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We present an analysis of the ultraviolet and X-Ray variability of the Broad-Line-Radio Galaxy 3C390.3 over 15 years. The UV continuum showed largevariations with amplitudes of up to a factor of 10. We find: (1) The variationsof CIV and Ly_alpha are highly correlated with the UV continuum, and aredelayed with respect to the continuum variations by 50-110 days with the redwing of both CIV and Ly_alpha , leading the blue wing; (2) The CIV/Ly_alpharatio is positively correlated with both the continuum flux and UV linestrength, a behavior different from other AGNs studied so far; (3) The bluesides of the Ly_alpha and CIV profiles are similar to the blue side of theBalmer lines, while the red sides are different, suggesting a different originfor the red peak in the Balmer lines. Our results suggest: (1) The broad CIVand Ly_alpha emitting gas is infalling towards the central object; (2) Theoverall behaviour of the CIV/Ly_alpha ratio and the absence of a big blue bump,strongly indicate the coexistence of optically thick as well as optically thinBLR clouds; (3) Assuming circular symmetry and predominantly circular motion,the BLR gas is situated at 83$\pm$25 lightdays from the central source; (4)Under these assumptions and with the derived circular velocity of $v_{rot}\simeq$ 2850 km s$^{-1}$, the central mass inside this radius is confined to$1.3~10^8 M\odot < M_{CM}< 4.0~10^8 M\odot$; (6) Comparing our results withthose obtained from VLBI and observations of the Fe $K\alpha$ line, suggeststhe association of the BLR with a disk, inclined at 98$\pm$12 degrees withrespect to the direction of superluminal motion of the radio blobs.Comment: MNRAS in pres

The nature of the broad-line region in the radio-loud active galactic nucleus 3C 390.3