airworthiness · Rule · Final rule. · Published 2021-02-25 · Effective 2021-04-01 · 86 FR 11404
Document
Document number
2021-03658
Federal Register citation
86 FR 11404
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Leonardo S.p.a.
Publication date
2021-02-25
Effective date
2021-04-01
FAA docket
Docket No. FAA-2020-0503
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain Leonardo S.p.a. (Leonardo) Model AW189 helicopters. This AD requires various repetitive inspections of the main rotor (MR) damper. This AD was prompted by reports of in-service MR damper failures and the development of an improved MR damper. This condition, if not corrected, could lead to loss of the lead-lag damping function of the MR blade, possibly resulting in damage to adjacent critical rotor components and subsequent loss control of the helicopter. The actions of this AD are intended to address the unsafe condition on these products.