According to The Jakarta Post an ATR-42-300 has lost contact over Irian Jaya.
The missing plane is PK-YRN from Trigana Air.
It was on a flight from Jayapura to Oksibil.
54 people are on board, search and rescue missions have already started.
source:
http://www.thejakartapost.com/news/2015 ... board.html