ACARS Technology | Receiving & Decoding Live ACARS [ VHF ] - Part I

Real World Aviation
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ACARS Technology

ACARS is a digital datalink system for transmission of short messages between aircraft and ground stations via airband radio or satellite. The protocol was designed by ARINC and deployed in 1978, using the Telex format.

HOW DOES IT WORK

Representation-of-the-ACARS-sub-systems
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Aircraft Communications Addressing and Reporting System (ACARS) is a digital data link system for the transmission of messages between aircraft and ground stations. At first it relied exclusively on VHF channels but more recently it is now also used in HF & UHF channels. Alternative means of data transmission have been added which have greatly enhanced its geographical coverage. There has also been a rapid trend towards the integration of aircraft systems with the ACARS link. Both have led to rapid growth in its use as an operational communications tool.

Message Content

ACARS messages may be of three types based upon their content:

● Air Traffic Control (ATC)
● Aeronautical Operational Control (AOC)
● Airline Administrative Control (AAC)

FREQUENCY STRUCTURE

acars_signal
acars_signal851×945 161 KB

Parameter Value
Pre-key 16 characters All binary “ones”
Bit Sync 2 characters “+” , “*”
Character Sync 2 characters SYN, SYN (0x16)
Start of Heading 1 character SOH (0x01)
Mode 1 character
Address 7 characters
Technical Acknowledgement 1 character
Label 2 characters
Block Identifier 1 character
Start of Text 1 character
STX (0x02) - if no text ETX (0x03)
Text 220 characters maximum, printable characters only
Suffix 1 character, if single or terminal block ETX, else ETB (0x17)
Block Check Sequence 16 bits
BCS Suffix 1 character DEL (0x7f)

Messages may be single or multi-block. The pre-key sequence and the BCS have no parity bits.

ACARS communications are divided into Category A and Category B.

  • Using Category A, an aircraft may broadcast its messages to all ground stations. This is denoted by
    an ASCII “2” in the Mode field of the downlink message.

  • Using Category B an aircraft transmits its message to a single ground station. This is denoted by an
    ASCII character in the range “@” to “]” in the Mode field of the downlink message.

Technical Specification

Frequency Range: VHF

Operation Mode: CSMA / CD packet ARQ system

Modulation: AM, SUB FSK

Frequency Center: 1800 Hz

ACARS Frequency List | VHF

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FREQUENCY REGION / COUNTRY
131.550 Primary Channel worldwide
129.125 Additional channel for USA & Canada
130.025 Secondary channel for USA and Canada
130.425 Additional channel for USA
130.450 Additional channel for USA & Canada
131.125 Additional channel for USA
131.450 Primary channel for Japan
131.475 Air Canada company channel
131.525 European secondary
131.725 Primary channel in Europe
136.700 Additional channel for USA
136.750 Additional channel for USA
136.800 Additional channel for USA
136.900 European secondary
136.850 SITA North American Frequency
136.750 New European frequency
131.850 New European frequency


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Receiving & Decoding Live ACARS [ VHF ]

Hardware Requirement

Supported OS

Supported OS ( Linux )

Environment / Hypervisor Setup

Windows

  • Step 1: Download Zadig RTL-SDR Drivers: Link

  • Step 2: Once Dowload is completed. Connect RTL-SDR to PC and launch Zadig Software.

Screenshot 2022-03-19 144252
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  • Step 3: Click on options, then List All Devices
    Screenshot 2022-03-19 124535

  • Step 4: Select Bulk-In, interface (Interface 0)

zadig_3

  • Step 5: Now click on install WCID Driver. For me it showing Replace Driver as i’m replacing the existing driver of my RTL-SDR.

  • Step 6: Once the above step is completed, the PC will recorgnize RTL-SDR as USB device.

  • Step 7: Hypervisor Setup ( Ubuntu ) - Setup guide

Note: the steps for setting up OS in Vmware will be similar for other OS.
Raspberry Pi
  • Step 1: Download & install Raspberry pi imager Software : link

Screenshot 2022-06-24 224353

  • Step 3: Baking the Pi - Setup guide ( Timestamp 13:48 - 17:33 )

  • Step 4: Once Baking is completed and ssh 'd into raspberry pi. Connect RTL-SDR to the pi.

  • Step 5: To Check if the Pi is connected to the pi. type lsusb in the terminal.

