Developing SJ100 flagship project is a key goal in import substitution program in domestic aircraft engineering. TsAGI (a part of NRC “Zhukovsky Institute”) is actively involved in creation and upgrade of the new jet developed by Regional Aircraft, a branch of Yakovlev PJSC.

TsAGI is involved in each research area related to development of the aircraft. It carried out research in aerodynamics, strength, flight dynamics, aeroacoustics, etc. So far, research cycle has been completed under Yakovlev PJSC’s request to improve flight and operational performance of the jet. TsAGI has already solved a number of issues linked to the integrated control system of SJ100. Apart from that, TsAGI determined aeroacoustic loads, vibration control methods for high-lift systems and fuselage parts, and studied air data system within the project.

Many studies were completed for the jet’s strength. TsAGI did integrated research and tests aimed to provide lifecycle of the tail, fin, and engine/wing area. To analyze aircraft structural takeoff-and-landing dynamic loads, TsAGI did model tests in the configuration close to the real one at landing.

Aircraft certification tests are a milestone of the work. Activities are being carried out to confirm lifecycle performance of SJ100, whose wingbox was delivered to TsAGI.

The tests should provide experimental data on high-lift fatigue strength and damage tolerance, and to verify the design adequacy. The high-lift system will be subject to multiple cyclical loadings to verify the life limit equal to 54 thousand flights. According to preliminary assessments, it should take about five years.

Currently, TsAGI is carrying out front-end engineering and design activities. Then, Yakovlev will complete the final assembly of SJ100 high-lift system and will install the mounted parts. The tests are to start in 2025.

‘The tests should confirm structural strength of wing units for the operational lifecycle, and reveal new data for structural analysis. Such studies will shape the understanding of wing structural behavior within the entire lifecycle of the aircraft,’ said Mikhail Zichenkov, Deputy General Director and Head for Aircraft Strength, TsAGI.

SJ100 is an import-substituted version of RRJ-95 (SSJ100) short-haul jet created by Yakovlev PJSC under import substitution program.