{"id":"F2007L02678","name":"AD/BO 105/19 - Tail Rotor Blade Grips","slug":"ad-bo-105-19-tail-rotor-blade-grips","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":68556,"registerId":"commonwealth-F2007L02678-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 105/19 | Tail Rotor Blade Grips | 10/2007 |\n| ------------ | ---------------------- | ------- |\n\n| Applicability: | All Messerschmitt-Bolkow Blohm (MBB) Model BO 105 helicopters, equipped with tail rotor blade grips part number 105-31711 and 105-31722. |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the requirements of LBA AD 78-339.Note: MBB BO 105 Service Bulletin No. 30-24 refers.                          |\n| Compliance:    | As specified in the Requirement document.                                                                                                |\n|                | This Airworthiness Directive becomes effective on 27 September 2007.                                                                     |\n| Background:    | The LBA requires inspections of tail rotor blade grip inboard ends for cracking.                                                         |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n13 August 2007","sortOrder":0},{"sectionNumber":"AD/BO 105/19","sectionType":"part","heading":"AD/BO 105/19","content":"## AD/BO 105/19","sortOrder":1},{"sectionNumber":"Tail Rotor Blade Grips","sectionType":"part","heading":"Tail Rotor Blade Grips","content":"## Tail Rotor Blade Grips","sortOrder":2},{"sectionNumber":"10/2007","sectionType":"part","heading":"10/2007","content":"## 10/2007","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive targeting a specific safety issue (cracking in specific tail rotor components) on a specific helicopter model. The scope remains tightly focused on the original safety concern without expansion into broader operational or maintenance requirements."},"complexity_factors":["Very short document (under 200 words)","Only 2 specific part numbers identified","Single requirement: comply with external document (LBA AD 78-339)","No defined terms section","No nested conditions or exceptions","Cross-reference to only one external technical document plus one service bulletin"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections of the inboard ends of tail rotor blade grips (parts 105‑31711 and 105‑31722) on MBB BO 105 helicopters, following LBA AD 78‑339 and MBB Service Bulletin No. 30‑24. \n\nIt affects owners, operators and maintainers; cracks can cause catastrophic tail‑rotor failure, and compliance is legally required. Effective 27 September 2007."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive implements inspection requirements described by the LBA and references the MBB service bulletin. It limits application to BO 105 helicopters with P/N 105‑31711 or 105‑31722 tail rotor blade grips and does not expand or narrow those requirements within the text provided."},"complexity_factors":["Narrow technical scope: applies only to BO 105 helicopters with specific tail‑rotor grip part numbers (Applicability).","Cross‑reference to an overseas regulator's AD (LBA AD 78‑339) rather than containing full inspection procedures (Requirement).","Reliance on a manufacturer service bulletin for technical detail (MBB Service Bulletin No. 30‑24 noted).","Compliance timing and actions are delegated to the referenced documents rather than restated here ('as specified in the Requirement document'), creating dependency on external documents.","Regulatory layering: CASA enforces an LBA requirement (delegate signature and effective date present), so operators must translate foreign AD requirements into local compliance.","Operational impact: inspections for cracking may require downtime, parts replacement, and record keeping (Background; Compliance)."],"plain_english_summary":"Requires operators of Messerschmitt‑Bolkow‑Blohm (MBB) BO 105 helicopters fitted with tail rotor blade grips P/N 105‑31711 or 105‑31722 to inspect the inboard ends of those grips for cracking, by complying with the LBA Airworthiness Directive 78‑339 and the referenced MBB Service Bulletin No. 30‑24. CASA made the directive effective 27 September 2007, so operators must carry out inspections and any corrective work per the referenced documents; the operator bears the compliance costs and scheduling impact."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bo-105-19-tail-rotor-blade-grips","history":"/api/acts/ad-bo-105-19-tail-rotor-blade-grips/history","analysis":"/api/acts/ad-bo-105-19-tail-rotor-blade-grips/analysis","conflicts":"/api/acts/ad-bo-105-19-tail-rotor-blade-grips/conflicts","importantCases":"/api/acts/ad-bo-105-19-tail-rotor-blade-grips/important-cases","documents":"/api/acts/ad-bo-105-19-tail-rotor-blade-grips/documents"}}