{"id":"F2006B04805","name":"AD/BO 105/2 Amdt 1 - Tail Rotor Blade Grips","slug":"ad-bo-105-2-amdt-1-tail-rotor-blade-grips","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44593,"registerId":"commonwealth-F2006B04805-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BO 105/2 Amdt 1 - Tail Rotor Blade Grips","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nEurocopter BO 105 Series Helicopters\n\nAD/BO 105/2\n\nAmdt 1\n\n  \nTail Rotor Blade Grips 2/87\n\nApplicability: All Models fitted with tail rotor blade grips P/N 105-31711 and 105-31722.\n\nRequirement: 1. Inspect the clevis area of each grip in accordance with BO 105 Alert Bulletin No 18.\n\n    2. Inspect the inboard end of each grip in accordance with BO 105 SB No 30-24.\n\n    3. Inspect each grip in and around the hole for the laminated-pack retaining bolt in accordance with BO 105 SB No 30-24.\n\nCompliance: For Para’s 1 and 2 \\- At each 100 hour inspection of the tail rotor.\n\nFor Para 3 \\- At each 600 hour inspection of the tail rotor.\n\nBackground: Cracks in the tail rotor blade grips have been found in service. This Directive addresses the requirements of MBB BO 105 Alert Bulletin 18 and Service Bulletin No 30-24, and LBA Directives 78-339 MBB and 79-144 MBB.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is an amendment (Amdt 1) to an existing Airworthiness Directive, but the scope remains tightly focused on its original purpose: ensuring safety of BO 105 tail rotor blade grips. The document shows no evidence of scope creep — it addresses the specific safety issue (cracks in specific part numbers) identified in the background section without expanding to unrelated systems or aircraft types."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined part numbers for applicability","Three straightforward inspection requirements with clear references to external manufacturer documents","Simple compliance schedule with only two time intervals (100 hours and 600 hours)","No nested conditions, exceptions, or cross-references to other legislation","Single purpose: mandating specific inspections for a defined aircraft component"],"plain_english_summary":"This is a **safety directive for helicopter operators** that mandates specific inspections of tail rotor blade grips on Eurocopter BO 105 series helicopters.\n\n**What it does:**\n- Requires operators to inspect three specific areas of the tail rotor blade grips (identified by part numbers 105-31711 and 105-31722) for cracks:\n  1. The **clevis area** (the forked joint that connects parts) — following Alert Bulletin No 18\n  2. The **inboard end** of each grip — following Service Bulletin No 30-24\n  3. The area **around the retaining bolt hole** — also following Service Bulletin No 30-24\n\n**Who it affects:**\n- Owners and operators of all Eurocopter BO 105 helicopter models fitted with the specific tail rotor blade grip part numbers listed above.\n\n**Why it matters:**\n- **Safety critical:** Cracks have been discovered in these components during actual service use. The tail rotor is essential for helicopter control and stability — failure could be catastrophic.\n- **Mandatory compliance:** These inspections are legally required at set intervals (every 100 hours or 600 hours of flight time on the tail rotor, depending on which inspection).\n- **Traceability:** The directive references manufacturer bulletins and German aviation authority directives (LBA), ensuring the requirements align with international safety standards.\n\n**Key terms explained:**\n- **Airworthiness Directive (AD):** A legally enforceable safety notice issued by aviation authorities requiring specific maintenance actions.\n- **Service Bulletin (SB):** Manufacturer-issued instructions for maintenance or modifications.\n- **P/N:** Part Number — the manufacturer's identifier for a specific component."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This instrument is labeled Amendment 1 to AD/BO 105/2 and, as published, prescribes mandatory inspections of the specified tail rotor blade grips and fixes their inspection intervals (100‑hour for paras 1 and 2; 600‑hour for para 3). The amendment makes the inspections required to be carried out \"in accordance with\" the referenced Alert Bulletin and Service Bulletin and implements the measures identified in those manufacturer/authority documents and the cited LBA directives (Background, Requirement, Compliance). The text itself does not set out how these inspections differ from the original AD text, only that this is Amendment 1 and that the listed inspection requirements and intervals apply."},"complexity_factors":["Narrow applicability tied to specific part numbers (P/N 105-31711 and 105-31722) (Applicability)","Multiple distinct inspections with different recurrence intervals (100‑hour and 600‑hour) requiring coordination with existing maintenance schedules (Requirement, Compliance)","Procedural details are delegated to external documents (BO 105 Alert Bulletin No 18 and Service Bulletin No 30-24), requiring operators to obtain and interpret additional materials (Requirement)","Technical nature of inspections (clevis area, inboard end, laminated-pack retaining bolt hole) requires qualified maintenance personnel and possible follow-up maintenance if defects are found (Requirement, Background)","Legal form as an airworthiness directive under Civil Aviation Regulations Part 39 gives it mandatory force and ties compliance to regulated maintenance regimes (header)"],"plain_english_summary":"This Airworthiness Directive requires operators of BO 105 helicopters fitted with tail‑rotor blade grips P/N 105‑31711 or 105‑31722 to carry out three specified grip inspections, at recurring 100‑hour and 600‑hour tail‑rotor intervals, following the procedures in the referenced MBB Alert and Service Bulletins. It increases recurring maintenance workload and costs for operators, who must perform the inspections and any follow‑on repairs identified."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bo-105-2-amdt-1-tail-rotor-blade-grips","history":"/api/acts/ad-bo-105-2-amdt-1-tail-rotor-blade-grips/history","analysis":"/api/acts/ad-bo-105-2-amdt-1-tail-rotor-blade-grips/analysis","conflicts":"/api/acts/ad-bo-105-2-amdt-1-tail-rotor-blade-grips/conflicts","importantCases":"/api/acts/ad-bo-105-2-amdt-1-tail-rotor-blade-grips/important-cases","documents":"/api/acts/ad-bo-105-2-amdt-1-tail-rotor-blade-grips/documents"}}