[deeblering4]

I would think one of the pilots would stand behind the plane and verify control surfaces via radio, but I guess that's too time consuming or error prone?

Works fine for cars though. Drive through lube shops and states with safety inspections will perform indicator checks this way. If you push the left blinker and the right light starts flashing you've got a problem...

Hopefully by now the cockpit has access to external cameras to visualize what's happening behind them in real time

[mgsouth]

Watch the Mentour Pilot video; there was a display in the cockpit which showed the actual control surface movement. Why didn't they catch it? I'd guess it was because they were just a regular flight crew as opposed to acceptance test pilots, had never ever seen cross-connected controls before, and when they tested the controls they saw "yep, the surfaces moved" and it just didn't register that some of them were in the wrong direction.

[mjg59]

The primary issue is that once the ailerons were fully deflected, the control display turned green - even if they were deflected in the wrong direction. It seems that despite this test having been performed multiple times, everyone involved was subconsciously looking for "It goes green" and not "It moves in the right direction".

[ilyt]

> I would think one of the pilots would stand behind the plane and verify control surfaces via radio, but I guess that's too time consuming or error prone?

Pointless. Reversing of controls is not possible between flights.

After service it should've been on checklist to validate everything (really, if plane's computer have feedback on position it should immediately alert), but, well, I'd imagine after this it will be mandatory anyway

[HeyLaughingBoy]

No, but hardware breaks and while it may not be cross-connected, you could have the issue where one aileron or the other doesn't move at all.