Dozens of Indonesian and Russian experts scaled through a remote mountainside searching for the flight recorders of a Russian jet that crashed killing all 45 people onboard.

Sunday's search centered around a ravine on Mount Salak near where the plane's wreckage was found.

The site, located some 80 kilometers from Jakarta, is on the side of a dormant volcano covered in jungle terrain and a near vertical slope.

The doomed jetliner, which was on a promotional sales tour, took off from Jakarta's Halim Airport around 2 p.m. local time Wednesday with an entourage of prospective buyers, journalists and crew.

It was expected to return in less than an hour. But the plane dropped in altitude from 3,000 to 1,800 meters and lost contact with air traffic control.