# Airworthiness Directives; Agusta S.p.A. (Type Certificate Currently Held by AgustaWestland S.p.A.) (Agusta) Helicopters
> **Rule** · Final rule. · Published 2014-01-31 · Effective 2014-03-07 · 79 FR 5257
## Document
- **Document number:** 2014-01953
- **Category:** airworthiness
- **Manufacturer:** Agusta S.p.A. (Type Certificate Currently Held by AgustaWestland S.p.A.) (Agusta)
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 79 FR 5257
- **Publication date:** 2014-01-31
- **Effective date:** 2014-03-07
- **FAA docket:** Docket No. FAA-2013-0478
## Abstract

We are adopting a new airworthiness directive (AD) for certain Agusta Model A109C, A109E, A109S, A109K2, and AW109SP helicopters. This AD requires inspecting the lock wires securing the tail rotor (T/R) duplex bearing locking nut (locking nut) to determine whether any lock wires are missing or damaged. This AD was prompted by reports of loosening T/R locking nuts. The actions of this AD are intended to prevent failure of the T/R and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2014/01/31/2014-01953/airworthiness-directives-agusta-spa-type-certificate-currently-held-by-agustawestland-spa-agusta)
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