The transponders are an easy disable - switch them to standby. Done. However, to prevent the ACARS system from transmitting data requires a bit more work. On the 777, ACARS is an integrated part of the AIMS and as such, has no off switch.One can disable the reporting module of the AIMS by either pulling specific CB's located in the cockpit, de-racking the primary units (2) located in the EE bay AIMS cabinet, or by accessing the ACARS page on an FMS CDU and switching the data link to an unused frequency.
How would someone initiate a "log off & shutdown" on the ACARS? Or does switching freq do that?