# Amendment of Class E Airspace; Colstrip, MT
> **Rule** · Final rule. · Published 1999-05-13 · 64 FR 25806
## Document
- **Document number:** 99-12059
- **Category:** airspace
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 25806
- **Publication date:** 1999-05-13
- **FAA docket:** Airspace Docket No. 99-ANM-02
## Abstract

This action amends the Colstrip, MT, Class E airspace by providing additional controlled airspace to accommodate the development of a new Standard Instrument Approach Procedure (SIAP) utilizing the Global Positioning System (GPS) at the Colstrip Airport.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/05/13/99-12059/amendment-of-class-e-airspace-colstrip-mt)
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