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 — onto a combiner glass at eye level, allowing the pilot to read the data while continuing to look outside the aircraft.
Plain English
A see-through screen in front of the pilot that shows key flight numbers and symbols, so the pilot can read them without looking down at the instrument panel.
Context Anchor
Pilots encounter HUDs in aircraft equipped with forward-view displays, especially during takeoff, approach, landing, and instrument flying.
Derivation
Called 'head-up' because the pilot can read it with the head up and eyes outside, as opposed to a 'head-down' instrument panel that requires looking down into the cockpit.
Why Pilots Care
Allows continuous visual contact with the runway or traffic while monitoring essential parameters, reducing head-down time and improving safety during critical flight phases.
Intuition Check
“Head-up” does not mean the display is above the pilot’s head. It means the pilot can keep looking forward while reading the displayed flight information.
Example Sentence 1
On final approach in low visibility, the captain used the HUD to monitor airspeed and glide path while keeping eyes on the runway environment.
Example Sentence 2
The head-up display showed the current airspeed and altitude so the pilot never had to look inside the cockpit while flying the visual traffic pattern.