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pitot-static system
Definição1
A combination pickup used to sample pitot pressure (ram air pressure) and static pressure (still air pressure). These two pressures, taken from outside a moving aircraft, are combined to measure airspeed. Pitot pressure is picked up through an open-end tube that sticks directly into the airstream, and static pressure is picked up through small holes or slots in the side of the pitot-static tube, or through flush ports on the side of the aircraft.
Fonte1
CRANE, Dale (ed.). Dictionary of aeronautical terms. 2nd ed. Renton: ASA, 1991.
Fonte2
FEDERAL AVIATION ADMINISTRATION. Helicopter flying handbook (FAA-H8083-21A). Washington, DC: FAA, 2012.
Fonte3
CROCKER, David. Dictionary of aviation. 2nd ed. London: A&C, 2005.
Nota adicional1
The pitot-static instruments, which include the airspeed indicator, altimeter, and vertical speed indicator, operate on the principle of differential air pressure. Pitot pressure, also called impact, ram, or dynamic pressure, is directed only to the airspeed indicator, while static pressure, or ambient pressure, is directed to all three instruments. An alternate static source may be included allowing you to select an alternate source of ambient pressure in the event the main port becomes blocked
Subárea1
Aircraft Structure
Português
sistema do pitot
Imagem

 Diagram of a pitot-static system including the pitot tube, pitot-static instruments and static port.

Diagram of a pitot-static system including the pitot tube, pitot-static instruments and static port.

Fonte: http://en.wikipedia.org/wiki/File:Faa_pitot_static_system.JPG