  The description of the three-nucleon system in terms of nucleon and $\Delta$
degrees of freedom is extended to allow for explicit pion production
(absorption) from single dynamic $\Delta$ de-excitation (excitation) processes.
This mechanism yields an energy dependent effective three-body hamiltonean. The
Faddeev equations for the trinucleon bound state are solved with a force model
that has already been tested in the two-nucleon system above pion-production
threshold. The binding energy and other bound state properties are calculated.
The contribution to the effective three-nucleon force arising from the pionic
degrees of freedom is evaluated. The validity of previous coupled-channel
calculations with explicit but stable $\Delta$ isobar components in the
wavefunction is studied.
