Eurocopter AS 355 (Twin Ecureuil) Series
Eurocopter AS 355 (Twin Ecureuil) Series Helicopters
Eurocopter AS 355 (Twin Ecureuil) Series Helicopters
| AD/AS 355/93 | Main and Tail Rotors - Servo Controls | 6/2007 |
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| Applicability: | Eurocopter AS 355 F, F1, F2 and N 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 355 No. 67.00.28. |
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| 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 355 No. 67.00.28 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 355 No. 67.00.28 unless they have returned to conformity as detailed in Eurocopter ASB AS 355 No. 67.00.28 or later approved revisions.Note: EASA AD 2007-0099 dated 11 April 2007 refers. |
| 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. |
| This Airworthiness Directive becomes effective on 7 June 2007. |
| 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. |
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David Punshon
Delegate of the Civil Aviation Safety Authority
26 April 2007