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Note: If you want to Scan your WIFI network to find the ip address of the Raspberry pi, i'd suggest you to use fing. Available in Android, Windows & Mac

Screenshot_2022-06-24-23-02-34-718_com.overlook.android.fing
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Software Installation

Once OS installation is complete, open a teminal and enter the following commands:

Step 1: Updating & Upgrading the Software 
sudo apt update

sudo apt upgrade -y
Step 2: Installing packages 
sudo apt-get install cmake git libusb-1.0 libusb-1.0-0.dev pkg-config rtl-sdr gr-osmosdr -y
Step 3: Installing RTL-SDR drivers 
cd ~

git clone https://github.com/osmocom/rtl-sdr.git

clear

cd rtl-sdr

sudo mkdir build

cd build/

clear

sudo cmake ../ -DDETACH_KERNEL_DRIVER=ON -DINSTALL_UDEV_RULES=ON

sudo make

sudo make install

sudo ldconfig
Step 4: Installing libacars-package 
clear

cd ~

git clone https://github.com/szpajder/libacars.git

cd libacars

sudo mkdir build

cd build

sudo cmake ..

sudo make

sudo make install
Step 5: Installing acarsdec Software 
clear

cd ~

git clone https://github.com/TLeconte/acarsdec.git

cd acarsdec

mkdir build

cd build/

sudo cmake .. -Drtl=ON

sudo make

sudo make install

ldconfig

Command List

Here are some of the Example commands on how to use Acarsdec.

To get started : sudo acarsdec -h

pi@piaware:~ $ sudo acarsdec -- h
Need at least one of -a|-f|-r|-R options
Acarsdec/acarsserv 3.5 Copyright (c) 2017 Thierry Leconte
(libacars 2.1.4)

Usage: acarsdec  [-v] [-o lv] [-t time] [-A] [-b 'labels,..'] [-i station_id] [-n|-j|-N ipaddr:port] [-l logfile [-H|-D]] [-g gain] [-p ppm] -r rtldevicenumber  f1 [f2] ... [fN]

 -v                     : verbose
 -i stationid           : station id used in acarsdec network format.
 -A                     : don't display uplink messages (ie : only aircraft messages)
 -b filter              : filter output by label (ex: -b "H1:Q0" : only output messages  with label H1 or Q0)
 -o lv                  : output format : 0 : no log, 1 : one line by msg, 2 : full (default) , 3 : monitor , 4 : msg JSON, 5 : route JSON
 -t time                : set forget time (TTL) in seconds for monitor mode (default=600s)
 -l logfile             : append log messages to logfile (Default : stdout).
 -H                     : rotate log file once every hour
 -D                     : rotate log file once every day

 -n ipaddr:port         : send acars messages to addr:port on UDP in planeplotter compatible format
 -N ipaddr:port         : send acars messages to addr:port on UDP in acarsdec native format
 -j ipaddr:port         : send acars messages to addr:port on UDP in acarsdec json format

 -g gain                : set rtl gain in db (0 to 49.6; >52 and -10 will result in AGC; default is AGC)
 -p ppm                 : set rtl ppm frequency correction
 -m rtlMult                     : set rtl sample rate multiplier: 160 for 2 MS/s or 192 for 2.4 MS/s (default: 160)
 -r rtldevice f1 [f2]...[f8]    : decode from rtl dongle number or S/N rtldevice receiving at VHF frequencies f1 and optionally f2 to f8 in Mhz (ie : -r 0 131.525 131.725 131.825 )
 Up to 8 channels may be simultaneously decoded

Decoding single frequency : sudo acarsdec -r 0 131.725

Screenshot 2022-06-25 001933
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Decoding Multiple frequencies: sudo acarsdec -r 0 131.725 131.550

Saving log file: sudo acarsdec -r 0 131.725 -l Test.txt

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Note: To open the file type the command " sudo nano Test.txt " to view. To close the View press ctrl+X.

Save log file once every hour automatically : sudo acarsdec -r 0 131.725 -H -l 1.txt

Save log file every day automatically : sudo acarsdec -r 0 131.725 -D -l 1.txt

Filter & Save log file based on label: sudo acarsdec -r 0 131.725 -b "H1:RA:Q0" -l 1.txt

Decoded ACARS Messages

Here are some of the ACARS Messages i’ve logged.

