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Non-towered airports come under area (en-route) control. Remote and virtual tower (RVT) is a system in which ATC is handled by controllers who are not present at the airport itself. Air traffic control responsibilities at airports are usually divided into at least two main areas: ground and tower, though a single controller may work both stations.
Northern California TRACON (NCT) ( Terminal Radar Approach Control ), or NorCal TRACON for short (pronounced "nor-cal tray-con"), also known as NorCal Approach, is an air traffic control facility that provides safety alerts, separation, and sequencing of air traffic arriving, departing, and transiting the airspace and airports in Northern ...
Hybrid cooling towers or wet-dry cooling towers are closed circuit cooling towers that can switch between wet or adiabatic and dry operation. This helps balance water and energy savings across a variety of weather conditions. Some hybrid cooling towers can switch between dry, wet, and adiabatic modes.
A fire lookout tower, fire tower, or lookout tower is a tower that provides housing and protection for a person known as a "fire lookout", whose duty it is to search for wildfires in the wilderness. It is a small building, usually on the summit of a mountain or other high vantage point to maximize viewing distance and range, known as view shed .
UNICOM. A UNICOM ( universal communications) station is an air-ground communication facility operated by a non- air traffic control private agency to provide advisory service at uncontrolled aerodromes and airports and to provide various non-flight services, such as requesting a taxi, even at towered airports. [1]
Common traffic advisory frequency. Common traffic advisory frequency ( CTAF) is the name given to the VHF radio frequency used for air-to-air communication at United States, and Australian non-towered airports . Many towered airports close their towers overnight, keeping the airport open for cargo operations and other activity.
Flak tower. The 'G-Tower' at , Vienna. The top of the 'L-Tower' is visible to the right. Flak towers (German: Flaktürme) were large, above-ground, anti-aircraft gun blockhouse towers constructed by Nazi Germany. There were a total of 8 flak tower complexes in the cities of Berlin (three), Hamburg (two), and Vienna (three) from 1940 onwards.
Panopticon. This plan of Jeremy Bentham's panopticon prison was drawn by Willey Reveley in 1791. The panopticon is a design of institutional building with an inbuilt system of control, originated by the English philosopher and social theorist Jeremy Bentham in the 18th century. The concept is to allow all prisoners of an institution to be ...