On the A-310 it is possible to cross connect the cannon plugs on the Power Control Units, the PPUs both wing tip and PCU the wing tip brakes and the Command Sensor Unit. Not with each other, but within themselves. If the PPUs are cross connected the systems (flap and/ or slat system will lock up. If the Command sensor unit is cross connected nothing bad will happen but if a problem arises the troubleshooting will be extremely difficult and if the solenoids on the PCU are mismatched the system will not operate properly and things could happen out of sequence.