  Non--resonant decays of charmed mesons into three pseudoscalars are analyzed
in a weak gauged $U(4)_L \otimes U(4)_R$ chiral lagrangian model. The
calculation is free of unknown parameters and only requires the masses of
pseudoscalar mesons as hadronic inputs. When comparison with experimental data
is possible we find that in some processes we have good agreement and in others
we are an order of magnitude below. This may be due to the absence in our
calculation of final state interactions, presumably important here, and the
manifest difficulty in extracting the non--resonant contribution from an
experimental point of view.