D-ATIS Message ( Arrival Ariport ) 
[#1 (F:131.725 L:-32.5 E:2) 07/06/2022 18:35:40.758 --------------------------------
Mode : 2 Label : A9 Id : D Nak
Aircraft reg: 9V-TRM 
Reassembly: complete
/BOMCDYA.TI2/VOHS ARR ATIS U
1830Z ATIS VOHS 071830
VOHS ATIS U
1830Z
TRL FL85
/ EXPECT RADAR VECTOR 
ILS APPROACH RUNWAY 
27L. RUNWAY IN USE 
27L.
WIND 260/08KT MAX18KT
VIS 6000M
CLD SCT020
T28 DP18
QNH 1008HPA
NOSIG
FOR PRE DEPARTURE 
CLEARANCE CONTACT 
GROUND ON 121.85MHZ. 
AIRCRAFT EQUIPPED 
WITH ACARS CAN 
REQUEST CLEARANCE 
THROUGH DATALINK.
CONFIRM ATIS U
3747

[#1 (F:131.725 L:-42.0 E:2) 10/06/2022 03:53:00.412 --------------------------------
Mode : 2 Label : A9 Id : J Nak
Aircraft reg: 4R-ALH
Reassembly: skipped
A. ALL ARRIVALS TO VACATE RUNWAY VIA TAXIWAY R. IF UNABLE ADVISE APPROACH RADAR BY 10 NM FROM TOUCHDOWN .
DEPARTING AIRCRAFT REQUIRING FULL LENGTH SHALL INFORM ATC PRIOR TO TAXI
CONFIR ATIS I74DE


[#1 (F:131.725 L:-40.3 E:1) 10/06/2022 23:43:37.568 --------------------------------
Mode : 2 Label : RA Id : B Nak
Aircraft reg: VT-IXS
Reassembly: skipped
QUDELOZ6E~1WX UPLINK~
-  WX RESPONSE  329I
NO LATEST DATA FOR VOHS, PLEASE STANDBY FOR MANUAL RESPONSE
END

[#1 (F:131.725 L:-41.8 E:1) 12/06/2022 06:20:48.484 --------------------------------
Mode : 2 Label : RA Id : W Nak
Aircraft reg: VH-ZNC
Reassembly: in progress
QUHDQONQF~1WXR01
ATIS
ATIS YPDN H   120520
  APCH:VISUAL
  RWY: 11 AND 36
  SURFACE COND:
  OPR INFO:RPAS OPS 1 MILE SOUTH NOT ABOVE 150 FT
LAHSO

  WIND:07010KT
  VIS:8000
  WX:FU IN THE AREA
  CLD:NO SIGNI
ETB

[#1 (F:131.725 L:-42.0 E:3) 12/06/2022 07:25:52.531 --------------------------------
Mode : 2 Label : A9 Id : T Nak
Aircraft reg: VT-ISC
Reassembly: in progress
/BOMCDYA.TI2/VOMM ARR ATIS P
0702Z ATIS VOMM 120703
VOMM ATIS P
0702Z I L S APPROACH
RWY RUNWAY 2 5
TRANSITION LEVEL
FLIGHT LEVEL 5 5
TAXIWAY BRAVO CLOSED
BETWEEN TAXIWAY ECHO
AND TAXIWAY MIKE.
WIND 2 6 0 D
ETB[#1 (F:131.725 L:-42.1 E:2) 12/06/2022 07:25:56.300 --------------------------------
Mode : 2 Label : A9 Id : U Nak
Aircraft reg: VT-ISC
Reassembly: in progress
EGREES 1
0 KNOTS
VISIBILITY 6
KILOMETERS
CLOUD SCATTERED  2000
FEET
T 3 7 DP 2 5 Q N H 1
0 0 4  Q F E 1 0 0 3
METAR  0 7 0 0
TREND NO SIGNIFICANT
CHANGE
DO NOT MISTAKE
TAMBARAM  AIRFIELD
FOR  CHENNAI
ETB


[#1 (F:131.725 L:-40.3 E:0) 13/06/2022 07:47:27.453 --------------------------------
Mode : 2 Label : A9 Id : K Nak
Aircraft reg: VT-IAQ
Reassembly: complete
/BOMCDYA.TI2/VECC ARR ATIS C
0730Z ATIS VECC 130741
VECC ATIS C
0730ZRWY19L
TRL FL55
/ EXPECT CAT 1 ILS
ZULU APPROACH RWY 19L.
WIND 190/13KT
VIS
HZ
CLD SCT 018 SCT 100
T36 DP27
QNH 1001HPA
NOSIG
 QFE 1001 HPA. ALL
ARRIVALS TO VACATE
RUNWAY VIA TWY R. IF
UNABLE ADVISE
APPROACH RADAR BY 10
NM FROM TOUCHDOWN.
DEPARTING AIRCRAFT
REQUIRING FULL LENGTH
SHALL INFORM ATC
PRIOR TO TAXI.
CONFIR ATIS C
1BC5
Weather Report 
[#1 (F:131.725 L:-34.4 E:0) 07/06/2022 19:34:15.726 --------------------------------
Mode : 2 Label : C1 Id : Q Ack : 9
Aircraft reg: VT-PPV 
Reassembly: complete
.SINGMXS 071934
AGM
AN .VT-PPV/GL VTZ1
-  WEATHER REPORT
SA 07/19:30     
METAR VOMM 071930Z 24013KT 6000 FEW020 31/27 Q1003 NOSIG=
SA 07/19:30     
METAR VOBL 071930Z 27012KT 6000 SCT012 SCT080 23/21 Q1012 NOSIG=

