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A combination tube used in a pitot-static system, located on the fuselage of the aircraft. It measures the total, or ram, pressure, as well as static pressure. The ram pressure is used for the ASI (air-speed indicator) and the Mach meter. The static system is used for the altimeter and the vertical speed indicator. It consists of a pitot head, which measures the total pressure of the airflow. Vents or small holes on the side of the tube are used to pick up static pressure. See pitot pressure.