{"id":"F2007L02679","name":"AD/BO 105/18 - Tail Rotor Blade End Caps","slug":"ad-bo-105-18-tail-rotor-blade-end-caps","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":68560,"registerId":"commonwealth-F2007L02679-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter BO 105 Series Helicopters","sectionType":"division","heading":"Eurocopter BO 105 Series Helicopters","content":"### Eurocopter BO 105 Series Helicopters\n\n| AD/BO 105/18 | Tail Rotor Blade End Caps | 10/2007 |\n| ------------ | ------------------------- | ------- |\n\n| Applicability: | All Messerschmitt-Bolkow Blohm (MBB) Model BO 105 helicopters, equipped with tail rotor blade part number 105-31742 with blade serial numbers up to and including serial number 548; and all spare part number 105-31742 blades with serial numbers up to and including serial number 548. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Action in accordance with the requirements of LBA AD 74-162.Note: MBB Service Bulletin No. 30-8 refers.                                                                                                                                                                                    |\n| Compliance:    | As specified in the Requirement document.                                                                                                                                                                                                                                                  |\n|                | This Airworthiness Directive becomes effective on 27 September 2007.                                                                                                                                                                                                                       |\n| Background:    | A fibreglass plastic loop which has been installed on tail rotor blades in accordance with LTA-Nr.74-64 (MBB Service Bulletin No. 30-5) has shown deficiencies during operation.                                                                                                           |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n13 August 2007","sortOrder":0},{"sectionNumber":"AD/BO 105/18","sectionType":"part","heading":"AD/BO 105/18","content":"## AD/BO 105/18","sortOrder":1},{"sectionNumber":"Tail Rotor Blade End Caps","sectionType":"part","heading":"Tail Rotor Blade End Caps","content":"## Tail Rotor Blade End Caps","sortOrder":2},{"sectionNumber":"10/2007","sectionType":"part","heading":"10/2007","content":"## 10/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive confines action to BO 105 helicopters and spare blades with part number 105-31742 up to serial 548 and requires the remedial work specified in LBA AD 74-162. There is no text in this instrument indicating an expansion or narrowing of that population beyond those limits."},"complexity_factors":["Dependency on an external corrective document (LBA AD 74-162) and a service bulletin (MBB SB No. 30-8) for the substantive technical requirements","Narrow applicability tied to a single part number and a specific serial-number cutoff (up to and including serial 548), including spare parts","Reference to a prior modification (fibreglass loop installed under LTA-Nr.74-64 / SB No.30-5) as the root cause, which requires operators to trace modification history","Compliance timing is set by the AD effective date (27 September 2007) but the AD defers procedural detail to the referenced documents, creating implementation reliance","Regulatory enforcement by CASA with costs and operational downtime borne by aircraft owners/operators"],"plain_english_summary":"This Airworthiness Directive requires operators and owners of MBB (Eurocopter) BO 105 helicopters fitted with tail rotor blade part number 105-31742 (blade serial numbers up to and including 548), and holders of spare blades with those serials, to carry out the corrective action set out in LBA AD 74-162 (see MBB Service Bulletin No. 30-8). It responds to detected deficiencies in a fibreglass loop end cap and became effective 27 September 2007. Operators bear the cost of inspection/repair; the regulator mandates compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific mechanical defect in a specific helicopter model. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 200 words of substantive text)","Only 2 defined elements: specific part number (105-31742) and serial number cutoff (548)","Single requirement referencing external document (LBA AD 74-162) rather than spelling out technical steps","No nested conditions, exceptions, or cross-references to other Australian legislation","Straightforward applicability test based on equipment serial numbers"],"plain_english_summary":"This CASA Airworthiness Directive mandates corrective action on tail rotor blade end caps of Eurocopter MBB BO 105 helicopters—specifically blades P/N 105-31742, S/N 548 and below, including spares—after failure of a fibreglass loop that can degrade tail-rotor performance and directional control.  \n\nAffected operators must comply with German LBA AD 74-162 (per MBB Service Bulletin No. 30-8). The AD is effective 27 September 2007."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bo-105-18-tail-rotor-blade-end-caps","history":"/api/acts/ad-bo-105-18-tail-rotor-blade-end-caps/history","analysis":"/api/acts/ad-bo-105-18-tail-rotor-blade-end-caps/analysis","conflicts":"/api/acts/ad-bo-105-18-tail-rotor-blade-end-caps/conflicts","importantCases":"/api/acts/ad-bo-105-18-tail-rotor-blade-end-caps/important-cases","documents":"/api/acts/ad-bo-105-18-tail-rotor-blade-end-caps/documents"}}