# Modification of Class D Airspace and Class E Airspace and Establishment of Class E Airspace; Rapid City, SD
> **Rule** · Final rule. · Published 1999-03-12 · 64 FR 12254
## Document
- **Document number:** 99-6139
- **Category:** airspace
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 12254
- **Publication date:** 1999-03-12
- **FAA docket:** Airspace Docket No. 98-AGL-64
## Abstract

This action modifies Class D airspace and Class E airspace and establishes Class E airspace at Rapid City, SD. This action amends the effective hours of the Class D surface area and the associated Class E airspace to coincide with the time of operation of the airport traffic control tower (ATCT) at Rapid City Regional Airport. This action also establishes a Class E surface area when the ATCT is closed. The purpose of these actions is to clarify when two-way radio communication with the ATCT is required and to provide adequate controlled airspace for instrument approach procedures when the tower is closed.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/03/12/99-6139/modification-of-class-d-airspace-and-class-e-airspace-and-establishment-of-class-e-airspace-rapid)
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