Union fleet register number as defined in Annex I to Commission Implementing Regulation (EU) 2017/218 [21];
uimhir chlár cabhlaigh an Aontais de réir mar a shainítear in Iarscríbhinn I a ghabhann le Rialachán Cur Chun Feidhme (AE) 2017/218 ón gCoimisiún [21];