Definition
A transparent display mounted in the pilot's forward field of view that projects key flight information — such as airspeed, altitude, attitude, heading, and flight path — onto a combiner glass so the pilot can read the data without looking down at the instrument panel.
Plain English
A see-through screen in front of the pilot that shows flight information, letting the pilot keep their eyes outside while still reading the instruments.
Context Anchor
Seen in airplanes equipped with advanced cockpit displays, especially during takeoff, approach, landing, and other times when looking outside is important.
Derivation
Called 'head-up' because the pilot reads the information with their head up and eyes forward, rather than looking 'head-down' at the instrument panel. The term originated in military aviation in the 1950s.
Why Pilots Care
Maintains situational awareness and reduces head-down time during critical phases like takeoff, approach, and landing.
Analogy
It is similar to seeing driving directions projected onto a car windshield, so you can keep looking at the road while still seeing the information you need.
Intuition Check
A HUD is not just any cockpit screen. It is specifically a display placed in the pilot’s forward view so information can be seen while looking outside.
Example Sentence 1
On final approach, the pilot used the HUD to track the flight path symbol while keeping the runway in sight.
Example Sentence 2
In low visibility, the HUD allowed the crew to monitor flight path without looking away from the windshield.