A/c train
Topic Author
Posts: 674
Joined: Sun Jun 10, 2001 7:57 am


Tue Apr 10, 2001 10:31 pm

what's ACARS and what does it do and how does it work? saw it on a 747-400 just interested
Posts: 60
Joined: Fri Apr 06, 2001 7:14 pm

RE: Acars

Tue Apr 10, 2001 11:21 pm

ACARS = Aircraft Communication And Reporting System

The system provides real time communication to/from aircrafts, i.e. wx-reports from ground to air or
engine readings from air to ground.

SITA / ARINC and other provide the link to/from aircrafts
via VHF

These are the basics - detailed informations would take hours to write


Posts: 694
Joined: Sun Nov 21, 1999 11:44 pm

RE: Acars, Part 2

Tue Apr 10, 2001 11:37 pm

Hi A/C train, Buzz here. HLF-MD11 has it about right. At UAL the pilots love ACARS, they get and send all sorts of information that relates to that flight. It's a data-link that uses a VHF radio freq. to send a "beep" of data. Most of our airplanes use VHF #3.
They'll get a print of the METARS weather where they're going, transmit the passenger load, send maint. gripes, we can send a "Hey-yu" to summon a particular flight if we think the flight crew should know something, flight crews can get the gate information (where passengers connect to the next flight), and our newer airplanes automatically read/ transmit engine performance numbers for evaluation- the flight engineer used to have to write it down and we'd have to type it in.
It's just another way of sending company data, with a touch screen.
It's a VHF radio data link, no voice.... just a beeping modem sound. It's handy.

RE: Acars

Wed Apr 11, 2001 12:25 am


You should add that ACARS can also use HF and SATCOM, its not confined to VHF.
Posts: 460
Joined: Fri Dec 15, 2000 4:18 pm

RE: Acars

Thu Apr 12, 2001 1:26 pm

It sort of like Mother calling...
"Eagles soar. But weasels never get sucked into jet intakes.."
UAL Bagsmasher
Posts: 1839
Joined: Wed Sep 08, 1999 12:52 pm

RE: Buzz

Thu Apr 12, 2001 1:34 pm

What are those "Howgozit" messages I see at work quite often?
Posts: 2295
Joined: Wed Nov 03, 1999 3:54 pm

RE: Acars

Thu Apr 12, 2001 3:05 pm

UAL Bugsmasher...the howgosits are probably sent in error, the position report page in the FMS-CDU has two prompts, one to send the report to ATC via datalink, the other to the company. It is very easy to press the wrong one!
Just a thought  Smile/happy/getting dizzy
Posts: 3549
Joined: Tue Oct 26, 1999 11:34 am

RE: Acars

Thu Apr 12, 2001 4:34 pm

It's a pain in the ass when we get asked to supply football/rugby/Motor Racing etc results.

On the other hand, when an aircraft reports a problem we can download a fault report and have all the possible spares in place before the a/c arrives at its destination.
Posts: 694
Joined: Sun Nov 21, 1999 11:44 pm

Acars Howgozit

Fri Apr 13, 2001 4:12 am

Hi UALbagsmasher, Buzz here. I don't often see the HOWGOZIT at PDX. They used to be printed up so the pilots have a paper to compare the position, time, and fuel remaining.
I didn't know that other companies use HF, or SATCOM for their Acars. We're pretty much locked into VHF.

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