  We discuss three-body supersymmetric top decays, in schemes both with and
without R-parity conservation, assuming that sfermion masses are larger than
m_t. We find that MSSM top decays into chargino/neutralino pairs have a strong
kinematic suppression in the region of the supersymmetric parameter space
consistent with the LEP limits, with a decay width =< 10^{-5} GeV. MSSM top
decays into neutralino pairs have less kinematical suppression, but require a
flavour-changing vertex, and are likely to have a smaller rate. On the other
hand, R-violating decays to single charginos, neutralinos and conventional
fermions can be larger for values of the R-violating couplings still permitted
by other upper limits. The cascade decays of the charginos and neutralinos may
lead to spectacular signals with explicit lepton-number violation, such as
like-sign lepton events.
