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Does anyone know if commercial aircraft are using the CAN FD communication bus?

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It's hard to prove a negative, but I would say the answer is no for the following reasons:

  1. In all my years in the avionics industry, I've never heard of anyone even discussing the possibility (though I realize CAN FD is fairly recent).
  2. There are numerous manufacturers that use ARINC 825 which is an adaptation of the basic CAN.
  3. The AEEC has no active committee working to update ARINC 825 to include support for CAN FD which would be the normal process before it would be used in avionics.

Avionics suppliers just can't decide to use a new databus. Their equipment has to talk to equipment from other manufacturers and if you don't have a defined protocol and agreement between suppliers it just won't work.

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  • $\begingroup$ ARINC 825 2018 Supplement 4 describes supported extensions for capabilities derived from CAN FD such as increased data rates (up to 4mbps) and 64byte payload sizes. $\endgroup$
    – cowbert
    Dec 15, 2023 at 17:06

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