Heavy leptons in the scheme with four-component neutrino

The description of heavy leptons which include eta-lepton as a counterpart of electron in the (e-, νsub(e), etasup(+))(μsup(-), νsub(μ), Tsup(+)) Konopinski-Mahmoud scheme has been considered. It is shown that in the framework of SU(2)sub(L)xSU(2)sub(R)xU(1) symmetry of electroweak interaction, models with quark-lepton symmetry including vectorlike ones can describe experimental data without contradiction. The properties of heavy leptons introduced in models under consideration have been discussed. In particular, the eta-lepton life-time can differ from the prediction of the standard Weinberg-Salam theory. Shortly T+ channel decays are outlined