Russian airframer Irkut has undertaken buffet analysis of its new MS-21 through aerodynamic windtunnel testing in Moscow.
The testing on a model of the twinjet's -200 variant has been conducted by the Central Aerohydrodynamics Institute.
It involved a series of low-speed tests on MS-21 departure and arrival configurations, with various angles of attack ranging up to 21°.
The institute says sensors attached to the model enabled it to gather data on vibration modes of the elevators and rudder as well as the flaps.
It adds that its specialists will analyse the results to determine vibration sources and examine options on methods to "mitigate this dangerous phenomenon".