- doesn't really answer aj's question about the Inertial Systems? Are there any required parameters other than profile rate?
(First I would like to thank PJ2 for pointing to the diagram at post 1034.Thanks BOAC for your comment)
There are messages in that ACARS list that relate
exclusively, specifically, to the inertial reference systems.
I understand that the ADIRUS are composed by Air Data Units (then airspeed would obviously play a role) and
Inertial Reference Units (which don't have air data as input).