{"id":"F2006B08724","name":"AD/DAUPHIN/11 Amdt 2 - Main Rotor Mast","slug":"ad-dauphin-11-amdt-2-main-rotor-mast","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51945,"registerId":"commonwealth-F2006B08724-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DAUPHIN/11 Amdt 2 - Main Rotor Mast","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 SA 360 and SA 365 (Dauphin) Series Helicopters\n\nAD/DAUPHIN/11\n\nAmdt 2\n\n  \nMain Rotor Mast 2/90\n\nApplicability: All model 365 series equipped with main rotor mast part number 365A31.1060.21, 22, 24 or 26.\n\nRequirement: 1. Inspect and rework in accordance with Para 1C of Aerospatiale Dauphin Service Bulletin 05.08 Rev 2.\n\n    2. Visually inspect for assembly damage in accordance with Para 1C(3)(c)(ca) of SB\n\n05.08 Rev 2.\n\n    3. Visually inspect (without disassembly) for scores, corrosion or tool marks in the fillet radius underneath the top flange (Zone 2 of Figure 1 of the SB) and rework as necessary, in accordance with Paras 1C(2)(aa), 1C(2)(ac) and 1C(3)(aa) of SB\n\n05.08 Rev 2.\n\nNote: Bureau Veritas AD 84-019-021(B)R2 refers.\n\nCompliance: 1. Before exceeding 300 hours time in service or within the next 50 hours time in service after 22 September 1986, whichever is the later, and thereafter at intervals not exceeding 400 hours time in service. In addition, inspect immediately following the occurrence of a sudden or repeated severe tracking defect.\n\n    2. After performing any work on the bolts or nuts which attach the MRH to the rotor mast.\n\n    3. Within the next 50 hours time in service or 2 months after 22 September 1986, whichever occurs first, and thereafter at intervals not exceeding 50 hours time in service or 2 months, whichever occurs first.\n\nBackground: The manufacturer advises the need to inspect the mast for corrosion pits, tool marks and fretting to preclude the possibility of fatigue cracking. This Directive has been amended to include additional inspections. This Amendment further extends the 300 hourly inspection to 400 hours to align with Revision 2 of the SB.","sortOrder":0}],"analysis":{"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"},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"The Amendment added additional inspections and extended the prior 300‑hour recurring inspection to 400 hours to align with Aerospatiale SB 05.08 Rev 2; this alters inspection frequency and coverage compared with the earlier AD (Background)."},"complexity_factors":["Targeted applicability to specific part numbers increases tracking and compliance burden (Applicability).","Multiple, overlapping inspection requirements with different intervals (Compliance: items 1–3).","Event‑triggered inspections (after sudden/repeated tracking defects and after bolt/nut work) create unpredictable maintenance timing (Compliance: items 1 & 2).","Mandated rework and inspection methods reference an external Service Bulletin (Aerospatiale SB 05.08 Rev 2) requiring operators to obtain and follow technical procedures not reproduced in the AD (Requirement: Para 1C of SB 05.08 Rev 2).","Some inspections are non‑disassembly visual checks of a specific zone (fillet radius under top flange, Zone 2), demanding access and trained inspection judgment (Requirement: Para 1C(2)(aa), 1C(3)(aa); Figure 1 of SB).","Cross‑references to other authority documents (Bureau Veritas AD) add documentary complexity and version control risk (Note).","Amendment history changed inspection frequency (Background), requiring operators to track regulatory amendments and SB revisions for compliance alignment."],"plain_english_summary":"Mandates inspections and corrective rework of the main rotor mast on Eurocopter SA 365 helicopters fitted with specified mast part numbers, using Aerospatiale Service Bulletin 05.08 Rev 2 procedures. Operators must perform initial and recurring visual inspections at specified flight‑hour or calendar intervals and after events (for example, sudden tracking defects or work on MRH bolts/nuts); operators bear the compliance cost and must repair defects to prevent fatigue cracking, per the manufacturer's advice."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD remains focused on its original purpose: ensuring the airworthiness of main rotor masts on specific Dauphin helicopter models. Amendment 2 makes only minor adjustments to inspection intervals (extending 300 hours to 400 hours) to align with updated manufacturer guidance. The scope has not expanded beyond the original safety concern."},"complexity_factors":["Multiple compliance deadlines with 'whichever is later/first' conditional logic","Three distinct inspection requirements with different intervals (400 hours vs 50 hours/2 months)","Cross-reference to external manufacturer document (Service Bulletin 05.08 Rev 2) — operators must obtain and understand this separate technical document","Specific part number applicability filtering (4 specific part numbers listed)","Trigger-based compliance (\"immediately following\" sudden tracking defects)","Nested paragraph references (e.g., 'Para 1C(3)(c)(ca)') requiring navigation of hierarchical technical document"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections and repairs of the main rotor mast on certain Eurocopter Dauphin (SA 360/365) helicopters, following the manufacturer’s service instructions. It requires checks after any work on hub-to-mast fasteners and for corrosion, scratches or tool marks that could lead to fatigue cracking. It affects owners, operators and maintainers and aims to prevent catastrophic rotor failure by ensuring timely maintenance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dauphin-11-amdt-2-main-rotor-mast","history":"/api/acts/ad-dauphin-11-amdt-2-main-rotor-mast/history","analysis":"/api/acts/ad-dauphin-11-amdt-2-main-rotor-mast/analysis","conflicts":"/api/acts/ad-dauphin-11-amdt-2-main-rotor-mast/conflicts","importantCases":"/api/acts/ad-dauphin-11-amdt-2-main-rotor-mast/important-cases","documents":"/api/acts/ad-dauphin-11-amdt-2-main-rotor-mast/documents"}}