Definition
An analog airspeed indicator is a mechanical cockpit instrument that displays the aircraft's indicated airspeed using a moving needle on a circular dial. It works by comparing ram air pressure from the pitot tube with static air pressure from the static port, and converts the resulting pressure difference into needle movement across a calibrated scale, typically marked in knots.
Plain English
It's the traditional round dial with a needle that shows how fast the aircraft is moving through the air. The needle swings around the dial as airspeed changes, the same way a car speedometer needle moves.
Context Anchor
Seen in instrument flying and unusual-attitude recovery discussions, especially when comparing round-dial instruments with electronic flight displays.
Derivation
"Analog" comes from the Greek analogos, meaning "proportional." The needle's position is directly proportional to the airspeed, in contrast to a digital display that shows airspeed as numbers on a screen.
Why Pilots Care
Provides immediate visual trend information on airspeed changes during instrument recoveries when quick recognition is critical.
Analogy
It is like a car’s traditional speedometer with a needle. You can often tell roughly how fast you are going by the needle’s position before you read the exact number.
Intuition Check
Analog does not just mean old-fashioned here. It means the airspeed is shown by a physical pointer moving across a scale, rather than only by a number on a screen.
Example Sentence 1
During the unusual attitude recovery, the pilot watched the analog ASI needle winding rapidly upward, confirming a nose-low attitude.
Example Sentence 2
Cross-checking the analog ASI confirmed the airspeed was well above stall before rolling wings level.