All three crew members are dead after a Sukhoi Superjet airliner crashed during a test flight following maintenance work near Moscow on Friday, according to civil defence authorities. The plane had taken off from Zhukovka airport outside the capital for a test flight and crashed near the town of Kolomna, located about 80 kilometres south-east of Moscow. There were no passengers on board, the authorities said. The plane belonged to the state-owned gas company Gazprom, news agency TASS reported. The test flight had taken place after scheduled maintenance. No details of the cause of the crash hav…