  The contribution of the strong-coupling effects to the free energy of the
"dirty" superfluid $^3He$ is estimated using a simple model. It is shown that
the strong-coupling effects are less susceptible to the quasiparticle
scattering events in comparison to the weak-coupling counterpart. This supports
the conclusion about stabilization of the $B$-phase in aerogel environment at
pressures where the $A$-phase takes over in bulk superfluid $^3He$, in
accordance with recent experimental observations in zero magnetic field.
