-76 with S/Nos. SS 76005 to 76007, and SS 760001 to 760050. Document:               Sikorsky CSB 76-65-11.\n\nCompliance: Within 100 hours time in service after 30 September 1980.\n\n# 9/80\n\n \n\nBackground: The manufacturer has advised that the retention bolts may exhibit defects in the head to shank radius.\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":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1953},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This appears to be the original 1980 directive addressing a specific manufacturing defect identified by Sikorsky. There is no indication the scope has expanded beyond the original safety inspection requirement for the affected tail rotor retaining plate bolts."},"complexity_factors":["Single discrete compliance action required (visual inspection of specific bolts)","Narrow applicability limited to 53 specific aircraft serial numbers","No exceptions, conditional provisions, or alternative compliance methods","Minimal cross-referencing to external documents (only one manufacturer service bulletin cited)"],"plain_english_summary":"**What this does:** This is a mandatory safety order requiring inspection of specific bolts in the tail rotor assembly of certain Sikorsky S-76 helicopters.\n\n**Who it affects:** Owners and operators of S-76 helicopters with serial numbers SS 76005 through 76007, and SS 760001 through 760050.\n\n**What must be done:** Inspect the bolts on the tail rotor's outboard retaining plate within 100 hours of flying time after 30 September 1980.\n\n**Why it matters:** The manufacturer discovered these bolts could develop dangerous cracks where the bolt head meets the shaft (the \"head to shank radius\"). If these bolts fail, the tail rotor could detach, causing loss of control and potential crash. This directive forces operators to check for this defect before it causes catastrophic failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-76-13-tail-rotor-outboard-retaining-plate-bolts-inspection","history":"/api/acts/ad-s-76-13-tail-rotor-outboard-retaining-plate-bolts-inspection/history","analysis":"/api/acts/ad-s-76-13-tail-rotor-outboard-retaining-plate-bolts-inspection/analysis","conflicts":"/api/acts/ad-s-76-13-tail-rotor-outboard-retaining-plate-bolts-inspection/conflicts","importantCases":"/api/acts/ad-s-76-13-tail-rotor-outboard-retaining-plate-bolts-inspection/important-cases","documents":"/api/acts/ad-s-76-13-tail-rotor-outboard-retaining-plate-bolts-inspection/documents"}}