[#1 (F:131.725 L:-41.8 E:2) 10/06/2022 00:50:35.552 --------------------------------
Mode : 2 Label : RA Id : C Nak
Aircraft reg: VT-IHZ
Reassembly: skipped
QUDELAS6E~1
FIRST METAR WILL BE AVL
AT 0200Z EXPECT NOSIG WX

[#1 (F:131.725 L:-39.6 E:0) 12/06/2022 23:00:44.550 --------------------------------
Mode : 2 Label : 33 Id : V Nak
Aircraft reg: HZ-AR12
Reassembly: complete
:OPS MESSAGE

"WMKK/KUL  KUALA LUMPUR/SEPANG INTL
  SA  122230 VRB02KT 9000 FEW008 FEW017CB 26/24 Q1009 NOSIG=
  FC  WX NOT AVAILABLE
  FT  121700 1218/1400 VRB03KT 9999 FEW017CB PROB30 TEMPO 1222/1302 3000 TSRA
             FEW010 FEW016CB SCT018=
WSSS/SIN  SINGAPORE/CHANGI
  SA  122230 35004KT 8000 TS FEW014 FEW016CB SCT025 BKN300 26/24 Q1010 TEMPO
             FM2250 TL2320 3000 TSRA BECMG FM2320 TL0000 NSW=
  FC  WX NOT AVAILABLE
  FT  122245 1223/1400 25007KT 9999 FEW015 SCT020 TEMPO 1223/1302 3000 TSRA
             FEW012CB BKN015=
VOMM/MAA  CHENNAI INTL
  SA  122230 27008KT 4000 BR SCT020 FEW025TCU BKN100 28/25 Q1006 NOSIG=
  FC  122000 1221/1306 25010KT 6000 SCT020 SCT100 TEMPO 1300/1303 5000 BR=
  FT  121700 1218/1324 25010KT 6000 SCT020 SCT100 TEMPO 1300/1303 5000 BR TEMPO
             1309/1315 SCT020 FEW025TCU/CB SCT100 BECMG 1312/1313 18010KT BECMG
             1318/1319 25010KT=
VCBI/CMB  KATUNAYAKE/BAN. INT AP COLOMBO
  SA  122210 VRB03KT 9999 FEW017 25/24 Q1009 NOSIG=
  FC  WX NOT AVAILABLE
  FT  121700 1218/1324 23006KT 9999 FEW017 TX31/1307Z TN25/1300Z PROB30 TEMPO
             1222/1302 7000 -TSRA/SHRA SCT016 FEW020CB=
"


[#1 (F:131.725 L:-38.5 E:0) 13/06/2022 06:55:02.265 --------------------------------
Mode : 2 Label : H1 Id : M Nak
Aircraft reg: VT-TDT
Sublabel: M1
Reassembly: in progress
 NO PIREPS FOUND FOR VTBD /WXVOPB,130622,METAR: METAR VOPB 130630Z VRB04KT 6000 SCT014 SCT220 31/25 Q1007 NOSIG  ,TAF: TAF VOPB 130600Z 1309/1318 23007KT 6000 SCT014 SCT090  BECMG 1312/1314 VRB02KT 5000 BR,PIRE>ETB
ADS-C Messages 
[#1 (F:131.725 L:-29.3 E:1) 07/06/2022 19:44:31.412 --------------------------------
Mode : 2 Label : B6 Id : 6 Nak
Aircraft reg: HS-THC Flight id: TG0318
No: J55A
Reassembly: skipped
/CCUCAYA.ADS.HS-THC070C8FC9D9B30A0269B41F160003271940480060170C21E9E7EECA0244B00C508073C78820118851030E2590DFC0000F2559A9C000102A121E440D0C71C1DD6A8A0241390C57F9E0B60A02406B68
ADS-C message:
 Basic report:
  Lat: 17.6648140
  Lon: 83.2674408
  Alt: 40996 ft
  Time: 2669.000 sec past hour (:44:29.000)
  Position accuracy: <0.05 nm
  NAV unit redundancy: OK
  TCAS: OK
 Intermediate projection:
  Distance: 0.375 nm
  True track: 110.0 deg
  Alt: 40996 ft
  ETA: 3 sec
 Fixed projection:
  Lat: 17.0612526
  Lon: 85.7694054
  Alt: 40996 ft
  ETA: 1200 sec
 Flight ID data:
  Flight ID: THA318  
 Airframe ID:
  ICAO ID: 885103
 Earth reference data:
  True track: 105.6 deg
  Ground speed: 447.5 kt
  Vertical speed: 0 ft/min
 Air reference data:
  True heading: 105.0 deg
  Mach speed: 0.8515
  Vertical speed: 0 ft/min
 Meteo data:
  Wind speed: 42.0 kt
  True wind direction: 101.2 deg
  Temperature: -55.50 C
 Predicted route:
  Next waypoint:
   Lat: 17.4998474
   Lon: 83.9207840
   Alt: 40996 ft
   ETA: 313 sec
  Next+1 waypoint:
   Lat: 17.3582268
   Lon: 84.4999695
   Alt: 40996 ft

