Definition
A specific data-link communication capability that allows controllers and pilots to exchange text-based messages (clearances, requests, reports) through the FANS 1/A protocol, transmitted over satellite communications using the Japanese MTSAT satellite system. It is one of several authorized communication methods listed for aircraft operating on certain RNAV departures and oceanic routes where direct voice contact is impractical.
Plain English
It's a way for pilots and air traffic controllers to send each other typed messages instead of talking on the radio. The messages travel through a satellite (MTSAT) using a standard format called FANS 1/A. Aircraft equipped with this can be cleared on routes where voice radio coverage is limited.
Context Anchor
Seen in avionics capability lists, flight planning, and procedure or route requirements for aircraft operating where normal voice radio coverage may be limited.
Derivation
CPDLC = Controller-Pilot Data Link Communications, meaning ATC and pilots exchange data instead of voice. FANS = Future Air Navigation System, the original ICAO concept (now in service) for using satellites and data link instead of ground-based radio and radar. SATCOM = Satellite Communications. MTSAT = Multifunctional Transport Satellite, a Japanese geostationary satellite system that historically provided this data-link service over the Pacific.
Why Pilots Care
Provides reliable communication beyond VHF range, reducing voice congestion and enabling more efficient routing and clearances.
Analogy
Think of it as a controlled, aviation-approved text message path between the cockpit and air traffic control, with the messages relayed by satellite instead of a cell tower.
Intuition Check
Do not read this as one single box in the airplane. It names the message service, the operating standard, and the satellite system used to carry the messages.
Example Sentence 1
The departure procedure listed CPDLC FANS 1/A SATCOM (MTSAT) as one of the acceptable communication methods, so the dispatcher confirmed our aircraft was equipped before filing.
Example Sentence 2
ATC issued a route amendment via CPDLC FANS 1/A SATCOM (MTSAT) that the pilot accepted with one button press.