# Establishment of Class D Airspace; Castle Airport, Atwater, CA
> **Rule** · Final rule. · Published 2006-12-14 · 71 FR 75110
## Document
- **Document number:** 06-9694
- **Category:** airspace
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 71 FR 75110
- **Publication date:** 2006-12-14
- **FAA docket:** Docket FAA 2006-25671
## Abstract

This action establishes Class D airspace at Castle Airport, Atwater, CA. A contract Airport Traffic Control Tower (ATCT) is being established at Castle Airport, Atwater, CA, which will meet criteria for Class D airspace. Class D airspace is required when the ATCT is open, and to contain and protect Standard Instrument Approach Procedures (SIAPs) and other Instrument Flight Rules (IFR) operations at the airport. This action would establish Class D airspace extending upward from the surface to 2,500 feet Mean Sea Level (MSL) within a 4.5 nautical mile radius of the airport.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/12/14/06-9694/establishment-of-class-d-airspace-castle-airport-atwater-ca)
---
*AI Analytics · CC0 1.0*