Hello
It means the manually selected frequency the FMC operates on is different from the frequency it would have selected itself in your area of operation.
Did it also at one point say "ACARS NO COMM"?
If it didn't I bet it was scanning the wrong frequencies and one of your colleagues manually selected the european ACARS frequency. I think it's 131.75.
Select MENU - ACARS - MISC - FREQ. There you can select Automatic- or manual ACARS frequency.
NCB.. Norsk? Skulle det være en annen grunn så send meg gjerne en privat melding.
Cheers
