{"id":"F2006B08734","name":"AD/DAUPHIN/23 - Tail Rotor Gearbox Mounting Tripod Internal Surfaces","slug":"ad-dauphin-23-tail-rotor-gearbox-mounting-tripod-internal-surfaces","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51968,"registerId":"commonwealth-F2006B08734-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DAUPHIN/23 - Tail Rotor Gearbox Mounting Tripod Internal Surfaces","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)  Eurocopter SA 360 and SA 365 (Dauphin) Series Helicopters\n\n \n\n# AD/DAUPHIN/23 Tail Rotor Gearbox Mounting Tripod Internal Surfaces\n\nApplicability: All models SA 360C, SA 361, SA 365C - C1 - C2 -C3 Helicopters. Requirement:  Action in accordance with Aerospatiale Mandatory SB 01.23.\n\n# 4/89\n\nCompliance: (a) For tripods which have been installed on an aircraft for 24 months or more - before 30 June 1989, or\n\n \n\n(b)     For tripods which have been installed on an aircraft for less than 24 months - when 30 months Time in Service is reached after installation, and\n\n \n\n(c)      Thereafter at intervals not exceeding 2 400 Hours Time in Service or whenever the tripod is removed for unscheduled maintenance.\n\n \n\n(d)     For spare tripods - In accordance with the Requirement Document.\n\n \n\nBackground: To ensure tripod internal surfaces are in a serviceable condition and to carry out corrosion protective treatment after inspection.\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":2108},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow technical scope focused specifically on corrosion inspection and protective treatment of tail rotor gearbox mounting tripods for the specified Dauphin helicopter models. It has not expanded beyond this specific airworthiness maintenance requirement into broader operational or certification domains."},"complexity_factors":["Single-page directive with minimal text and no defined terms section","Limited applicability restricted to six specific helicopter model variants","Simple conditional compliance dates based solely on installation duration (24-month threshold)","Single external reference to manufacturer Service Bulletin 01.23 with no nested cross-references to other legislative instruments","Clear unambiguous background statement specifying safety purpose"],"plain_english_summary":"This mandatory directive requires owners/operators of Eurocopter/Aerospatiale Dauphin helicopters (SA 360C, SA 361, SA 365C/C1/C2/C3) to inspect the internal surfaces of the tail-rotor gearbox mounting tripod per Aerospatiale Mandatory Service Bulletin 01.23 and apply a corrosion-protective treatment.\n\nDeadlines depend on time-in-service with repeat inspections every 2,400 flight hours (and after unscheduled removals); the work prevents corrosion that could weaken the tripod and risk loss of tail-rotor directional control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dauphin-23-tail-rotor-gearbox-mounting-tripod-internal-surfaces","history":"/api/acts/ad-dauphin-23-tail-rotor-gearbox-mounting-tripod-internal-surfaces/history","analysis":"/api/acts/ad-dauphin-23-tail-rotor-gearbox-mounting-tripod-internal-surfaces/analysis","conflicts":"/api/acts/ad-dauphin-23-tail-rotor-gearbox-mounting-tripod-internal-surfaces/conflicts","importantCases":"/api/acts/ad-dauphin-23-tail-rotor-gearbox-mounting-tripod-internal-surfaces/important-cases","documents":"/api/acts/ad-dauphin-23-tail-rotor-gearbox-mounting-tripod-internal-surfaces/documents"}}