Definition
A service that transmits weather information to an aircraft in flight through a digital data link rather than by voice radio. The aircraft receives text and graphical weather products — such as METARs, TAFs, AIRMETs, SIGMETs, winds aloft, and radar imagery — directly on a cockpit display.
Plain English
A way for pilots to get up-to-date weather sent straight to their cockpit screen while flying, instead of asking a controller or briefer over the radio.
Context Anchor
Seen in cockpit weather displays, flight planning equipment, and in-flight weather update discussions.
Derivation
Data link refers to a digital communication channel between two systems. Combining it with weather service simply means weather information delivered over that digital channel rather than spoken aloud.
Why Pilots Care
Gives pilots immediate access to weather changes so they can adjust route or altitude without leaving the cockpit or waiting for voice updates.
Intuition Check
Do not assume Data Link Weather Service shows the weather exactly as it is at this second. It is delivered electronically and may be delayed, so the pilot must check the age and limits of the information.
Example Sentence 1
Before crossing the ridge, the pilot checked the data link weather service and saw a line of storms had built up along the route.
Example Sentence 2
Before takeoff the instructor showed the student how to request updated radar imagery through the Data Link Weather Service.