airworthiness · Rule · Final rule; request for comments. · Published 2016-01-13 · Effective 2016-01-28 · 81 FR 1492
Document
Document number
2016-00013
Federal Register citation
81 FR 1492
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Agusta S.p.A.
Publication date
2016-01-13
Effective date
2016-01-28
FAA docket
Docket No. FAA-2015-8695
Abstract
We are adopting a new airworthiness directive (AD) for Agusta S.p.A. (Agusta) Model AB139 and AW139 helicopters. This AD requires inspecting each full ice protection system tail rotor slip ring (slip ring) for chatter marks, witness marks, or scoring, and determining the depth of each mounting hole. Based on the findings from the inspection, this AD requires either re-identifying the slip ring or replacing the slip ring. This AD is prompted by two incidents of the slip ring body separating from the supporting flange due to improper torque. These actions are intended to prevent separation of the mounting flange from the slip ring body and subsequent loss of control of the helicopter.