Russian Helicopters' Kazan factory is building a third prototype of a new model, the Mil Mi-38, which fits between the 36-passenger Mi-17 and the 82-passenger heavylift Mi-26.
The aircraft is designed to carry up to 40 passengers with a maximum take-off weight of 15.6t and payload of 6t carried internally or by sling.
Development has been held up by delays to a new Klimov engine, though this will be powering the third prototype, with Pratt & Whitney power having got the first two aircraft flying for evaluation by Russian Helicopters' Mil design bureau in Moscow.
© Russian Helicopters
Kazan plant manager Vadim Ligay says the aircraft is now on schedule to enter serial production "soon", and he expects Moscow to have the aircraft certified, with Klimov TV7-117V engines, in 2015.
The Kazan plant's main product is the Mi-17.