[#1 (F:131.725 L:-43.1 E:3) 07/06/2022 22:01:48.527 --------------------------------
Mode : 2 Label : A6 Id : F Nak
Aircraft reg: VT-TVD 
Reassembly: skipped
/CCUCAYA.ADS.VT-TVD07010BCB0C010D010E01100111010F01150114EE38
ADS-C message:
 Periodic contract request:
  Contract number: 1
  Reporting interval: 768 seconds
  Flight ID: every 1 reports
  Predicted route: every 1 reports
  Earth reference data: every 1 reports
  Meteo data: every 1 reports
  Airframe ID: every 1 reports
  Air reference data: every 1 reports
  Aircraft intent data: every 1 reports, projection time: 20 minutes

[#1 (F:131.725 L:-40.0 E:0) 07/06/2022 21:39:08.630 --------------------------------
Mode : 2 Label : A6 Id : C Nak
Aircraft reg: A7-APF 
Reassembly: skipped
/CCUCAYA.ADS.A7-APF01F67A
ADS-C message:
 Cancel all contracts and terminate connection
Position Report / Waypoints 
[#1 (F:131.725 L:-39.0 E:0) 08/06/2022 01:29:18.899 --------------------------------
Mode : 2 Label : 14 Id : 6 Nak
Aircraft reg: B-308L Flight id: 3U3809
No: M23A
Reassembly: skipped
PRESENT POSITION REPORT 
DMY 08JUN22,UTC 012917,LAT N 16.593,LON E 83.159,CAS 258,WD  8559,WS
   29,ALT 37977,FOB 17100,ETA 0216

[#1 (F:131.725 L:-41.8 E:2) 09/06/2022 22:56:28.232 --------------------------------
Mode : 2 Label : H1 Id : N Nak
Aircraft reg: A6-BLN
Sublabel: MD
Reassembly: skipped
0129.BIKEN,08734.LAGOG,07725.IGOGU,10613.NILAM,1129.MEKAR,10211.VAMPI,0788.GUNIP,05010.KAKAK,06316.EGURI,06214.KK894,06214.KK893,06214.KK892,06413.KARBO,0641326DA
Messages From ATC 
[#1 (F:131.725 L:-42.1 E:1) 10/06/2022 01:23:27.851 --------------------------------
Mode : 2 Label : A4 Id : G Nak
Aircraft reg: VT-IIB
Reassembly: skipped
/HYDCFYA.FS1/FSM
0120 220610 VOHS
IGO6211 RCD REJECTED
FLIGHT PLAN NOT HELD
REVERT TO VOICE
PROCEDURES

43C4

[#1 (F:131.725 L:-42.1 E:1) 10/06/2022 01:25:14.998 --------------------------------
Mode : 2 Label : RA Id : H Nak
Aircraft reg: VT-IIB
Reassembly: skipped
QUDELAS6E~1
YOUR MSG RECEIVED

[#1 (F:131.725 L:-41.8 E:2) 11/06/2022 05:14:46.591 --------------------------------
Mode : 2 Label : A9 Id : C Nak
Aircraft reg: VT-IJR
Reassembly: skipped
 ARRIVALS TO
REDUCE SPEED TO 160
KNOTS AT 10 MILES TO
TOUCHDOWN.
FBB3

