Establishment of Offshore Airspace Area 1485L and Revision of Control 1485H; Barrow, AK

This action establishes Control 1485L and revises Control 1485H offshore airspace in the vicinity of Barrow, AK. This action establishes controlled airspace outside of 12 nautical miles (NM) of the U.S. shoreline upward from 1,200 feet mean sea level (MSL) along the North Slope of Alaska. Additionally, this action revises the altitudes of Control 1485H from FL 230/FL 450 to FL 180/FL 600. This action provides additional controlled airspace for aircraft executing instrument flight rules (IFR) operations at the airfields along the North Slope of Alaska in anticipation of establishing terminal arrival areas associated with Area Navigation (RNAV) Standard Instrument Arrival Procedures (SIAPs).