# Revision of Class E Airspace; Altus, OK
> **Rule** · Direct final rule; request for comments. · Published 1999-08-05 · Effective 1999-11-04 · 64 FR 42592
## Document
- **Document number:** 99-20082
- **Category:** airspace
- **Type:** Rule
- **Action:** Direct final rule; request for comments.
- **Citation:** 64 FR 42592
- **Publication date:** 1999-08-05
- **Effective date:** 1999-11-04
- **FAA docket:** Airspace Docket No. 99-ASW-16
## Abstract

This amendment revises the Class E airspace at Altus, OK. The development of a Nondirectional Radio Beacon (NDB) Standard Instrument Approach Procedures (SIAP), at Frederick Municipal Airport, Frederick, OK has made this rule necessary. This action is intended to provide adequate controlled airspace extending upward from 700 feet or more above the surface for Instrument Flight Rules (IFR) operations to Frederick Municipal Airport, Frederick, OK.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/08/05/99-20082/revision-of-class-e-airspace-altus-ok)
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