# Amendment of Class E Airspace; Sioux City, IA
> **Rule** · Final rule. · Published 2009-02-24 · Effective 2009-05-07 · 74 FR 8168
## Document
- **Document number:** E9-3821
- **Category:** airspace
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 74 FR 8168
- **Publication date:** 2009-02-24
- **Effective date:** 2009-05-07
- **FAA docket:** Docket No. FAA-2008-1104
## Abstract

This action amends Class E airspace at Sioux City, IA. Additional controlled airspace is necessary to accommodate Area Navigation (RNAV) Standard Instrument Approach Procedures (SIAP) at Sioux Gateway Airport/Col. Bud Day Field, Sioux City, IA. The FAA is taking this action to enhance the safety and management of Instrument Flight Rule (IFR) operations at Sioux Gateway Airport/Col. Bud Day Field.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/02/24/E9-3821/amendment-of-class-e-airspace-sioux-city-ia)
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