WELCOME ADVANCE FLYING ACADEMY
AIRSPEED INDICATOR
The airspeed indicator measures the speed of the aircraft through the Air. But really this is the speed at which the air is flowing over the airplane. And Remember. This is not a measurement of ground speed. The dial is usually Calibrated in Nautical miles Knows as KNOTS.
KNOTS vs MILES
Knots are a measure of speed based on nautical. Or sea miles. Avionic uses both nautical and statute miles for measuring distance and speed. But the airspeed indicator Typically shows KNOTS
Nautical mile =6,076 feet
Statute mile =5,280 feet
Therefore, 1 Nautical mile distance =1.15 Statute mile distance.
The airspeed indicator is connected to the pitot static system. To give reading of speed through the Air. The flight instrument measures the difference between the dynamic pressure in the pitot tube and the atmospheric pressure from the static vent. When the airplane is standing still on the ground. The pressure in the two systems will be the same resulting in a reading of zero. However. When the airplane in the traveling through the Air. The dynamic pressure in the pitot system will increase and a reading is registered.
INDICATED AIRSPEED
The indicated airspeed (IAS) is the reading displayed on the face of the instrument. The small windows at the top and bottom of the airspeed indicator are used for determining True airspeed (TAS) Remember the airspeed indicator displays the indicated airspeed (IAS) And adjustments are needed to calculate the Calibrated airspeed (CAS) and true airspeed (TAS)
Speed Ranges and limitations are marked on the airspeed indicator and are specific to the make and model of the top aircraft different makes and models of airplanes will have the marking at different speeds based on limitations of each aircraft Typically GREEN MARKING on instruments reflect normal operations. And RED MARKING Reflect abnormal operations or limitations.
THE RED LINE
The speed marked by Red lines is the Never Exceed speed (Vene) this speed never be exceeded in the aircraft or structural damage may occur.
THE YELLOW Arc
The speed range marked by the yellow Arc is the caution speed ranges. Speed ranges indicated by the yellow Arc is smooth air only.
THE GREEN Arc
The green Arc denotes the operating airspeed range.
THE WHITE Arc
The flaps Operating Range is denotes by the white Arc. Flaps may only be used within this range of speed.
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Airspeed indicator