Summary
We are adopting a new airworthiness directive (AD) for all Eurocopter France (EC) Model SA-365N, SA-365N1, SA-366G1, AS-365N2, AS 365 N3, EC 155B, and EC155B1 helicopters. This AD was prompted by the discovery of a cracked main rotor mast nut. This condition, if not corrected, could lead to complete failure of the mast nut, resulting in failure of the rotor mast and loss of control of the helicopter. This AD will require replacing the main rotor mast nut with an airworthy main rotor mast nut to prevent this scenario.
Directive Details
AD Number
FAA-2012-0354
Document Number
2012-21262
Type
Rule
Publication Date
September 5, 2012
Effective Date
October 10, 2012
Affected Manufacturer
Eurocopter France
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2012-0354
Topics
Official Documents
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