Airspeed indicator

Airspeed indicator markings for a light multiengine airplane.

Airspeed indicator and Machmeter of a large jet aircraft with moveable pointers (bugs) at the bezel

The airspeed indicator or airspeed gauge is an instrument used in an aircraft to display the craft's airspeed, typically in knots, to the pilot. In its simplest form, an ASI measures the difference in pressure between the air around the craft and the increased pressure caused by propulsion. The needle tracks pressure differential but the dial is marked off as airspeed.

单词	Airspeed indicator
释义	Airspeed indicator 英语百科 Airspeed indicator The airspeed indicator or airspeed gauge is an instrument used in an aircraft to display the craft's airspeed, typically in knots, to the pilot. In its simplest form, an ASI measures the difference in pressure between the air around the craft and the increased pressure caused by propulsion. The needle tracks pressure differential but the dial is marked off as airspeed.
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