An-148 to refine performance

http://www.flightglobal.com/articles/2010/07/29/345557/vaso-takes-back-rossiya-an-148-to-refine-performance.html

Russia's first serial production Antonov An-148 is to be transferred back to airframer VASO in Voronezh to undergo modification in a bid to improve the type's performance.

The aircraft, registered RA-61701, is one of four in service with Rossiya. It is being flown back to VASO today where, the airframer says, it will spend six weeks to two months being refined.