Plain English Meaning

A see-through screen in front of the pilot that shows key flight information in their line of sight, so they don't have to look down at the instrument panel.

Full Definition

A transparent display mounted in the pilot's forward field of view that projects flight information — such as airspeed, altitude, attitude, heading, and flight path guidance — onto a glass combiner so the pilot can read it while looking outside the aircraft.

Context Anchor

Seen in cockpit equipment descriptions, instrument flying discussions, and lists of installed or aircraft components.