Airworthiness Directives; Eurocopter France Helicopters
airworthiness · Rule · Final rule. · Published 2012-09-05 · Effective 2012-10-10 · 77 FR 54353
Document
Document number
2012-21262
Federal Register citation
77 FR 54353
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Eurocopter France
Publication date
2012-09-05
Effective date
2012-10-10
FAA docket
Docket No. FAA-2012-0354
Abstract
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.