{"id":"F2006B02519","name":"AD/AS 355/7 Amdt 5 - Tail Rotor Blade Spar","slug":"ad-as-355-7-amdt-5-tail-rotor-blade-spar","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41775,"registerId":"commonwealth-F2006B02519-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AS 355/7 Amdt 5 - Tail Rotor Blade Spar","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 355 (Twin Ecureuil) Series Helicopters\n\nAD/AS 355/7\n\nAmdt 5\n\n  \nTail Rotor Blade Spar 5/94\n\nApplicability: All models fitted with all dash numbers of tail rotor blades P/N 350A12-0030, 355A12-0031, 355A12-0040, and 355A12-0050.\n\nRequirement: Action in accordance with Eurocopter AS 355 SB No. 05-06 Revision 6.\n\nNote: DGAC AD 84-045-022(B)R4 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/AS 355/7 Amdt 5 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. Amendments 1 to 3 extended both the compliance times and the applicable part numbers. Amendment 4 further extended the part number applicability.\n\nAmendment 5 is issued in response to revision 6 of the Requirement Document which clarifies compliance conditions.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1538},"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"The directive has expanded significantly from its original 1994 scope addressing specific cracking reports. Amendments 1-3 extended compliance times and added applicable part numbers. Amendment 4 further extended part number coverage. Amendment 5 updated compliance conditions to match Revision 6 of the Service Bulletin. The current version covers a broader range of components with modified timelines compared to the original safety issue."},"complexity_factors":["References external technical document (Eurocopter Service Bulletin No. 05-06 Revision 6) not reproduced within the directive","Lists four specific part numbers requiring operators to check applicability against their aircraft records","Conditional execution rules: distinguishes between pilot-performable checks (Paragraph C1) and mechanic-required maintenance","Cross-reference to French aviation authority directive (DGAC AD 84-045-022(B)R4)","Specific documentation carriage and recording requirements for airworthiness compliance"],"plain_english_summary":"This safety directive applies to Eurocopter AS 355 (Twin Ecureuil) helicopters fitted with tail rotor blades P/N 350A12-0030, 355A12-0031, 355A12-0040, or 355A12-0050. It requires operators to follow Eurocopter Service Bulletin No. 05-06 Revision 6 to detect and prevent blade-root cracking that can cause severe vibration and unsafe flight. Licensed maintenance personnel must perform the required work; the pilot may perform the specified daily check. The directive must be recorded in the Maintenance Release, carried on board, and noted in the Daily Inspection if the pilot did the check."}},"importantCases":[],"_links":{"self":"/api/acts/ad-as-355-7-amdt-5-tail-rotor-blade-spar","history":"/api/acts/ad-as-355-7-amdt-5-tail-rotor-blade-spar/history","analysis":"/api/acts/ad-as-355-7-amdt-5-tail-rotor-blade-spar/analysis","conflicts":"/api/acts/ad-as-355-7-amdt-5-tail-rotor-blade-spar/conflicts","importantCases":"/api/acts/ad-as-355-7-amdt-5-tail-rotor-blade-spar/important-cases","documents":"/api/acts/ad-as-355-7-amdt-5-tail-rotor-blade-spar/documents"}}