  In the framework of the minimal ${SU}(3)_C\otimes {SU}(3)_L \otimes {U}(1)_N$
model, the lepton-flavour-violating decay $\pi^+ \ra \mu^- \nu_\mu e^+ e^+ $ is
calculated without directly invoking lepton mixing. The branching ratio for
this rare pion decay mode is found to be much smaller than the current
experimental upper limit. Dropping out anomalous interactions, this result
coincides with the previous calculation .
