{"id":"F2006B02518","name":"AD/AS 355/69 Amdt 1 - Main Rotor and Tail Rotor Dynamic Components","slug":"ad-as-355-69-amdt-1-main-rotor-and-tail-rotor-dynamic-components","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41774,"registerId":"commonwealth-F2006B02518-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AS 355/69 Amdt 1 - Main Rotor and Tail Rotor Dynamic Components","content":"![](image.001.png)\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/AS 355/69 and issues the following AD under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nEurocopter AS 355 (Twin Ecureuil) Series Helicopters\n\nAD/AS 355/69\n\nAmdt 1\n\n  \n\nMain Rotor and Tail Rotor Dynamic Components\n\n  \n10/2003\n\nApplicability: Model AS 355 E, F, F1, F2, and N helicopters, equipped with dynamic components following overhaul (RG) or repair (RE) at the Eurocopter Helicopter Maintenance and Overhaul Facility (D.E.R.H.), listed in Tables 1 and 2 (as applicable) of paragraph 4 “Appendix” of Eurocopter Alert Service Bulletin No. 62.00.27.\n\nRequirement: 1. Using the Equipment Log Cards (FMEs) of the dynamic components, check whether the dynamic components embody parts affected by this Directive, in accordance with the instructions specified in paragraph 2.B.1. of Alert Service Bulletin No. 62.00.27.\n\nIf the Requirement 1 check does not reveal the existence of a part affected by this Directive, no further action is required.\n\nIf the check reveals the existence of one or more part(s) affected, comply with the instructions specified in paragraph 2.B.2 of Alert Service Bulletin No. 62.00.27.\n\n2. After correction in accordance with paragraph 2.B.2.1 of Alert Service Bulletin No. 62.00.27, if the number of operating hours of a part exceeds its life limit, remove the part concerned or the assembly that embodies the part in accordance with the instructions specified in paragraph 2.B.2.2. of Alert Service Bulletin No. 62.00.27.\n\nComply with paragraph 2.B. of Alert Service Bulletin No. 62.00.27 on dynamic components that have been stored following repair or overhaul, before installation on aircraft.\n\nNote: DGAC AD 2002-452(B) R1 refers.\n\nCompliance: 1. Within 10 flight hours after 11 September 2002.\n\n2. If affected, within 50 flight hours following determination that the life limit has been exceeded.\n\nThe compliance times of this Directive remain unchanged by this issue. This Amendment becomes effective on 2 October 2003.\n\nEurocopter AS 355 (Twin Ecureuil) Series Helicopters\n\nAD/AS 355/69 Amdt 1 (continued)\n\nBackground: A discrepancy in the D.E.R.H. computer system, which is used to carry over the number of operating hours of the parts following repair or overhaul work, is the cause of incorrect completion of some Equipment Log Cards. The result of this discrepancy is that a part that has changed part number or serial number following repair or modification, may have been dispatched with incorrect operating hours. Affected items will show zero hours on their FME.\n\nAmendment 1 is issued in response to a revision of the related DGAC AD, which introduces Alert Service Bulletins in place of the previously referenced Alert Telexes, with no change in technical content.\n\nThe original issue of this Airworthiness Directive became effective on 11 September 2002.\n\n![](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 1 August 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 10 September 2003.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 1 replaces referenced Alert Telexes with Alert Service Bulletins without changing technical requirements or compliance times. The AD revokes the prior AD but does not expand or narrow the set of affected aircraft/parts or the corrective actions required."},"complexity_factors":["Cross-reference to an external manufacturer publication (Eurocopter Alert Service Bulletin No. 62.00.27) for technical instructions","Determination of part applicability depends on Equipment Log Cards / FMEs which may be incomplete or show zero hours","Technical judgement required to determine when a part’s operating hours exceed life limits","Short compliance windows (initial check within 10 flight hours, removal within 50 flight hours after detection) increase operational scheduling pressure","Applicability limited to parts overhauled/repaired at a specific facility (D.E.R.H.), requiring maintenance-history traceability","Requirement to inspect stored repaired/overhauled components before installation adds an administrative step for supply chains"],"plain_english_summary":"This directive requires operators of Eurocopter AS 355 E/F/F1/F2/N helicopters with dynamic components repaired or overhauled at Eurocopter’s D.E.R.H. facility to check Equipment Log Cards (FMEs) against Eurocopter Alert Service Bulletin No. 62.00.27 and follow its instructions, including removing parts that have exceeded their life limits. It responds to a D.E.R.H. computer error that produced incorrect (often zero) operating-hour entries; operators bear the inspection and replacement costs and must act within short flight‑hour windows (10 and 50 hours)."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This amendment is explicitly technical in nature—updating references from 'Alert Telexes' to 'Alert Service Bulletins' with no change to the underlying safety requirements. The scope remains limited to the original safety issue regarding incorrect flight hour recording at the D.E.R.H. facility."},"complexity_factors":["Multiple cross-references to external documents (Eurocopter Alert Service Bulletin No. 62.00.27, DGAC AD 2002-452(B) R1) without reproducing their content","Conditional logic requiring operators to first check, then determine if further action is needed based on results","Nested applicability criteria (specific helicopter models + specific maintenance facility + specific tables in external bulletin)","Dual compliance timelines depending on whether parts are affected and whether life limits are exceeded","Technical aviation terminology (FMEs, dynamic components, life limits) requiring industry knowledge to interpret"],"plain_english_summary":"This CASA safety order (replacing an earlier one) requires owners/operators of Eurocopter AS355 E/F/F1/F2/N helicopters to inspect main- and tail-rotor components overhauled or repaired at Eurocopter’s D.E.R.H. facility after a computer error left some parts with incorrect (zero) flight-hour records. Affected parts must be inspected and removed if they’ve exceeded safe life. Compliance is mandatory and time-limited to prevent use of overused parts."}},"importantCases":[],"_links":{"self":"/api/acts/ad-as-355-69-amdt-1-main-rotor-and-tail-rotor-dynamic-components","history":"/api/acts/ad-as-355-69-amdt-1-main-rotor-and-tail-rotor-dynamic-components/history","analysis":"/api/acts/ad-as-355-69-amdt-1-main-rotor-and-tail-rotor-dynamic-components/analysis","conflicts":"/api/acts/ad-as-355-69-amdt-1-main-rotor-and-tail-rotor-dynamic-components/conflicts","importantCases":"/api/acts/ad-as-355-69-amdt-1-main-rotor-and-tail-rotor-dynamic-components/important-cases","documents":"/api/acts/ad-as-355-69-amdt-1-main-rotor-and-tail-rotor-dynamic-components/documents"}}