  We describe some salient features of the $331_F$ (Frampton-Pisano-Pleitez)
bilepton model, in which the constraints of anomaly cancelation require the
number of generations to be three. In a class of six models, four of which
characterised by a $\beta$ parameter describing the embedding of the
hypercharge in the $SU(3)_L$ symmetry, a specific choice for $\beta$ allows
bileptons in the spectrum, i.e. vectors and scalars of lepton numbers $\pm 2$.
At the same time the model allows exotic quarks, with the third quark
generation treated asymmetrically respect to the other two. Bileptons generate
specific signatures in the form of multilepton final states in Drell-Yan like
processes, with and without associated jets, which can be searched for at the
LHC.
