YbAl3C3 exhibits a spin gap formation due to spin dimer ground state below 10 K. In zero-field the ground state is paramagnetic and no sign of long range magnetic ordering down to 50 mK. We have investigated field induced magnetic phase transition on WISH (RB1210357) at 50 mK as well as field dependent of the spin excitations on LET. Our study on WISH clearly reveals the field induced long range AFM ordering above the critical field of 6 T at 50 mK with a propagation vector k=0. The observed Bragg peaks have AFM component as well as FM. To prove that the field induced phase transition is due to BEC of magnons, it is very important to investigate H-T phase diagram. During our last WISH experiment due to time shortage and problem with a dilution fridge, we could only investigate the field dependent of magnetic peaks at 50 mK. Now we proposed to complete full T-H phase diagram up to 14T.