{"id":"F2006L02485","name":"AD/DAUPHIN/81 Amdt 2 - Tail Rotor Blade Sleeve","slug":"ad-dauphin-81-amdt-2-tail-rotor-blade-sleeve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":59675,"registerId":"commonwealth-F2006L02485-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter SA 360 and SA 365 (Dauphin) S","sectionType":"division","heading":"Eurocopter SA 360 and SA 365 (Dauphin) Series Helicopters","content":"### Eurocopter SA 360 and SA 365 (Dauphin) Series Helicopters\n\n| AD/DAUPHIN/81 Amdt 2 | Tail Rotor Blade Sleeve | 9/2006 |\n| -------------------- | ----------------------- | ------ |\n\n| Applicability: | Models SA 365 N1 and AS 365 N2, N3 helicopters, equipped with tail rotor blades part number 365A12-0060-01 or 365A12-0070-00.                                                                                                                                                                                                                                                                                                                                                       |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Check the stainless steel ring on the sleeve of each tail rotor blade in accordance with paragraph 2.B.1. of Eurocopter AS 365 Alert Service Bulletin No. 05.00.49, or later EASA approved revision.If the stainless steel ring has moved, before further flight, replace the affected tail rotor blade.Note: EASA AD 2006-0099 refers.                                                                                                                                             |\n| Compliance:    | Within 15 flight hours after 10 August 2005. Thereafter at intervals not to exceed 10 flight hours.The initial compliance time remains unchanged by this issue.                                                                                                                                                                                                                                                                                                                     |\n|                | This Amendment becomes effective on 31 August 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| Background:    | The DGAC received a report of a case of separation and loss of the stainless steel ring from a tail rotor blade sleeve, which resulted in high vibration. Such vibration could lead to damage to the Fenestron rotor blades and loss of yaw control.Amendment 1 clarified the repeat inspection compliance statement.Amendment 2 is issued in response to a new EASA AD, which changes the daily inspection interval for compatibility with the scheduled daily / 10-hr inspection. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n20 July 2006","sortOrder":0},{"sectionNumber":"AD/DAUPHIN/81 Amdt 2","sectionType":"part","heading":"AD/DAUPHIN/81 Amdt 2","content":"## AD/DAUPHIN/81 Amdt 2","sortOrder":1},{"sectionNumber":"Tail Rotor Blade Sleeve","sectionType":"part","heading":"Tail Rotor Blade Sleeve","content":"## Tail Rotor Blade Sleeve","sortOrder":2},{"sectionNumber":"9/2006","sectionType":"part","heading":"9/2006","content":"## 9/2006","sortOrder":3}],"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":3,"scope_assessment":{"changed":true,"description":"Amendment 2 does not expand the set of affected aircraft or parts but modifies the inspection timing to align the daily inspection interval with the scheduled daily/10‑hour inspection. The initial compliance requirement remains unchanged (Background; Compliance)."},"complexity_factors":["Narrow technical applicability to specific helicopter models and two blade part‑numbers (Applicability).","Action is simple (inspect and replace if ring has moved) but requires frequent repetition (initial within 15 flight hours, then every 10 flight hours) (Requirement; Compliance).","Dependence on an external manufacturer Alert Service Bulletin and possible later EASA‑approved revisions for inspection instructions (Requirement).","Immediate operational impact if a defect is found (replacement before further flight) — imposes direct consumable/maintenance cost on operators (Requirement).","Regulatory linkage: references and alignment with an EASA AD and prior Amendments, creating version‑management and compliance‑tracking needs (Background).","Effective date and retrospective initial compliance timing require operators to reconcile past scheduling (Compliance; Effective date)"],"plain_english_summary":"Requires operators of Eurocopter SA 365 N1 and AS 365 N2/N3 helicopters fitted with tail rotor blades P/N 365A12-0060-01 or 365A12-0070-00 to inspect the stainless-steel ring on each tail rotor blade sleeve per the Eurocopter AS 365 Alert Service Bulletin. If the ring has moved, the affected blade must be replaced before further flight. Initial and repeat inspection times are prescribed (initial within 15 flight hours after 10 Aug 2005; thereafter every 10 flight hours). The stated purpose is to prevent vibration that could damage Fenestron blades and impair yaw control."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of addressing the tail rotor blade sleeve safety issue. Amendment 2 is a minor administrative update that adjusts inspection intervals for operational compatibility without expanding the substantive requirements or applicability."},"complexity_factors":["Single, specific mechanical component addressed (stainless steel ring on tail rotor blade sleeve)","Clear applicability criteria limited to two specific helicopter models and two part numbers","Straightforward compliance requirement: inspect per referenced service bulletin, replace if moved","Simple time-based compliance schedule (15 hours initially, then every 10 hours)","No nested exceptions, conditional logic, or extensive cross-referencing beyond one service bulletin and one EASA AD reference","Short document with minimal defined terms"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of Eurocopter Dauphin SA 365 N1 / AS 365 N2 / N3 helicopters to inspect the stainless-steel ring on each tail-rotor blade sleeve and to replace any blade if the ring has moved. Inspections begin within 15 flight hours after 10 Aug 2005 and recur every 10 flight hours. It responds to an in-flight ring loss that caused severe vibration and possible loss of yaw control; Amendment 2 aligns the interval with daily/10‑hour maintenance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dauphin-81-amdt-2-tail-rotor-blade-sleeve","history":"/api/acts/ad-dauphin-81-amdt-2-tail-rotor-blade-sleeve/history","analysis":"/api/acts/ad-dauphin-81-amdt-2-tail-rotor-blade-sleeve/analysis","conflicts":"/api/acts/ad-dauphin-81-amdt-2-tail-rotor-blade-sleeve/conflicts","importantCases":"/api/acts/ad-dauphin-81-amdt-2-tail-rotor-blade-sleeve/important-cases","documents":"/api/acts/ad-dauphin-81-amdt-2-tail-rotor-blade-sleeve/documents"}}