  The concept of collinear spontaneous true ternary fission of 252Cf is subject
to critical analysis. The conclusion is that the collinear flight of the
fragments turns out to be a natural and most probable mode. The collinearity
arises in the model on the prescission stage as a result of the account of the
principles of the collective Bohr's model. It is partly destroyed at the
post-scission stage of spreading of the fragments due to their Coulomb
interaction, with the allowance for the spin effects arising at the moment of
scission. The final angular distribution of the fragments is calculated by
means of the trajectory simulations. The calculated relative angle of the heavy
and light fragments is kept 180 degrees with an uncertainty within 0.4 degree,
which justifies search for a collinear tri-partition at the modern stage of
experiment.
