A Russian Sukhoi Superjet100 that with 50 people on board disappeared in mountainous terrain Wednesday during a demonstration flight rescued in Indonesia on Thursday.

Indonesian President Susilo Bambang Yudhoyono said, “The airplane crashed at the edge of Mount Salak. I have spoken directly to our officer in the field. It was around 1.5 kilometers from the informed point of scene. An investigation must be done immediately and thoroughly. Search and rescue operations must prioritize finding people on board.”

On Thursday, a team of 40 rescuers with Indonesian rescue helicopters headed towards Salak Mountain, a volcanic mountain range south of the capital, Jakarta where Superjet 100 vanished from radar screens.

“The Super Puma (helicopter) we deployed this morning has spotted the Sukhoi plane in the Cijeruk area. For the time being we can say nothing about its condition because it was sighted from far away in the air,” a military official said.

Although no immediate report has been revealed about the passengers, but families and relatives of passengers are at the airport in Jakarta mourning uncontrollably, waiting for information about their loved one.

It has been said that bad weather was the biggest hurdle in search for the plane that was expected to return in less than an hour, but dropped and air traffic control’s link was broken.

100-seat new passenger plane, Superjet is built by legendary Russian planemaker Sukhoi, an effort to boost country’s civil aviation industry, flight by two airlines, Russia’s Aeroflot and Armenia’s Armavia, but orders have been confirmed with more, including Indonesia’s Kartika Airlines and Sky Aviation, source reported.

The plan that said to be an influential player in the global aviation market was on the second of two demonstration flights when it disappeared in the remote Bogor region.

All the people on board were invited guests and included 36 were Indonesian airline and aviation executives, eight Russian crew members and five local journalists.