[#1 (F:131.725 L:-42.0 E:1) 11/06/2022 05:14:49.867 --------------------------------
Mode : 2 Label : RA Id : D Nak
Aircraft reg: VT-IJR
Reassembly: skipped
QUDELAS6E~1
YOUR MSG RECEIVED

[#1 (F:131.725 L:-34.5 E:2) 09/06/2022 07:04:05.445 --------------------------------
Mode : 2 Label : A9 Id : S Nak
Aircraft reg: VT-TVD
Reassembly: skipped
AFTER VACATING RWY CONTACT 121.9 MHZ. DEPARTURES AFTER PASSING 800FT CONTACT RADAR 127.9 MHZ.2644

[#1 (F:131.725 L:-34.5 E:3) 09/06/2022 07:05:38.666 --------------------------------
Mode : 2 Label : 33 Id : Q Nak
Aircraft reg: HZ-AR22
Reassembly: in progress
DATE 09JUN2022 TIME 07.04
GREATING DEAR CREW ON BOARD,

A NEW SIGMET PUBLISHED AND AFFECT THE FLT RT

SIGMET
SIGMET 01 VALID 090345/090745 VECC- VECF KOLKATA FIR EMBD TS OBS WI N1416 E09114 - N1543 E08558 - N1746
ETB


[#1 (F:131.725 L:-42.6 E:3) 13/06/2022 02:01:22.943 --------------------------------
Mode : 2 Label : A9 Id : F Nak
Aircraft reg: VT-ISU
Reassembly: skipped

ACTIVITY AROUND
AIRFIELD. WIP NE OF
THR RWY 14 WITHIN
STRIP AT 75 M FROM
RWY CL. PILOT TO EXER
CTN.
2763

[#1 (F:131.725 L:-40.2 E:0) 13/06/2022 16:42:25.932 --------------------------------
Mode : 2 Label : A9 Id : D Nak
Aircraft reg: RPC3902
Reassembly: in progress
ENHANCED WAKE TURB SEPARATION IN FORCE.
CAUTION POSSIBLE GLIDE SLOPE FLUC
MNM RWY OCCUPANCY REQUIRED.
SQUAWK ASSIGNED TRANSPONDER CODE UNTIL ON STAND.
DXB VFR FREQ 126. 775.
SINGLE RWY OPS.
CAUTION PHOTOMETRIC TESTI
ETB
LoadSheet 
[#1 (F:131.725 L:-40.9 E:1) 11/06/2022 05:44:59.398 --------------------------------
Mode : 2 Label : RA Id : B Nak
Aircraft reg: VT-WJI
Reassembly: duplicate
QUBOMASG8~1
GOFIRST-A320-LOADSHEET-FINAL EDN 01
G8 513/11JUN22  11:13
HYD-IXC VT-WJI  02/04  Y186
DOW       43561 OEW  43311
PAYLOAD    9308
ZFW       52869 MZFW 62800L
T/O FUEL   7872
TOW       60741 MTOW 7350
ETB
CPDLC Messages 
[#1 (F:131.725 L:-42.5 E:2) 10/06/2022 03:13:51.864 --------------------------------
Mode : 2 Label : AA Id : D Nak
Aircraft reg: A6-ETG
Reassembly: skipped
/CCUCAYA.AT1.A6-ETG410AA480202480
FANS-1/A CPDLC Message:
 CPDLC Uplink Message:
  Header:
   Msg ID: 2
   Msg Ref: 5
  Message data:
   CLEARED TO DEVIATE UP TO [distanceoffset] [direction] OF ROUTE
    Offset: 65 nm
    Direction: right

[#1 (F:131.725 L:-42.0 E:2) 10/06/2022 07:08:00.821 --------------------------------
Mode : 2 Label : AA Id : C Nak
Aircraft reg: 9V-SMS
Reassembly: skipped
/MAACAYA.AT1.9V-SMS020A65F0C3FE
FANS-1/A CPDLC Message:
 CPDLC Uplink Message:
  Header:
   Msg ID: 4
  Message data:
   CLIMB TO AND MAINTAIN [altitude]
    Flight level: 410


