Definition
The information shown next to each aircraft symbol on an air traffic controller's radar display, typically including the aircraft's identification (call sign), altitude, groundspeed, and assigned destination or beacon code. The data block moves across the screen with the radar target as the aircraft moves.
Plain English
A small label that appears next to an aircraft on the controller's radar screen, showing who the aircraft is, how high it is, and how fast it's going. The label moves with the aircraft as it travels across the screen.
Context Anchor
Seen in TRACON and radar-control discussions, especially when explaining what controllers see on their radar displays while working arriving, departing, and nearby aircraft.
Derivation
A 'block' here means a grouped set of information presented together — like a paragraph or panel of text. The 'data block' is the block of data attached to each aircraft on the radar display.
Why Pilots Care
They enable controllers to quickly identify and separate aircraft, reducing the risk of conflicts in busy terminal airspace.
Analogy
An aircraft data block is like a name tag attached to an airplane’s symbol on the controller’s screen. The symbol shows where the aircraft is; the data block tells the controller which aircraft it is and gives useful details about it.
Intuition Check
Do not think of “blocks” as physical objects on the aircraft. Here, aircraft data blocks are screen labels on an air traffic control radar display.
Example Sentence 1
The TRACON controller checked the aircraft's data block to confirm the assigned altitude before issuing a descent clearance.
Example Sentence 2
During busy traffic, clear aircraft data blocks help prevent misidentification of targets on the scope.