Definition
An electronic cockpit display that consolidates the core flight instruments — attitude indicator, airspeed, altitude, vertical speed, heading, and usually a horizontal situation indicator — onto a single screen directly in front of the pilot. The PFD replaces the traditional six-pack of mechanical instruments in glass-cockpit aircraft and presents the same information in an integrated graphical format.
Plain English
It is the main screen in front of the pilot that shows everything needed to fly the airplane: how high you are, how fast you are going, which way you are pointed, and whether the wings are level.
Context Anchor
Seen in airplanes with electronic flight displays, especially when scanning instruments during normal flight, instrument training, and cockpit checks before takeoff.
Derivation
Primary because it is the main screen the pilot looks at to fly the airplane, displaying the most important information. Flight Display because it shows the data needed to control the aircraft in flight. The name reflects its role: the first place the pilot's eyes go for flight information.
Why Pilots Care
It replaces separate analog gauges with one integrated screen, lowering scanning workload and improving awareness of attitude and performance during all phases of flight.
Analogy
It is like the main dashboard in a car, but for controlling the airplane in three dimensions instead of just tracking speed and direction on a road.
Intuition Check
Do not assume the PFD controls the airplane by itself. It displays the main flight information; the pilot or autopilot still makes the control inputs.
Example Sentence 1
During the climb, she scanned the PFD to confirm the airplane was holding its pitch attitude and climbing at the target airspeed.
Example Sentence 2
On final approach the pilot cross-checked the Primary Flight Display to keep the flight path stable while monitoring altitude and heading.