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Old 08-26-2019, 06:39 AM
Rainier Lamers Rainier Lamers is offline
Join Date: May 2007
Location: Somerset West
Posts: 1,001

Type this into Google:

investigating CAN bus network integrity in avionics systems

This is one of the strangest papers I have come across in my Avionics career. It investigates the (quite obvious) vulnerability of the CAN bus to a physically connected attacker (of course the same goes for just about anything used in an aircraft today).
Anyway they "reverse engineered" parts of our CAN bus protocol (we had to laugh at this - we put all that in the public domain long ago, all they had to do is download the protocol document from our website).
Anyway - they also had a go at our friends from Garmin, you may find their findings enlightening.

Regardless of Garmin or us - OK to listen to the CAN bus but be very careful sending anything on the CAN bus if you do not have the full picture of how it is implemented - you can quite easily cause havoc unintentionally. Message rates and timing may be of importance and this is not obvious. Also you may think you can use "unused" addresses for your own purposes - but these may be used by the receivers and you would never know.

CEO MGL Avionics
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Old 08-26-2019, 08:40 AM
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rocketbob rocketbob is offline
Join Date: Jun 2006
Location: 8I3
Posts: 3,306

I just started doing an install of a dual G5/GMU11/GAD29B/175 system in a certified aircraft. I have an inexpensive canbus logger I've used to log canbus messages on a car project of mine and plan to do some logging to see if I can make sense of the packets.
Bob Japundza CFI A&PIA
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