# Airworthiness Directives; Fokker Services B.V. Airplanes
> **Rule** · Final rule; request for comments. · Published 2017-11-27 · Effective 2017-12-12 · 82 FR 55939
## Document
- **Document number:** 2017-25382
- **Category:** airworthiness
- **Manufacturer:** Fokker Services B.V.
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 82 FR 55939
- **Publication date:** 2017-11-27
- **Effective date:** 2017-12-12
- **FAA docket:** Docket No. FAA-2017-1095
## Abstract

We are adopting a new airworthiness directive (AD) for certain Fokker Services B.V. Model F.27 airplanes. This AD requires contacting the FAA to obtain instructions for addressing the unsafe condition on these products, and doing the actions specified in those instructions. This AD was prompted by reports indicating that certain exit signs have a hydrogen isotope that decays over time, causing the signs to lose their brightness. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/11/27/2017-25382/airworthiness-directives-fokker-services-bv-airplanes)
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