airworthiness · Rule · Final rule; request for comments. · Published 2021-04-13 · Effective 2021-04-28 · 86 FR 19127
Document
Document number
2021-07481
Federal Register citation
86 FR 19127
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Leonardo S.p.a.
Publication date
2021-04-13
Effective date
2021-04-28
FAA docket
Docket No. FAA-2017-1077
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain Leonardo S.p.a. Model AB412 helicopters. This AD was prompted by a cracked spiral bevel gear. This AD requires a one-time visual inspection and a recurring fluorescent magnetic particle inspection (FMPI) of affected spiral bevel gears for a crack, and depending on the inspection results, removing the spiral bevel gear from service. This AD also prohibits installing an affected spiral bevel gear unless it has recently passed an FMPI. The FAA is issuing this AD to address the unsafe condition on these products.