{"id":"F2006B04811","name":"AD/BO 105/8 - Tail Boom Skin","slug":"ad-bo-105-8-tail-boom-skin","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44603,"registerId":"commonwealth-F2006B04811-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BO 105/8 - Tail Boom Skin","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 105/8 Tail Boom Skin 3/87\n\nApplicability: All models.\n\n \n\nRequirement: Action in accordance with MBB BO 105 Alert Bulletin No 15 Revision 1. Compliance:               As detailed in the Requirement Document.\n\nBackground: Cracked tail boom skins have been found in service. LBA Directive 76-317/2 MBB refers.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD’s stated purpose is to address cracked tail boom skins on BO 105 helicopters and it does this by mandating actions in the manufacturer’s alert bulletin. The instrument applies to all BO 105 models and makes compliance contingent on the referenced Requirement Document; there is no indication in the text that the scope departs from that original safety-focused intent. (Applicability; Requirement; Background)"},"complexity_factors":["Directive is short and narrowly focused on a single component (tail boom skin). (Background; Applicability)","Mandatory action is by reference to an external technical document (MBB BO 105 Alert Bulletin No 15 Revision 1), so the AD omits procedural details. (Requirement; Compliance)","Applies to all models of the BO 105 series, broadening the population affected despite the single technical issue. (Applicability)","References an additional foreign authority directive (LBA Directive 76-317/2), adding a layer of cross-reference for technical context. (Background)","Unspecified cost, timing and methods in the AD increase implementation dependence on the content and clarity of the referenced bulletin. (Requirement; Compliance)"],"plain_english_summary":"This AD makes MBB’s BO 105 Alert Bulletin No.15 Revision 1 mandatory for all BO 105 series helicopters: operators must follow the bulletin’s inspection, repair or replacement actions to address discovered cracked tail‑boom skins. The Civil Aviation Safety Authority enforces compliance by reference, so owners/operators bear the cost, downtime and must obtain the manufacturer document to know exact procedures; the AD also cites related LBA Directive 76‑317/2."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific airworthiness issue (tail boom skin cracking) in a specific aircraft type. It has not expanded beyond its original purpose; it does exactly what Airworthiness Directives are designed to do — mandate corrective action for a known safety defect."},"complexity_factors":["Extremely short document (under 150 words of substantive content)","No defined terms section — relies entirely on external reference to manufacturer bulletin","Single, unambiguous applicability clause ('All models')","No conditional logic, exceptions, or nested provisions","Cross-reference to only one external document (MBB BO 105 Alert Bulletin No. 15 Rev 1)","Minimal legislative drafting — essentially a regulatory pointer to technical standards"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\nOrders owners and operators of **Eurocopter BO 105 series helicopters** to inspect and repair the **tail boom skin** (the outer metal covering of the helicopter's rear section) following specific instructions in a manufacturer bulletin.\n\n**Why it matters:**\nCracks have been discovered in the tail boom skins of these helicopters during normal use. The tail boom is critical for flight stability and control — if it fails, the helicopter could crash. This directive prevents accidents by forcing operators to check for and fix this known defect.\n\n**Who must comply:**\nAnyone operating any model of the Eurocopter BO 105 helicopter in Australia.\n\n**What must be done:**\nFollow the procedures in **MBB BO 105 Alert Bulletin No. 15 Revision 1** (the manufacturer's safety notice). The exact deadlines and methods are set out in that document, not repeated here."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bo-105-8-tail-boom-skin","history":"/api/acts/ad-bo-105-8-tail-boom-skin/history","analysis":"/api/acts/ad-bo-105-8-tail-boom-skin/analysis","conflicts":"/api/acts/ad-bo-105-8-tail-boom-skin/conflicts","importantCases":"/api/acts/ad-bo-105-8-tail-boom-skin/important-cases","documents":"/api/acts/ad-bo-105-8-tail-boom-skin/documents"}}