airworthiness · Rule · Final rule. · Published 2022-01-05 · Effective 2022-02-09 · 87 FR 385
Document
Document number
2021-28471
Federal Register citation
87 FR 385
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Airbus
Publication date
2022-01-05
Effective date
2022-02-09
FAA docket
Docket No. FAA-2021-0839
Abstract
The FAA is superseding Airworthiness Directive (AD) 2020-21-01 for certain Airbus Helicopters Model AS-365N2, AS 365N3, EC 155B, EC155B1, and SA-365N1 helicopters. AD 2020-21-01 required 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 MGB T/R drive flange. This AD continues to require modifying the MGB T/R drive flange installation, and includes additional helicopters in the applicability for the required actions. The FAA is issuing this AD to address the unsafe condition on these products.