{"id":"F2006B04800","name":"AD/BO 105/11 Amdt 1 - Tail Rotor Transmission","slug":"ad-bo-105-11-amdt-1-tail-rotor-transmission","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44588,"registerId":"commonwealth-F2006B04800-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BO 105/11 Amdt 1 - Tail Rotor Transmission","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 BO 105 Series Helicopters\n\n \n\nAD/BO 105/11\n\nAmdt 1\n\n\nTail Rotor Transmission  13/87 DM\n\n \n\nApplicability: All model BO 105 helicopters fitted with tail rotor transmission P/N 4619003003 and with S/No as listed in Requirement document.\n\n \n\nRequirement: Action in accordance with MBB Alert Service Bulletin No ASB-BO 105-30-101 Rev 1.\n\n \n\nCompliance: Within 50 hours time in service after 30 October 1987 and upon installation of affected transmissions on an aircraft after 30 October 1987.\n\n \n\nBackground:  The tail rotor gearbox mounting bracket may be distorted by a raised projection on the transmission housing which may lead to cracking of the transmission mount.\n\nRevision 1 to the SB increases the applicable S/N range.\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":1493},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This amendment expands the scope of affected aircraft by increasing the applicable serial number range of the tail rotor transmissions covered by the directive."},"complexity_factors":["Short, single-purpose directive with four standard sections","Single external technical reference (Service Bulletin)","Specific part number and serial number applicability","Simple time-based compliance trigger (50 hours time in service)"],"plain_english_summary":"This directive requires owners/operators of Eurocopter BO 105 helicopters fitted with tail rotor transmission P/N 4619003003 (specified serial numbers) to follow the inspection and maintenance steps in MBB Alert Service Bulletin ASB-BO 105-30-101 Rev. 1 to prevent tail rotor gearbox mounting-bracket distortion and cracking from a manufacturing projection.\n\nCompliance is required within 50 flight hours after 30 Oct 1987 and whenever an affected transmission is installed; this amendment widens the list of affected serial numbers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bo-105-11-amdt-1-tail-rotor-transmission","history":"/api/acts/ad-bo-105-11-amdt-1-tail-rotor-transmission/history","analysis":"/api/acts/ad-bo-105-11-amdt-1-tail-rotor-transmission/analysis","conflicts":"/api/acts/ad-bo-105-11-amdt-1-tail-rotor-transmission/conflicts","importantCases":"/api/acts/ad-bo-105-11-amdt-1-tail-rotor-transmission/important-cases","documents":"/api/acts/ad-bo-105-11-amdt-1-tail-rotor-transmission/documents"}}