Definition
Aircraft instruments that display information using mechanical pointers, needles, or moving dials against a fixed scale, rather than on an electronic screen. Each instrument is typically a self-contained gauge driven by pressure, gyroscopes, or electrical signals, and presents one specific piece of flight data such as airspeed, altitude, or heading.
Plain English
The traditional round flight instruments with needles and dials, like those in older cars. Each gauge shows one piece of information by pointing a needle at a number on its face.
Context Anchor
Seen in instrument flying when using traditional round gauges instead of a glass cockpit display.
Derivation
Analog' comes from the Greek 'analogos,' meaning 'proportionate.' These instruments are called analog because the position of the needle is directly proportionate to the quantity being measured — a needle halfway around the dial means halfway up the scale. This contrasts with digital instruments, which display the value as numerals on a screen.
Why Pilots Care
Many training and general-aviation aircraft still use these instruments; pilots must interpret pointer positions accurately for attitude control and cross-checks, especially when glass-cockpit displays are unavailable or inoperative.
Analogy
An analog instrument is like a clock with hands: you read the information by seeing where the pointer is on the face, not by reading numbers on a screen.
Intuition Check
Analog does not mean old-fashioned or less important here. It means the information is shown by physical movement on a scale instead of by a digital screen.
Example Sentence 1
The training aircraft was equipped with analog instruments, so the student learned to scan the six-pack rather than read a glass display.
Example Sentence 2
When the vacuum system failed, the pilot relied on the remaining analog instruments to keep the wings level.