ACARS ([A]ircraft [C]ommunication [A]ddressing and [R]eporting [S]ystem) is a digitaldata link system transmitted via VHF radio which allows airline flight operations departments to communicate with the various aircraft in their fleet.
With ACARS, such routine items as departure reports, arrival reports, passenger loads, fuel data, engine performance data, and much more,can be requested by the company and retrieved from the aircraft at automatic intervals.
This is a frequent vistor to the ACARS screen, a signal that the aircraft is in the process of receiving uplinked messages.
Real-time ACARS data may be made available to those organizations that are performing research which, in the judgment of FSL, is likely to benefit the airlines providing the data.
ACARS must be one of several kinds of input observations (such as radiosondes and METARs).
Schwartz and Benjamin (1995) compared ACARS ascent/descent winds and temperatures with radiosondes and found temperature differences were less than 2C on 94 percent of all occasions, and less than 1C better than 68 percent of the time.
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