Definition
Electronic flat-panel screens that present flight, engine, and navigation information in place of traditional mechanical instruments. In modern cockpits, glass displays typically consolidate attitude, airspeed, altitude, heading, navigation, and engine data onto one or two large screens (commonly a Primary Flight Display and a Multi-Function Display).
Plain English
Computer screens in the cockpit that show the same information mechanical gauges used to show, but on a single display rather than as a wall of separate dials.
Context Anchor
Seen in modern cockpits during pre-taxi checks, taxiing, takeoff, cruise, and landing.
Derivation
Called 'glass' because the information appears behind a single sheet of display glass, rather than through many individual round-dial instruments. The term came into use as cockpits transitioned from mechanical gauges to electronic screens in the 1980s.
Why Pilots Care
Glass displays change how pilots scan and interpret information. The data is the same as on round-dial instruments, but the layout, symbology, and failure modes are different — so training and habits must adapt accordingly.
Intuition Check
Do not read “glass displays” as the airplane windows. Here, “glass” means electronic cockpit screens that display aircraft information.
Example Sentence 1
The training aircraft was equipped with glass displays, so the student learned to scan a single screen rather than six separate instruments.
Example Sentence 2
The instructor pointed out how the glass displays provide a moving map that helps avoid runway incursions during taxi.