Revision of Class D and Establishment of Class E Airspace; Yuma MCAS-Yuma International Airport, AZ

This action will amend the Class D airspace area operating times and establish a Class E airspace surface area at Yuma MCAS-Yuma International Airport, Yuma, AZ. In April of 1998 the U.S. Marines reduced the hours of operation of the Air Traffic Control Tower (ATCT) at Yuma MCAS. The reduction of the ATCT hours of operation has made this action necessary. The intended effect of this action is to modify the hours of the Yuma Class D airspace area in the legal description of the controlled airspace and establish a Class E airspace surface area to contain instrument operations during times the ATCT is closed. This action does not involve a change in the dimensions or operating requirements of that airspace containing Instrument Flight Rules (IFR) operations at Yuma MCAS-Yuma International Airport, Yuma, AZ.