{"id":"F2007L01399","name":"AD/ECUREUIL/125 - Main and Tail Rotors - Servo Controls","slug":"ad-ecureuil-125-main-and-tail-rotors-servo-controls","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":65753,"registerId":"commonwealth-F2007L01399-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter AS 350 (Ecureuil) Series Heli","sectionType":"division","heading":"Eurocopter AS 350 (Ecureuil) Series Helicopters","content":"### Eurocopter AS 350 (Ecureuil) Series Helicopters\n\n| AD/ECUREUIL/125 | Main and Tail Rotors - Servo Controls | 6/2007 |\n| --------------- | ------------------------------------- | ------ |\n\n| Applicability: | Eurocopter AS 350B3 and EC 130B4 helicopters that are fitted with GOODRICH main and tail rotor servo-controls without the letter “R” marked in the inspection box of the servo-control identification plate, and whose Part Number (P/N) and Serial Number (S/N) are listed in paragraph 1.A of Eurocopter Alert Service Bulletin (ASB) AS 350 No. 67.00.40 and ASB EC130 No. 67A010 as applicable.                                                                                                                                                                                                                                                                                                                                                                                             |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Check for identification of the P/N and S/N of the servo-controls installed on helicopters and on the shelves listed in paragraph 1.A of Eurocopter ASB AS 332 No. 67.00.37 or later approved revisions.2. Remove from service those servo-controls identified as having P/N and S/N listed in paragraph 1.A of Eurocopter ASB AS 350 No. 67.00.40 and ASB No. 67A010 as applicable, or later approved revisions.3. Do not install servo-controls with P/N and S/N as listed in paragraph 1.A Eurocopter ASB AS 350 No. 67.00.40 and ASB EC 130 No. 67A010 as applicable, unless they have returned to conformity as detailed in Eurocopter ASB AS 350 No. 67.00.40 and ASB EC 130 No. 67A010 as applicable, or later approved revisions.Note: EASA AD 2007-0099 dated 11 April 2007 refers. |\n| Compliance:    | 1. Within 2 months from the effective date of this AD.2. Within 2 years from the effective date of this AD.3. From the effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |\n|                | This Airworthiness Directive becomes effective on 7 June 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n\n| Background: | This AD is in response to a manufacturing non-conformity found on one batch of servo-control cap P/N 800137. A defective servo-control may not stop the rotation of the distributor sleeve which could cause untimely movements of the servo-controls which are used on the main and anti-torque rotors. This can lead to loss of control of the helicopter. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n26 April 2007","sortOrder":0},{"sectionNumber":"AD/ECUREUIL/125","sectionType":"part","heading":"AD/ECUREUIL/125","content":"## AD/ECUREUIL/125","sortOrder":1},{"sectionNumber":"Main and Tail Rotors - Servo Controls","sectionType":"part","heading":"Main and Tail Rotors - Servo Controls","content":"## Main and Tail Rotors - Servo Controls","sortOrder":2},{"sectionNumber":"6/2007","sectionType":"part","heading":"6/2007","content":"## 6/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive limits its scope to specific Goodrich servo‑controls on AS350B3 and EC130B4 helicopters and refers to Eurocopter ASBs for the definitive part/serial list. There is no text in the instrument indicating an expansion or contraction of that scope from an earlier version; obligations and timelines are set within the document and rely on the referenced ASBs for technical conformity procedures (Applicability; Requirement 1–3; Compliance 1–3)."},"complexity_factors":["Narrow applicability to two helicopter types and to servo‑controls with specific P/N and S/N listed in paragraph 1.A of the Eurocopter ASBs (Applicability).","Reliance on external documents for the definitive list of affected parts (Eurocopter ASB AS 350 No. 67.00.40 and ASB EC130 No. 67A010) increases cross‑document tracing (Applicability; Requirement 1 reference).","Three distinct actions with different timing: inspection within 2 months, removal within 2 years, and an immediate prohibition on installation (Requirement 1–3; Compliance 1–3).","Obligation extends beyond installed units to parts 'on the shelves', expanding compliance to inventory control and suppliers (Requirement 1).","Compliance requires maintenance organisations/operators to verify identification plates (presence/absence of letter 'R') and match P/N and S/N — potential record‑search and physical inspection workload (Applicability; Requirement 1).","The removal and prohibition create supply and logistics consequences for operators and parts suppliers if affected units are common in the fleet (Requirement 2–3).","Rectification route is limited to returning units to 'conformity' as detailed in the Eurocopter ASBs, creating dependence on manufacturer repair/inspection procedures (Requirement 3).","Safety rationale and effective date are explicit, but corrective technical details are delegated to the referenced ASBs and EASA AD (Background; Note)."],"plain_english_summary":"Requires operators and maintenance organisations to identify specified Goodrich main and tail rotor servo‑controls by part and serial number on Eurocopter AS350B3 and EC130B4 helicopters, remove affected units from service, and prohibit installing listed units unless returned to conformity. Deadlines are set for inspection and removal. The rule responds to a manufacturing defect that can allow unintended servo movement and create a risk of loss of control."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific manufacturing defect in a specific batch of servo-controls for specific helicopter models. The scope has not expanded beyond this targeted safety intervention."},"complexity_factors":["Multiple cross-references to external Eurocopter Alert Service Bulletins (ASBs) — operators must consult separate documents (AS 350 No. 67.00.40, EC130 No. 67A010, AS 332 No. 67.00.37) to identify affected parts","Nested applicability conditions: must check helicopter model AND manufacturer (GOODRICH) AND absence of 'R' marking AND specific P/N and S/N ranges","Three separate compliance deadlines with different timeframes (2 months, 2 years, immediate)","Technical aviation terminology requiring specialized knowledge (servo-controls, distributor sleeve, anti-torque rotors, P/N, S/N)","Reference to European regulatory equivalent (EASA AD 2007-0099) for context but not binding guidance"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of certain Eurocopter AS350B3 and EC130B4 helicopters to inspect for and remove specific GOODRICH servo‑controls made with a manufacturing defect (those without an “R” on the ID plate). Inspections are due within 2 months, removal within 2 years, and installation of affected units is prohibited unless repaired per manufacturer instructions. It addresses a failure risk that could cause sudden, uncontrollable rotor movements and loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ecureuil-125-main-and-tail-rotors-servo-controls","history":"/api/acts/ad-ecureuil-125-main-and-tail-rotors-servo-controls/history","analysis":"/api/acts/ad-ecureuil-125-main-and-tail-rotors-servo-controls/analysis","conflicts":"/api/acts/ad-ecureuil-125-main-and-tail-rotors-servo-controls/conflicts","importantCases":"/api/acts/ad-ecureuil-125-main-and-tail-rotors-servo-controls/important-cases","documents":"/api/acts/ad-ecureuil-125-main-and-tail-rotors-servo-controls/documents"}}