Definition
A digital datalink system that allows aircraft to exchange short text messages with ground stations, airline operations, and air traffic services using VHF radio, HF radio, or satellite links. It carries operational data such as departure and arrival times, engine performance reports, position updates, weather requests, and maintenance messages.
Plain English
A text-message system between the aircraft and people on the ground. Instead of talking on the radio, the airplane sends short digital messages to the airline, controllers, or maintenance staff.
Context Anchor
Seen in transport-category aircraft, airline operations, and maintenance troubleshooting when reviewing messages sent between the aircraft and the ground.
Derivation
Built from the words in the name: 'addressing' meaning the message is sent to a specific recipient, and 'reporting' meaning the aircraft can send status information automatically. The 'addressing' part is what distinguishes it from a normal radio call — every message is routed to a particular destination, the way an email is.
Why Pilots Care
Reduces radio congestion while allowing real-time updates on flight plans, weather, and aircraft health.
Analogy
ACARS is like a secure text-message system for the airplane, but built for aviation messages rather than casual conversation.
Intuition Check
ACARS is not voice communication. It is a data-message system that sends written information between the aircraft and the ground.
Example Sentence 1
The crew sent their out-off-on-in times automatically through ACARS, so dispatch knew the exact moment the aircraft pushed back.
Example Sentence 2
Maintenance teams review ACARS messages to identify faults before the aircraft lands.