airworthiness · Rule · Final rule. · Published 2020-10-08 · Effective 2020-11-12 · 85 FR 63440
Document
Document number
2020-22241
Federal Register citation
85 FR 63440
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Airbus
Publication date
2020-10-08
Effective date
2020-11-12
FAA docket
Docket No. FAA-2020-0410
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain Airbus Helicopters Model AS-365N2, AS 365N3, EC 155B, EC155B1, and SA-365N1 helicopters. This AD requires modifying the main gearbox (MGB) tail rotor (T/R) drive flange installation. This AD was prompted by several reported occurrences of loss of tightening torque of the Shur-Lok nut, which serves as a retainer of the T/R drive flange. The actions of this AD are intended to address an unsafe condition on these products.