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All the flight details received from AirNav ACARS Decoder will be shown on the RadarBox Interface, ACARS Tab.
For each flight you will see:
 Received: time of message reception
 Flight ID: the flight number / callsign for this flight
 Registration: tail number of the aircraft
 Aircraft: type of aircraft in ICAO (4 character) code
 M: ACARS Mode
 Lbl: message Label
 Mode S: the mode S code for this aircraft
 Blc, No: block ID, and message number
 U/D: if the message is an uplink or downlink
What is ACARS?
ACARS ([A]ircraft [C]ommunication [A]ddressing and [R]eporting [S]ystem) is a digital data link system transmitted via
VHF radio which allows airline flight operations departments to communicate with aircraft in their fleet.
This VHF digital transmission system, used by many civilian aircraft and business jets, can be likened to "email for
airplanes," as the registration of each aircraft is its unique add
ARINC (Aeronautical Radio, Inc.). Message traffic is routed via ARINC computers to the proper company, relieving some
of the necessity for routine voice communication. With ACARS, such routine items
passenger loads, fuel data, engine performance data, and much more, can be requested by the company and retrieved
from the aircraft at automatic intervals. Before the advent of ACARS, flight crews had to use VHF voice
to relay this data to their operations on the ground.
The ACARS system is comprised of the following elements:
1- The Airborne Subsystem, onboard the aircraft, which consists of the:
Management Unit - Receives ground-to-air messages vi
Control Unit - The aircrew interface with the ACARS system, consisting of a display screen and printer.
2- The ARINC Ground System, which consists of all the ARINC ACARS remote transmitting/rec
ARINC computer and switching systems.
3- The Air Carrier C2 (Command and Control) and Management Subsystem, which is all the ground based airline
operations departments such as operations control, maintenance and crew scheduling,
Messages can be categorized in two ways: "Downlinks" which are those ACARS transmissions which originate in the
aircraft, and "uplinks" are those messages sent from the ground station to the aircraft.
– World Leader in Flight Tracking and Monitoring
www.airnavsystems.com
, ht address in the system developed by aeronautical radio giant
as departure reports, arrival reports,
via the VHF radio transceiver, and also controls the replies.
linked up with the ACARS system.
Page 39
ress communications
a receiving stations, and the
AirNav® Systems
AirNav RadarBox 2008 Manual
A typical series of ACARS transmissions will look something like this example of United 767
Washington Dulles International (IAD):
ACARS mode: 2 Aircraft reg: .N651UA
Message label: QF Block id: 1 Msg. no: M82A
Flight id: UA0978
Message content:-
IAD2241FRA
-----------------------------------------------------------
The message label QF refers to an ACARS OFF report/message. The nose gear struts are now retracting, and the ACARS
system duly notes this event as the off time. D
the OFF time respectively.
ACARS mode: 2 Aircraft reg: .N651UA
Message label: SA Block id: 2 Msg. no: S82A
Flight id: UA0978
Message content:-
0LS224151V
-----------------------------------------------------------
In this example, we see a downlink response to an uplinked weather report,sent by crew request or automatically by the
flight operations.
ACARS mode: 2 Aircraft reg: .N651UA
Message label: H1 Block id: 3 Msg. no: D89A
Flight id: UA0978
Message content:-
#DFBE13C24651'''''''''''' 8 5972240TO
132202 294 25103269 220
1440 947 520 97418600250107179 5341565144173014923812143 262528 11
0201
-----------------------------------------------------
ACARS mode: 2 Aircraft reg: .N651UA
Message label: H1 Block id: 4 Msg. no: D89B
Flight id: UA0978
Message content:-
#DFB89 0 0 0 661 147 47
A6F003980000080000D2A0000000000000000000002A3
B4F4039C8000080000D2A0000000000000000
1440 950 536
-----------------------------------------------------------
In this series of two messages, we see a takeoff (TO) engine performance report.
ACARS mode: 2 Aircraft reg: .N651UA
Message label: H1 Block id: 5 Msg. no: D89C
Flight id: UA0978
Message content:-
#DFB97418853250111173 5541565144173614933782162 261527 15
0201 89 -2 0 0 671 146 27
A6F4039C8000080000D32000000000000000000000423
　
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