Airworthiness Directives Eurocopter France (ECF) Model SA-365N1, AS-365N2, AS 365 N3, EC 155B, and EC155B1 Helicopters
airworthiness · Rule · Final rule. · Published 2010-09-22 · Effective 2010-10-27 · 75 FR 57659
Document
Document number
2010-23098
Federal Register citation
75 FR 57659
Type
Rule
Action
Final rule.
Category
airworthiness
Publication date
2010-09-22
Effective date
2010-10-27
FAA docket
Docket No. FAA-2010-0426
Abstract
We are adopting a new airworthiness directive (AD) for the specified ECF model helicopters. This AD results from a mandatory continuing airworthiness information (MCAI) AD issued by the aviation authority of the European Aviation Safety Agency (EASA). The MCAI AD reports the separation and loss of a stainless steel ring (75 millimeter (mm) in diameter) from a tail rotor blade (blade) sleeve resulting in severe, high-frequency vibrations, which can lead to damage to the fenestron blades, loss of yaw control, and subsequent loss of control of the helicopter.