Vicinity Airspace

To ensure a safe and efficient airspace environment for all aspect s of aviation, the FAA has established an airspace structure that regulates and establishes procedures for aircraft using the national airspace system. The U.S. airspace structure provides two basic categories of airspace, controlled and uncontrolled, and identifies them as Classes A, B, C, D, E, and G. Class A airspace is controlled airspace and includes all airspace from 18,000 feet mean sea level (MSL) to Flight Level 600 (approximately 60,000 feet MSL). Class B airspace is controlled airspace surrounding high capacity commercial service airport s (i.e., Los Angeles International Airport). Class C airspace is controlled airspace surrounding lower activity commercial service and some military airport s (i.e. Ontario International Airport). Class D airspace is controlled airspace surrounding airports with an airport traffic control tower. All aircraft operating within Classes A, B, C, and D airspace must be in contact with the air traffic control facility responsible for that particular airspace. Class E is controlled airspace that encompasses all instrument approach procedures and low altitude federal airways. Only aircraft conducting instrument flights are required t o be in contact with air traffic control when operating in Class E airspace. While aircraft conducting visual flights in Class E airspace are not required to be in radio communications with air traffic control facilities, visual flight can only be conducted if minimum visibility and cloud ceilings exist. Class G airspace is uncontrolled airspace that does not require contact with an air traffic control facility. Chino Airport is surrounded by Class D airspace. The Class D airspace begins at the surface and extends to 2,700 feet MSL. All aircraft operating within this Class D airspace are required to be in contact with the ATCT located on the airport. When the tower is closed, the Class D airspace reverts to Class E airspace. Chino Airport is located within the Class C airspace surrounding Ontario International Airport. The inner ring of the Ontario International Airport airspace has been modified to provide for the Chino Air port Class D airspace. The inner ring of the Ontario Class C airspace begins at the surface and extends to 5,000 feet MSL. Chino Air port is located under the outer ring of the Ontario International Airport Class C airspace, which extends from 2,700 feet MSL to 5,000 feet MSL. The airspace out side the Chino Airport Class D airspace and Ontario International Air port Class C airspace is Class E airspace extending from 700 feet above ground level (AGL) to 18,000 feet MSL. This Class E airspace also surrounds the low altitude federal (Victor) airways in the region. Victor airways are corridors of airspace eight miles wide that extend upward from 1,200 feet AGL to 18,000 feet MSL, and extend between VOR navigational facilities. The Victor airways in the vicinity of the airport emanate from the Homeland VOR and Paradise, Pomona, and Seal Beach VORTACs.