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For groundwater "potentiometric surface" is a synonym of "piezometric surface" which is an imaginary surface that defines the level to which water in a confined aquifer would rise were it completely pierced with wells. [1] If the potentiometric surface lies above the ground surface, a flowing artesian well results.
A typical runway safety area, marked in brown color. A runway safety area (RSA) or runway end safety area (RESA, if at the end of the runway) is defined as "the surface surrounding the runway prepared or suitable for reducing the risk of damage to airplanes in the event of an undershoot, [1] overshoot, or excursion from the runway." [2]
The Airport Movement Area Safety System (AMASS) visually and aurally prompts tower controllers to respond to situations which potentially compromise safety. AMASS is an add-on enhancement to the host Airport Surface Detection Equipment Model 3 ( ASDE-3 ) radar that provides automated aural alerts to potential runway incursions and other hazards.
In the United States, airport diagrams are published as part of Terminal Procedures Publication and are updated every 56 days unless there is a critical safety issue. [1] Commercial providers such as Jeppesen also published their own version of airport diagrams and can include additional airport details. [8]
The FAA's design criteria for new airports designate Runway Safety Areas (RSAs) to increase the margin of safety if an overrun occurs and to provide additional access room for response vehicles. A United States federal law required that the length of RSAs in airports was to be 1,000 feet (300 m) by the end of 2015, in a response to a runway ...
Daytona Beach International Airport Surveillance Radar. An airport surveillance radar (ASR) is a radar system used at airports to detect and display the presence and position of aircraft in the terminal area, the airspace around airports. It is the main air traffic control system for the airspace around airports. At large airports it typically ...
After several high-profile accidents including Eastern Airlines 111 and the 1991 Los Angeles airport runway collision, the National Transportation Safety Board highlighted the need to find new technologies that could address the issue. In 1991, the NTSB issued a formal safety recommendation that the directed the FAA to develop "an alternate ...
The obstacle-free zone (OFZ) is a 3D volume of airspace below 150 feet (46 m), above the established airport elevation which protects for the transition of aircraft to and from the runway. The Obstacle Free Zone (OFZ) clearing standard precludes taxiing and parked airplanes and object penetrations, except for frangible navigation aid ( NAVAID ...