Airport Traffic Control Tower (ATCT): A terminal facility that uses air/ground communications, visual signaling, and other devices to provide ATC services to aircraft operating in the vicinity of an airport or on the movement area. Authorizes aircraft to land or takeoff at the airport controlled by the tower or to transit the Class D airspace area regardless of flight plan or weather conditions (IFR or VFR). A tower may also provide approach control services (radar or non-radar).

 

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Airport Traffic Control Tower (ATCT): A terminal facility that uses air/ground communications, visual signaling, and other devices to provide ATC services to aircraft operating in the vicinity of an airport or on the movement ar . . . View Full Definition

Radar Approach Control Facility (RAPCON): A terminal ATC facility that uses radar and non-radar capabilities to provide approach control services to aircraft arriving, departing, or transiting airspace controlled by the facility. Th . . . View Full Definition

National Priorities List For Uncontrolled Hazardous Waste Sites: (National Priorities List or NPL) EPA's list of the most serious uncontrolled or abandoned hazardous waste sites in the United States. The NPL is updated on a regular basis.

Negative Feedback Control: Occurs when information produced by the feedback reverses the direction of the response; regulates the secretion of most hormones.