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AD/DAUPHIN/84 - Main Rotor Hub-to-Main Rotor Mast Bolted Attachment
Eurocopter SA 360 and SA 365 (Dauphin) SEurocopter SA 360 and SA 365 (Dauphin) Series Helicopters
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Eurocopter SA 360 and SA 365 (Dauphin) Series Helicopters
| AD/DAUPHIN/84 | Main Rotor Hub-to-Main RotorMast Bolted Attachment | 6/2006 TX |
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| Applicability: | Model SA 365 N, and N1 helicopters, Model AS 365 N2 and N3 helicopters, and Model SA 365 C, C1, C2, and C3 helicopters; delivered before 27 March 2006, and equipped with a main rotor hub-to-main rotor mast (MRH/mast) bolted attachment assembled by Eurocopter. |
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| Requirement: | 1. On MRH/mast assemblies affected by Applicability section of this Directive, and having logged less than 280 flight hours:Check the tightening torque of the MRH/mast assembly attachment bolts, in accordance with paragraph 2.B. of Eurocopter AS 365N Alert Service Bulletin (ASB) No. 62.00.22, or SA 365 C ASB No. 65.44, as applicable.2. On MRH/mast assemblies affected by Applicability section of this Directive, and having logged more than 280 flight hours:Check the tightening torque of the MRH/mast assembly attachment bolts, in accordance with paragraph 2.B. of Eurocopter AS 365N ASB No. 62.00.22, or SA 365 C ASB No. 65.44, as applicable.Note: EASA Emergency AD 2006-0084-E refers. |
| Compliance: | 1. Within 300 flight hours after 13 April 2006.2. Within 20 flight hours after 13 April 2006. |
| This Airworthiness Directive becomes effective on 13 April 2006. | |
| Background: | Several reports were received of tightening torque loss detected on the main rotor hub-to-main rotor mast bolted attachment on Eurocopter assembled attachments with less than 300 operating hours. A loss of tightening torque can lead to deterioration of the MRH/mast attachment and possible loss of the main rotor. |
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David Villiers
Delegate of the Civil Aviation Safety Authority
12 April 2006