[#1 (F:131.725 L:-42.1 E:2) 10/06/2022 07:03:52.444 --------------------------------
Mode : 2 Label : AA Id : C Nak
Aircraft reg: F-GZNH
Reassembly: skipped
/CCUCAYA.AT1.F-GZNH023AC6B45870C2F168A0D6
FANS-1/A CPDLC Message:
 CPDLC Uplink Message:
  Header:
   Msg ID: 4
  Message data:
   CONTACT [icaounitname] [frequency]
    Facility Name: VECC
    Facility function: center
    VHF: 132.450 MHz
Messages From Aircraft 
[#1 (F:131.725 L:-39.7 E:0) 11/06/2022 16:23:03.114 --------------------------------
Mode : 2 Label : 80 Id : 7 Nak
Aircraft reg: VT-IAR Flight id: 6E0742
No: M37B
Reassembly: complete
3501 SUMMRY 6002/11 VOMM/VOVZ .VT-IAR
/OUT 1458/FOB 0075
/OFF 1509/FOB 0073
/ON  1612/FOB 0047
/IN  1615/FOB 0046
/TKO F.O. /CRW
/LND F.O. /CRW
/APP N  /RWY /RVR     /ALT
/ERR    /ERR    /ERR
/CPT 18789    /FO  36723
/SO1          /SO2
/CHK

[#1 (F:131.725 L:-35.7 E:0) 10/06/2022 08:24:57.619 --------------------------------
Mode : 2 Label : SA Id : 2 Nak
Aircraft reg: HZ-AR12 Flight id: SV5625
No: S35A
Reassembly: skipped
0EV082456VS/
Media Advisory, version 0:
 Link VHF ACARS established at 08:24:56 UTC
 Available links: VHF ACARS, Default SATCOM
Avionics Warning Messages 
[#1 (F:131.725 L:-19.9 E:0) 12/06/2022 07:18:47.139 --------------------------------
Mode : 2 Label : H1 Id : 5 Nak
Aircraft reg: VT-ISC Flight id: 6E0881
No: C32A
Sublabel: CF
Reassembly: skipped
WRN/WN22061207180078000006ENG 1 HIGH VIBRATION^M

[#1 (F:131.725 L:-21.1 E:0) 10/06/2022 07:02:11.853 --------------------------------
Mode : 2 Label : H1 Id : 5 Nak
Aircraft reg: VT-CIE Flight id: AI0486
No: C11A
Sublabel: CF
Reassembly: skipped
WRN/WN22061007020036000005AIR BLEED

[#1 (F:131.725 L:-23.2 E:0) 10/06/2022 08:37:59.920 --------------------------------
Mode : 2 Label : H1 Id : 6 Nak
Aircraft reg: VT-ILL Flight id: 6E0409
No: C00A
Sublabel: CF
Reassembly: skipped
WRN/PNRC12860AA07/WN22061007350021260002VENT AVNCS SYS FAULT^M

[#1 (F:131.725 L:-24.2 E:0) 10/06/2022 10:21:28.277 --------------------------------
Mode : 2 Label : H1 Id : 2 Nak
Aircraft reg: VT-IUU Flight id: 6E0626
No: C03A
Sublabel: CF
Reassembly: skipped
FLR/FR22061009200024000002POWER SUPPLY INTERRUPT^M/IDATC 2^M

[#1 (F:131.725 L:-41.5 E:1) 10/06/2022 17:22:28.472 --------------------------------
Mode : 2 Label : H1 Id : 2 Nak
Aircraft reg: 4R-ALN Flight id: UL0454
No: C12A
Sublabel: CF
Reassembly: skipped
.1/WRN/WN2206101722  383100506MAINTENANCE STATUS      TOILET

[#1 (F:131.725 L:-35.2 E:0) 10/06/2022 17:23:58.088 --------------------------------
Mode : 2 Label : H1 Id : 0 Nak
Aircraft reg: VT-IVT Flight id: 6E2772
No: C20A
Sublabel: CF
Reassembly: skipped
WRN/WN22061017230028000002FUEL CTR L XFR FAULT^M

[#1 (F:131.725 L:-27.7 E:0) 13/06/2022 16:59:52.084 --------------------------------
Mode : 2 Label : H1 Id : 3 Nak
Aircraft reg: VT-IZJ Flight id: 6E2772
No: C11A
Sublabel: CF
Reassembly: skipped
WRN/WN22061316590036210004AIR ENG 1 BLEED FAULT
Messages From Pilots 
[#1 (F:131.725 L:-40.9 E:1) 12/06/2022 13:47:03.332 --------------------------------
Mode : 2 Label : 3E Id : 9 Nak
Aircraft reg: N579UP Flight id: UP6015
No: M16A
Reassembly: skipped
121346 12BKK SHJ  ATC HAS HELD US DOWN..SHOWING 28.0 AT DESTWILL ADVS IF IT GETSWORSE

