Type IIB string action on AdS(5) X S-5 constructed in hep-th/9805028 is put
into a form where it becomes quadratic in fermions. This is achieved by pe
rforming 2-d duality (T-duality) on the action in which kappa-symmetry was
fixed in the Killing gauge in hep-th/9808038. We discuss some properties an
d possible applications of the resulting action.