# Airworthiness Directives; Agusta S.p.A. Helicopters
> **Rule** · Final rule; request for comments. · Published 2014-11-28 · Effective 2014-12-15 · 79 FR 70785
## Document
- **Document number:** 2014-27995
- **Category:** airworthiness
- **Manufacturer:** Agusta S.p.A.
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 79 FR 70785
- **Publication date:** 2014-11-28
- **Effective date:** 2014-12-15
- **FAA docket:** Docket No. FAA-2014-0971
## Abstract

We are superseding Airworthiness Directive (AD) 2014-07-51 for AgustaWestland S.p.A. Model AB139 and AW139 helicopters with certain main rotor (M/R) rotating scissors installed. AD 2014-07-51 required repetitively inspecting the M/R rotating scissors for play of the lower half scissor spherical bearing (bearing) and removing the bearing if there was play beyond allowable limits. AD 2014-07-51 also required removing all affected bearings. AD 2014-07-51 was prompted by reports of certain bearings dislodging from certain M/R rotating scissors. This new AD retains the requirements of AD 2014-07-51, expands the applicability, and requires installing a special nut. These actions are intended to detect excessive play of the bearing and prevent failure of the M/R rotating scissors and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2014/11/28/2014-27995/airworthiness-directives-agusta-spa-helicopters)
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