What is Airplane Airspeed Indicator BK300?
Airplane Airspeed Indicator is the only fight instrument that uses both a static system and a Pitot system. Static pressure enters the ASI housing, while total pressure warps the diaphragm, which is connected to the ASI pointer via a mechanical link.
The pressure is equal when the aircraft is stationary on the ground and thus shows a value of zero. As the plane moves forward, the air entering the pitot tube has a higher pressure than the static line, warping the diaphragm, which moves the pointer. The ASI is checked before take-off to read zero and during take-off, it should rise appropriately.
Function
Since the airspeed indicator is calibrated at standard temperature and pressure, its readings are inaccurate at different temperatures and altitudes. The specified (unadjusted) airspeed is always used to estimate the stalling propensity of an aircraft.
The electronics correct the altitude and temperature differences for the actual airspeed, which is used to calculate the aircraft's position. In faster aircraft, tachometers that correspond to the speed of sound, called Machmeters, are used.
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