Abstract
Perturbative QCD analysis is presented of the cumulative
out-of-plane momentum distribution in the near-to-planar e+e−
annihilation events, Kout << Q. In this kinematical region
multiple gluon radiation effects become essential. They are
resummed with the single-logarithmic accuracy, which programme
includes the 2-loop treatment of the basic radiation and matching
with the exact 
αs2 result. Dedicated experimental
analyses of 3-jet event characteristics are of special interest
for the study of the non-perturbative confinement effects.