Oh for Pete's sake! This was been chewed over until the flavor was all gone
years ago.
If "Plautus Satire" weren't one of the most aggressively ignorant trolls on the 'net (he's got a history of this kind of crapola) he might just want to take a look at
this paper.
In it, JREF forum member
apathoid, who works on the avionics systems of 767s and 757s
for a living puts on his black hat and brainstorms ideas for how one might take over control of one of these airplanes and fly it against the will of the pilots. He ultimately concludes that he can't come up with a method that can't easily be defeated, and that trying to hit a target the size of the WTC towers using the autopilot and navigation systems provided is impractical due to the magnitude of the errors inherent in these systems.
It's illustrated with material direct from Boeing's technical manuals and, for people interested in technology, chock-full of geeky goodness.
Something else that occurs to me about the prospect of keeping such a system secret:
A system which has as its purpose depriving the pilots of control over their airplane is
by definition a system whose failure could be expected to cause a total loss of plane, crew and passengers. In the regulatory climate in which airlines operate, such a system would be subject to
mandatory scheduled testing and maintenance. That means:
*Specialized test equipment would have to be designed, approved, manufactured and distributed.
*Prescribed test and maintenance procedures would have to be developed, approved, published and distributed to the airlines tech staffs.
*Technicians would have to be trained and certified to carry out testing, maintenance and repair of the system.
Fat chance of keeping all that quiet- and when the desk jockeys who specialize in regulatory compliance at the airlines have to deal with the paperwork involved-
even fatter chance.
Vialls, who was absolutely guanophrenic (and a truly vile anti-Semite as well- just look for some of his other writings), seems to have been a victim of the most popular delusion of the Nineties and Oughties- that reality is something that happens inside a computer and that
anything can be achieved by a "hacker" tippy-tapping away at a keyboard.