Plain English Meaning

A small arrow next to the airspeed display that predicts what your speed will be a few seconds from now if nothing changes. It points up if you're speeding up and down if you're slowing down.

Full Definition

A feature on an electronic primary flight display that shows where the aircraft's indicated airspeed will be in approximately six seconds if the current rate of acceleration or deceleration continues. It typically appears as a magenta or green arrow alongside the airspeed tape, extending upward when accelerating and downward when decelerating.

Context Anchor

Seen on electronic flight displays, especially on the vertical airspeed scale during takeoff, climb, descent, and approach.