{"id":"F2006B04807","name":"AD/BO 105/4 - Dual Flight Controls","slug":"ad-bo-105-4-dual-flight-controls","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44595,"registerId":"commonwealth-F2006B04807-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BO 105/4 - Dual Flight Controls","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 105/4 Dual Flight Controls  7/86 DM\n\nApplicability: All model BO 105 helicopters with dual controls up to and including S/No 739. Requirement:              Action in accordance with MBB Alert Bulletin No. 27.\n\nCompliance: Before further flight after 1 July 1986.\n\n \n\nBackground: The possibility exists of collective controls becoming blocked.\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":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":887},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a targeted, time-limited safety directive addressing a specific mechanical defect (collective control blockage) in a defined aircraft series. It has not expanded beyond its original purpose of mandating an urgent safety fix."},"complexity_factors":["Extremely short length (only 3 operative paragraphs)","No defined terms or interpretation section","Single, clear compliance deadline","Only one external cross-reference (to manufacturer bulletin)","Simple applicability test (serial number cutoff)"],"plain_english_summary":"**What this does:**\nThis is a mandatory safety order (called an Airworthiness Directive) issued by the Civil Aviation Safety Authority (CASA) for specific Eurocopter BO 105 helicopters.\n\n**Who it affects:**\nOwners and operators of BO 105 helicopters with dual flight controls (serial numbers 739 and below).\n\n**What it requires:**\nBefore flying after 1 July 1986, operators must carry out specific repairs or inspections outlined in **MBB Alert Bulletin No. 27** (a manufacturer safety notice).\n\n**Why it matters:**\nThe helicopter's collective controls (the lever that changes the pitch of the rotor blades to make the aircraft climb or descend) could become jammed or blocked, creating a serious flight safety risk. This directive ensures the defect is fixed before the aircraft returns to service."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bo-105-4-dual-flight-controls","history":"/api/acts/ad-bo-105-4-dual-flight-controls/history","analysis":"/api/acts/ad-bo-105-4-dual-flight-controls/analysis","conflicts":"/api/acts/ad-bo-105-4-dual-flight-controls/conflicts","importantCases":"/api/acts/ad-bo-105-4-dual-flight-controls/important-cases","documents":"/api/acts/ad-bo-105-4-dual-flight-controls/documents"}}