[#1 (F:131.725 L:-41.9 E:1) 12/06/2022 04:04:03.902 --------------------------------
Mode : 2 Label : RA Id : B Nak
Aircraft reg: A4O-SH
Reassembly: skipped
  ....     ....
...    ...    ....     ....
SI
NOTOC - YES / NO
L/C AGT MCT440
CAPTAIN ALI MOHD AL SHIDHANI


SENT-TO MCTKLWY ACARSWY MCTASWY

[#1 (F:131.725 L:-42.6 E:3) 10/06/2022 06:57:24.081 --------------------------------
Mode : 2 Label : RA Id : B Nak
Aircraft reg: F-GZNH
Reassembly: skipped
QUCDGOWAF~1DIS01100657
FREE TEXT
AFR165

EVITEMENT EN VISUEL.
ACK TURB MOD.
JE VOUS GARDE A L OEIL...

CAROLINE / DSP


** English translation **

VISUAL AVOIDANCE.
ACK TURB MOD.
I'M WATCHING YOU...

CAROLINE / DSP

[#1 (F:131.725 L:-43.1 E:1) 12/06/2022 14:15:34.640 --------------------------------
Mode : 2 Label : RA Id : D Nak
Aircraft reg: VT-KTM
Reassembly: skipped
QUBLRASI5~1
PLS UPLIFT TOTAL 25MIN FUEL INTO BLR

[#1 (F:131.725 L:-39.7 E:0) 12/06/2022 21:49:55.124 --------------------------------
Mode : 2 Label : RA Id : B Nak
Aircraft reg: A7-APE
Reassembly: skipped
QUDOHEOQR~5HI
MSG ACK. MOCC INFORMED
THANKS
QRIOC

[#1 (F:131.725 L:-39.8 E:2) 12/06/2022 22:04:37.446 --------------------------------
Mode : 2 Label : RA Id : F Nak
Aircraft reg: A7-APE
Reassembly: skipped
QUDOHEOQR~1
MSG FROM GND
DEAR FD
MSG NOTED. PLS CAN YOU CONFIRM  EXACT LOCATION OF INOPERATIVE  CHILLERS
THANKS
QROC
AK000016

[#1 (F:131.725 L:-35.1 E:0) 12/06/2022 22:05:30.448 --------------------------------
Mode : 2 Label : 80 Id : 5 Nak
Aircraft reg: A7-APE Flight id: QR0837
No: U60A
Reassembly: skipped
MOCC: ok wil do that standby

[#1 (F:131.725 L:-41.9 E:1) 13/06/2022 12:03:10.666 --------------------------------
Mode : 2 Label : 81 Id : 7 Nak
Aircraft reg: VT-PPH Flight id: AI0451
No: M47A
Reassembly: skipped
REQ COORDINATE FOR ON TI
ME DEPARTURE OF AIC452
AS FLIGHT CREW HAS TO OP
ERATE AIC479/480 ALSO. C

[#1 (F:131.725 L:-39.5 E:0) 13/06/2022 12:05:42.129 --------------------------------
Mode : 2 Label : RA Id : I Nak
Aircraft reg: VT-PPH
Reassembly: skipped
QUBOMASAI~1DIS01131205
TITLE : MSG
DEAR CAPT
VTZ ADVISED TO EXPEDITE
BOARDING TO COMMENCE SHORTLY
RGDS / IOCC

SOURCE: Wikipedia, ICAO, Wavecom, RTL-SDR, SkyBrary, SITA

Note: If you have any Query Regarding installation or anything, you can PM me directly.

Future Topics

  • Receiving & Decoding Live ACARS from Satellite - Part II
  • Listen to your Local Airport ATC | Real-Time
  • Building an ADS-B Receiver | Live Flight Tracking
  • Why Multilateration? Why not Triangulation or Trilateration?
24 Likes
2

I can honestly say that this is probably one of the best-written RWA Topics I have seen on IFC so far. It’s incredibly fascinating to read and to get to know the whole technology behind it a little better, and how it all works. Thanks for your time and efforts to create something like this! Already looking forward to the next future topics!

5 Likes
4

Thank you😊

5

Very interesting! I’ve got one of the RTL-SDR devices and have used it in the past for listening to ATC and tracking aircraft with ADS-B but never reading ACARS… might have to give this a go.

1 Like
6

You made me dizzy 😵‍💫

1 Like
7

Wow, very cool!

Interesting to see that Japan (my country) has an independent provider for all of this. I wonder why…

1 Like
8

it depends on individual countries’ Frequency Allocation. in this case… maybe because of the frequency spacing.

9

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