An official says air controllers have lost contact with a Russian-made plane carrying 46 people in western Indonesia.
National search agency spokesman Gagah Prakoso says the Sukhoi Superjet-100 was on a demonstration flight on Wednesday when it lost contact with authorities near Salak mountain in West Java province.
He says a rescue team has been dispatched to area.
The aircraft took off from Jakarta's Halim Perdanakusuma Airport at 2pm (07.00 GMT) and was scheduled to return 50 minutes later.
The civilian plane, developed by the Russian aerospace company Sukhoi in co-operation with Western partners, made its maiden flight in 2008 and is now being demonstrated in the region. - Sapa-AP