airworthiness · Rule · Final rule; request for comments. · Published 2014-02-25 · Effective 2014-03-12 · 79 FR 10333
Document
Document number
2014-01956
Federal Register citation
79 FR 10333
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Agusta S.p.A.
Publication date
2014-02-25
Effective date
2014-03-12
FAA docket
Docket No. FAA-2014-0035
Abstract
We are adopting a new airworthiness directive (AD) for Agusta S.p.A. (Agusta) Model AB412 helicopters. This AD requires visually inspecting the main rotor swashplate outer ring (outer ring) for a crack and replacing that outer ring if a crack exists. This AD is prompted by two cases of cracks caused by fatigue on certain outer rings. These actions are intended to prevent the failure of the outer ring, which would lead to loss of main rotor blade pitch control and subsequently loss of helicopter control.