Originally Posted by
KC10 FATboy
Correct. He uses the same system which allows ATC to see the Mode Control Panels and FMSs and can edit them without the pilots knowing until the aircraft changed position/attitude.
It sounds like he could go in and insert a bogus point in the "string" of the flight plan and get the aircraft off course.
How could he get the aircraft to change altitude without the pilots changing the altitude setting on the GCP/FCP (or whatever you call in your aircraft)?