What is Aircraft Airspeed Indicator?
The Aircraft Airspeed Indicator (ASI) Pitot-static instrument used in an aircraft to display the craft's airspeed, typically in knots.
Airspeed indicator is achieved using a thin phosphor bronze (aneroid) diaphragm that measures the dynamic air pressure between the pitot tube (ram air) and the static orifice (static pressure).
This model is BK48.
Function:
Aircraft Airspeed Indicator BK48 is a measure of the pressure difference between the pitot (acting/dynamic pressure) and the static pressure.
Simply put, ram air is pushed into the diaphragm, which is compared to the static pressure.
Static pressure is held by the static port(s) on the side of the fuselage.
Selected location at a location to most accurately detect common barometric pressure (parallel to air flow) and avoid ram (ram) air pressure.
Some aircraft will have more than one port for more accurate pressure measurement during glide and slide.
"Ram air" is the air that is passed by the aircraft through the air collected through the pitot tube hole.
Ram Air can also be called full pressure.
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