# Airworthiness Directives; Airbus Helicopters
> **Rule** · Final rule; request for comments. · Published 2018-09-10 · Effective 2018-09-25 · 83 FR 45545
## Document
- **Document number:** 2018-19431
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 83 FR 45545
- **Publication date:** 2018-09-10
- **Effective date:** 2018-09-25
- **FAA docket:** Docket No. FAA-2018-0613
## Abstract

We are adopting a new airworthiness directive (AD) for Airbus Helicopters Model AS350B, AS350B1, AS350B2, AS350B3, and AS350BA helicopters with a Pall Aerospace Corporation inlet barrier filter (IBF) element. This AD requires revising the Rotorcraft Flight Manual Supplement to prohibit operating a helicopter with an IBF element in wet weather and replacing the IBF element if wet. This AD is prompted by a forced landing after an engine flameout. The actions of this AD are intended to address an unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/09/10/2018-19431/airworthiness-directives-airbus-helicopters)
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