UPDATE 1-Ferrovial secures 3.3 bln euro loan

* 3.3 billion euro loan only activates after Cintra merger

* Ferrovial says deal "clears the way for Cintra merger"

* Ferrovial has no major debt maturities for next 3 years (Adds comment on planned Cintra merger, quote from company)

MADRID, June 30 (Reuters) - Spanish building and services group Ferrovial (FER.MC) said on Tuesday it has signed a 3.3 billion euro ($4.66 billion) loan deal with 35 banks which will come into effect when it completes its merger with its motorway unit Cintra (CCIT.MC).

The loan will remove any significant debt maturities for Ferrovial over the next three years and facilitate its planned buyout of the 33 percent of Cintra it does not already own, Ferrovial said in a statement with stockmarket regulator CNMV.

"The new financial structure clears the way for the potential merger with Cintra," Ferrovial said.

Ferrovial used some Cintra shares towards the collateral required for the loan it secured when it acquired British airports operator BAA.

(Reporting by Jonathan Gleave, Editing by David Cowell)