# Modification of Class E Airspace; West Yellowstone, MT
> **Rule** · Final rule. · Published 2010-06-01 · Effective 2010-07-29 · 75 FR 30295
## Document
- **Document number:** 2010-12908
- **Category:** airspace
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 75 FR 30295
- **Publication date:** 2010-06-01
- **Effective date:** 2010-07-29
- **FAA docket:** Docket No. FAA-2009-1101
## Abstract

This action will modify Class E airspace at West Yellowstone, MT, to accommodate aircraft using a new Area Navigation (RNAV) Global Positioning System (GPS) Standard Instrument Approach Procedure (SIAP) at West Yellowstone Airport. This will improve the safety and management of Instrument Flight Rules (IFR) operations at the airport. This action also includes minor adjustments in the legal description of the airspace.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2010/06/01/2010-12908/modification-of-class-e-airspace-west-yellowstone-mt)
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