Talked to a pilot who was a crew member on a flight (his previous company) that was deliberately flown from the company base to destination and returned back with both FMGCSs inop. A320. 2 hours flight in radar and VOR enviroment. No AP, FD, A/THR, reference speeds, picture on ND, anything that comes from any part of FMGCS. First company flight to a new destination. TV reporters on departure and arrival. Of course ATC had no idea. In fact nobody had except the cockpit crew, maintenence and Fight Operations managment.
Cessna-320.