[WalterBright]

An example of zipper failure in the Airbus incident is when a wire bundle gets cut, all the functions of all the wires in that bundle are lost. Having two or more smaller bundles physically separated would greatly reduce that risk. Certainly, having the primary and the backup system in the same bundle is a bad idea.

On the 757, one set of control cables runs under the floor. The backup set runs in the ceiling.

[benhurmarcel]

It’s the same on Airbus aircraft, I can tell you from experience.

[WalterBright]

I thought Airbus was fly-by-wire, not cables?

[benhurmarcel]

It is. I'm talking about redundant electrical wires being physically separated so they don't get damaged by the same event.