Questions tagged [acars]

ACARS is a digital datalink system that uses radio or satellite communications channels.

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2answers
890 views

How is the gate/stand communicated to airline pilots?

I have heard that pilots use Controller–Pilot Data Link Communication or ACARS to know which gate (or stand?) they are supposed to be going to but haven't been able to find a definitive answer. Does ...
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1answer
203 views

Aircraft engine communication with satellite

Do pilots get an audible indication when the engines are communicating with the manufacturer whilst in flight. Do these "pings" or "hanshakes" begin on start up and are they always ...
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1answer
671 views

Why would holding instructions be sent as an ACARS message?

I was browsing ACARS messages listed on an aviation enthusiast website in Greece (similar to FR24 and others), and noticed a message sent to UA124, a 767 from KEWR to LGAV: The SAT VOR is located at (...
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1answer
124 views

What does the ACARS Weight and Balance Request page look like?

In the ATSU AOC Preflight menu of an Airbus (maybe Boeing too), there is an option for a weight and balance request. The selection name varies by airline but it may say "W/B Req" "Send ...
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1answer
223 views

Can I generate & transmit ACARS message via software? [closed]

Is there any software available for generating ACARS message? If yes how to transmit that over RF?. I want to do that for academic purpose. My settings are GNU radio and HackRF one.
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2answers
268 views

How do aircraft discern that an ACARS message is being sent to them?

This may be a simple question, but how do airplanes know which ACARS messages are meant for them from the ground? I'm not sure how physically close planes would have to be in order for that to be an ...
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1answer
653 views

Is there a good resource for ACARS messages?

Is there a good place to find out all the types of data that ACARS can send and receive? I've seen high level descriptions, but I'm looking for the data that actually gets fed from or to the Flight ...
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1answer
955 views

What is the difference between ACARS and ADS-B?

What is the difference between ACARS and ADS-B? For weather information in-flight or pre-flight which one is used?
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1answer
364 views

What does "POS ITERV WAS CHGD" mean on the ACARS page of a Boeing 737?

During the whole flight, the message "POS ITERV WAS CHGD" appeared frequently on the ACARS page of the MCDU (Multipurpose Control and Display Unit). The aircraft is a Boeing 737. I cannot find any ...
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1answer
312 views

How is the Flight Plan Data transferred into an aircraft/plane?

I know that pilots have to fill the ICAO standard flight plan and send it to the relevant CAA to be checked, updated if needed and finally approved before the flight takes off. what I am looking for ...
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0answers
56 views

What are the fields of the ground reply (uplink) to a weight-and-balance request?

I am trying to send from the Aircraft MCDU AOC menu (via ACARS Data Link) , a Weight/Balance Request downlink to the Ground Station . I would like to know what are the fields that make up the uplink ...
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1answer
516 views

How is the load & trimsheet form sent to ACARS?

After the last passengers and baggage are loaded onto the aircraft, the pilot in command is given a form called load & trimsheet which shows the passenger/baggage distributions, total weights and ...
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1answer
197 views

How can I identify airliner types that don't have ACARS?

Is there a way to identify what commercial airliners are still flying without ACARS today? Most modern commercial airliners are equipped, but I know some 737s still fly without ACARS, for example.
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1answer
1k views

Which frequencies does VDL Mode 2 use when used via the ATN (rather than ACARS)?

If I understand the slide below correctly (source), CPDLC can be used either via ACARS or via ATN. I know that, in the case of VDL Mode 2, there are specific ACARS frequencies. Which frequencies are ...
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1answer
5k views

How can this ACARS message be decoded?

With regards to the text below, can someone offer either advice or a link to a website/document that would help decode ACARS messages. I am ok with the following: QU - ACARS "to" address Q - ACARS ...
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1answer
596 views

To which security domain does the Cabin Intercommunication Data System (CIDS) belong?

I've read a lot about Cabin Intercommunication Data System (CIDS) functionalities and features, but yet it is not really clear to me if CIDS is part of the Airline Information Services Domain (AISD), ...
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1answer
3k views

How does VDL relate to ACARS and CPDLC?

I know that ACARS and CPDLC are 2 different systems, so I can compare ACARS vs CPDLC, but can I do the same comparation between CPDLC vs VDL? Or a CPDLC it’s a VDL? If CPDLC it is a VDL, ACARS it is ...
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1answer
2k views

How do military fighter aircraft identify themselves and each other?

I live in an area where there is much NATO military activity. Often there are various fighter aircraft fly-overs. But none of the common websites such as flightradar24, flightaware and ...
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1answer
4k views

Why do cockpits with ACARS have printers?

Most cockpits with ACARS have a thermal printer that is used for printing out information received. Why is this information printed out rather than displayed on a scrolling computer screen? Maybe I'...
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1answer
284 views

How do SIGMETs arrive in a cockpit on a modern longhaul flight?

What is todays medium of choice (Voice Radio, ACARS,CPDLC,…) to receive SIGMET messages on a commercial longhaul flight, for example from continental Europe to the US westcoast? Are there any ...
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1answer
3k views

What is the format of the airport codes used in an ACARS OOOI message?

How are the departure and arrival airport codes in the OUT, OFF, ON and IN (OOOI) fields identified by ACARS and transmitted to ground systems? For example, if my aircraft is diverted unexpectedly to ...
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2answers
22k views

What are the differences between ACARS and CPDLC?

What are the differences between Aircraft Communication, Addressing and Reporting System (ACARS), and Controller Pilot Data Link Communication (CPDLC)? Can anyone please let me know in short, what is ...
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0answers
340 views

How to get the fuel on board reading on UVdatalink via Honeywell ACARS system?

I would like to find out if anyone has encountered the following issue and how was it rectified. We are currently seeing the following results on UVdatalink for some of our aircraft that have ...
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2answers
2k views

What avionics systems are interfaced with ACARS?

I am a librarian looking for sources of information to help answer the following questions for one of our researchers: 1. what avionics systems are interfaced with ACARS and 2. how is the interaction ...
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1answer
881 views

What is the significance of the exclamation mark (!) on ACARS page of a Boeing 737?

For a while now I've noticed an exclamation mark on the ACARS inflight page of the B737NG at the beginning of a flight. It is located in the top left corner of the page and it just disappears after a ...
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1answer
1k views

What are the ACARS frequencies and what is their usage?

I have been playing with a SDR dongle. I have been able to decode some ACARS signals using SDR# and acarsd. I have noticed in my area (35 miles west of DFW airport) there are a number of frequencies ...
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1answer
951 views

Is implementation of CPDLC mandated by EASA?

Is CPDLC (Controller–pilot data link communications) mandatory by EASA? I have not heard any update that Airlines are using CPDLC. While talking to some of the pilots I heard that they have been ...
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3answers
906 views

Is it possible to ping ACARS repeatedly and track an aircraft?

This is a followup to What data does ACARS send back to base? Can it be used to track a plane? I had asked this as a part of the earlier question, but it seems to be a large enough issue to be ...
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3answers
5k views

What data does ACARS send back to base? Can it be used to track a plane?

An aircraft's Aircraft Communications Addressing and Reporting System uses line of sight HF via ground stations or satellites to communicate with its base station. This system allows for three types ...