Originally Posted by
eckhard
Because the FMGC tells the CPC the landing field elevation, so if the FMGC fails, the route is lost and the CPC doesn't know where you are going to land.
I thought about that, but the manual describes a cross link channel which allows CPC 1 and 2 to communicate. I assumed if data was lost from one side, the offside unit would be able to supply the date from the functioning FMC.
From CaptainMongo's description, it seems the FO's FMC retained the route information, and one of the FMC's had a degraded position.
CaptainMongo, what other indications did you get? I'm new to the bus, and I find this information quite interesting.