Just thinking out loud... How about a simple hardware device covertly attached to the plane's flaps and rudders... Then using a smart phone to control that har

Just thinking out loud... How about a simple hardware device covertly attached to the plane's flaps and rudders... Then using a smart phone to control that hardware device, thus mechanically overriding the onboard aircraft control system and giving an attacker a degree of control over the plane. How hard is it to get access to a plane to install something like this? Is it possible for a plane to pass an inspection with this device installed? I imagine the motors that control the flaps are powerful, but even being able to lock them up would be useful. Lets say the plane rolls 10 degrees. We can then trigger the device that physically jams the motor, locking the flap in that position. This could be like some small gel that expands and hardens.