On Wed, 9 Jan 2008 19:43:17 +0000 (UTC), Bertie the Bunyip
wrote in :

The rudder and the stab are both stil physically ( hydraulics) attached to
the flight controls.

Unless there are hydraulic cylinders attached to the flight controls
to activate the rudder and elevator (doubtful), there is going to be a
requirement for hydrolytic pressure from a pump to activate those
control surfaces. If that hydraulic pump can be controlled by the
hypothetical hacker through the computer system, vulnerability exists,
if the Dreamliner systems are similarly engineered.