{"id":"F2006B09335","name":"AD/ECUREUIL/22 Amdt 6 - Tail Rotor Blade Assembly","slug":"ad-ecureuil-22-amdt-6-tail-rotor-blade-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53525,"registerId":"commonwealth-F2006B09335-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ECUREUIL/22 Amdt 6 - Tail Rotor Blade Assembly","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 AS 350 (Ecureuil) Series Helicopters\n\nAD/ECUREUIL/22\n\nAmdt 6\n\n  \nTail Rotor Blade Assembly 5/94\n\nApplicability: All models fitted with all dash numbers of tailrotor blades P/N 350A08-1011, 350A12-0020, 350A12-0030, 355A12-0031, and 355A12-0040.\n\nRequirement: Action in accordance with Eurocopter AS 350 SB No. 05-11 Revision 5.\n\nNote: DGAC AD 84-064-037(B)R3 refers.\n\nCompliance: As specified in the requirement document.\n\nThis Directive must be entered onto the Maintenance Release as maintenance required. Paragraph C1 of the Requirement document may be performed by the pilot in command, in which case a certification is to be made by entering AD/ECUREUIL/22 Amdt 6 against the Daily Inspection certification on the Maintenance Release. A copy of this Directive and of the requirement document must be carried in the aircraft.\n\nBackground: This Directive was initially raised following reports of cracking, leading to severe unbalance, at the blade root on the tail rotor spar.\n\nAmendment 4 extended the part number applicability.\n\nAmendment 5 specified what part of the inspection may be certified by the pilot in command.\n\nAmendment 6 is issued in response to revision 5 of the requirement document which clarifies compliance conditions.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1884},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive remains strictly focused on the original safety issue of tail rotor blade root cracking identified in the initial 1994 issue. While Amendment 4 expanded part number applicability and Amendment 6 updated compliance conditions to match the manufacturer's Revision 5, these represent technical refinements and clarifications within the original safety scope rather than expansion into new regulatory areas or aircraft systems."},"complexity_factors":["Incorporates external technical document (Eurocopter Service Bulletin 05-11 Rev 5) by reference without reproducing its content","Five specific part numbers with 'all dash numbers' applicability creating multiple sub-variants","Dual certification pathways distinguishing between pilot-performed daily inspections and licensed maintainer requirements","Mandatory physical carriage of documents creates operational compliance burden"],"plain_english_summary":"This directive requires mandatory inspections of Eurocopter AS350 tail rotor blades (specific P/Ns listed in the text) per Service Bulletin No. 05-11 Revision 5 to detect root cracking that can cause severe vibration and loss of control. Operators must log inspections in the Maintenance Release and carry copies of the Directive and Service Bulletin onboard. Pilots may perform daily visual checks as allowed by the bulletin, but full compliance requires a licensed aircraft maintenance engineer."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ecureuil-22-amdt-6-tail-rotor-blade-assembly","history":"/api/acts/ad-ecureuil-22-amdt-6-tail-rotor-blade-assembly/history","analysis":"/api/acts/ad-ecureuil-22-amdt-6-tail-rotor-blade-assembly/analysis","conflicts":"/api/acts/ad-ecureuil-22-amdt-6-tail-rotor-blade-assembly/conflicts","importantCases":"/api/acts/ad-ecureuil-22-amdt-6-tail-rotor-blade-assembly/important-cases","documents":"/api/acts/ad-ecureuil-22-amdt-6-tail-rotor-blade-assembly/documents"}}