Fri, Apr 14, 2006
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
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.
Emergency AD 2006-0084-E refers.
- Within 300 flight hours after 13 April 2006.
- Within 20 flight hours after 13 April 2006.
This Airworthiness Directive becomes effective on 13 April
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
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