The segment NUKTI W66 DKO is no longer valid in recent AIRAC cycles (it was in the past, when the W66 airway was bidirectional, which it no longer is), but because Simbrief doesn’t check/enforce directional airways, it doesn’t show an error.
On the other hand, most aircraft FMS systems do check and enforce airway directionality, thus the import fails.
I have removed the bad LOWW → RKSS route from the Simbrief database.
See also the following topic for more information:
Regards,
Tim
@SimBrief I seem to recall all routes with […] W66 DKO were removed from the database, but I guess not? It’s possible in was re-introduced by someone copying over from edi-gla, I guess.