To clarify incorrect information that leads to the wrong scenarios and assumptions:
- I have asked pilot friends and between us we have over 100,000 commercial hours. None of us know how to turn the Acars off in the flight deck. Cannot be done.
Really.... try MFD > COMM > MANAGER > ACARS
Four clicks and ACARS is OFF
(to clarify - this does NOT turn off the transceiver, since ACARS is simply a SOURCE for the selected transceiver unit, which incidentally can be ANY of the VHF, HF or SAT radios fitted, but I'm not going to explain all the mode select logic here...)