# Airworthiness Directives; Airbus Helicopters (Type Certificate Previously Held by Eurocopter France) (Airbus Helicopters)
> **Rule** · Final rule. · Published 2014-03-03 · Effective 2014-04-07 · 79 FR 11701
## Document
- **Document number:** 2014-04314
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 79 FR 11701
- **Publication date:** 2014-03-03
- **Effective date:** 2014-04-07
- **FAA docket:** Docket No. FAA-2013-0770
## Abstract

We are adopting a new airworthiness directive (AD) for certain Airbus Helicopters Model EC225LP helicopters. This AD adds a new operating limitation that requires increasing the minimum density altitude flight limitation for helicopters without certain Eurocopter modifications installed. This AD is prompted by a report that flights below a certain density altitude create oscillations in the main rotor which can transfer dynamic loads to the structure, the main gearbox (MGB), and the main servo-control inputs, which could result in subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2014/03/03/2014-04314/airworthiness-directives-airbus-helicopters-type-certificate-previously-held-by-eurocopter-france)
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