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To: benwood who wrote (51098)6/8/2009 3:52:23 PM
From: Elroy Jetson  Read Replies (2) of 218700
 
Exactly. Computers execute their instructions precisely as they were programmed.

It is inevitable that a complex program will occasionally operate in a manner which was not intended, but was exactly the way it was programmed.

Because of this inevitability, it is dangerous to design systems which over-ride a pilot's decisions.

Computer systems should warn pilots of actions the computer program disagrees with - and example being a stick shaker which warns of a stall.

The Air France was not actively involved in flying the plane. This is what happens when you don't have to do something.

When the fly-by-wire system sensed conflicting air-speed data outside it's parameters it shut itself down, as programmed, and suddenly dumped control of the aircraft to the pilot.

This was a difficult enough situation, similar to the sudden dive a Qantas Airbus was instructed by it's computer to carry out. But in this case something caused additional computer systems, controlling other aircraft operations, to fail in sequence over the next couple of minutes.

If a computer fails, things should usually be left in their previous state. Other programmers believe the things controlled by a computer should be shut-down when the computer fails - perhaps cabin compression.

In any event, complex systems without easy to access redundant manual controls will fail. And the complexity will often cause things to spiral out of control even when manual options are present.
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