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Electronic Buss On Boeing 777-200ER

Wed Mar 19, 2014 10:41 pm


What buss format is used for the electronic interface on the Boeing 777 ie. 1553, USB, Custom Parallel, etc? Is there a Buss Mgt. controller to link multiple busses together or is there one Master Buss with the Flight controller Computer having assigned registers for each instrument that outputs it's data to? Having integrated many large systems, with lots of equipment outputing data for other computers/instruments to use, I know that there is always a need to make sure that all the instruments are behaving correctly - ie. rise time, pulse widths, signal cross talk, etc. Is there test ports (where test equipment is plugged into the buss)? How many are there and where are they located? Is there a test port located in the front landing gear "wheel well" - that is where fighter planes have a lot of their commonly used test connectors located?
Is there a piece of ground equipment plugged into that port before each flight, so that an equipment BIT is run?

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RE: Electronic Buss On Boeing 777-200ER

Thu Mar 20, 2014 12:06 am

It's a ARINC 629 dual data bus system. It is an upgrade from the single 429 system found on 767/757. I've never worked on the 777 much so I don't know much. I bet by today's computer standards it is pretty slow and limited. You have to remember it was originally built in the late 80's and early 90's. That being said it can handle what it needs to do. There is a port in the lower Electronics Bay compartment were you can plug in a terminal. I think it only functions while on the ground.
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RE: Electronic Buss On Boeing 777-200ER

Thu Mar 20, 2014 6:41 am

As above - the main system is ARINC 629. There are many other data bus systems as well, being ARINC 429, 618 (VHF Comms), 453 (WRX and EGPWS) plus other ARINC and Analog systems. There's a Data Conversion Gateway Function for communication of systems and components that run on a different data bus.

A lof of the data you mention can be pulled from the MAT (Maintenance Access Terminal) located in the cockpit, which connects via Ethernet to the AIMS cabnet. Can be used on the ground or in flight. There's also a terminal access point in the cockpit so engineers can connect their laptops for further data and tests.
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RE: Electronic Buss On Boeing 777-200ER

Thu Mar 20, 2014 7:51 am

Quoting DesertSnake (Thread starter):
Is there a piece of ground equipment plugged into that port before each flight, so that an equipment BIT is run?

Modt if not all equpment will perform a BITE test when it is powered up. You donøt need to plug in anything to do the test.
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