Definition
An FAA system that delivers routine air traffic control information to pilots in text form via data link rather than voice radio. TDLS provides services such as Pre-Departure Clearances (PDC) and Digital Automatic Terminal Information Service (D-ATIS), allowing the tower to send clearances and airport information directly to the aircraft or to a printer at the gate.
Plain English
A system that lets the control tower send written messages — like clearances and airport information — to the aircraft instead of reading them over the radio.
Context Anchor
Seen in airport operations, clearance delivery, and pre-departure procedures at airports where the service is available.
Derivation
‘Data-link’ refers to a digital communication channel between aircraft and ground systems. The name simply reflects that the tower is delivering its services through that data channel instead of voice.
Why Pilots Care
It reduces voice radio congestion while delivering essential information reliably.
Intuition Check
Do not assume TDLS replaces talking to the tower completely. It only handles certain messages at equipped airports and in equipped aircraft.
Example Sentence 1
At busy airports, pilots often receive their pre-departure clearance through TDLS rather than calling clearance delivery on the radio.
Example Sentence 2
TDLS delivered the updated weather directly to the aircraft display.