{"id":"F2006B06724","name":"AD/S-76/43 - Tail Rotor Servo Actuator Linkage","slug":"ad-s-76-43-tail-rotor-servo-actuator-linkage","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114548,"registerId":"commonwealth-F2006B06724-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/S-76/43 - Tail Rotor Servo Actuator Linkage","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-76/43 Tail Rotor Servo Actuator Linkage 10/86\n\nApplicability: All model S-76A Helicopters.\n\n \n\nRequirement: Inspect and modify in accordance with Sikorsky S76 Alert Service Bulletin No. 76- 67-24 and HR Textron Service Bulletin No. SB272.\n\n \n\nCompliance: Inspect - within 25 hours time in service after 31 October 1986 and thereafter at intervals not exceeding 25 hours time in service until modification is carried out.\n\n \n\nModify - prior to 31 November 1986.\n\n \n\nBackground:  The Manufacturer has received reports which indicate possible bolt misalignment on the servo actuator input crank assembly, causing fretting of the bolt.\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":1554},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope addressing the specific mechanical defect in the tail rotor servo actuator linkage of S-76A helicopters."},"complexity_factors":["Single, clearly identified aircraft model (S-76A) with no exceptions","No nested conditional logic or subsections","Relies on external technical documents (service bulletins) rather than embedding complex technical specifications","Brief, single-issue scope with straightforward compliance deadlines"],"plain_english_summary":"This is a mandatory safety order (called an **Airworthiness Directive**) for owners and operators of Sikorsky S-76A helicopters.\n\n**What it fixes:** The manufacturer discovered that bolts in the tail rotor servo actuator linkage (a critical component that helps steer the helicopter) could become misaligned. This causes \"fretting\" (wear from rubbing) that could potentially lead to control problems or failure.\n\n**What operators must do:**\n* **Inspect:** Check the affected bolt assembly every 25 hours of flight time, starting by October 31, 1986, and continue these checks every 25 hours until the modification is done\n* **Modify:** Install the permanent fix described in two manufacturer service bulletins (Sikorsky Alert Service Bulletin No. 76-67-24 and HR Textron Service Bulletin No. SB272) before November 31, 1986\n\nThis directive ensures the tail rotor system operates safely and prevents mechanical failure during flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-76-43-tail-rotor-servo-actuator-linkage","history":"/api/acts/ad-s-76-43-tail-rotor-servo-actuator-linkage/history","analysis":"/api/acts/ad-s-76-43-tail-rotor-servo-actuator-linkage/analysis","conflicts":"/api/acts/ad-s-76-43-tail-rotor-servo-actuator-linkage/conflicts","importantCases":"/api/acts/ad-s-76-43-tail-rotor-servo-actuator-linkage/important-cases","documents":"/api/acts/ad-s-76-43-tail-rotor-servo-actuator-linkage/documents"}}