RuAviation

Yakovlev PJSC together with specialists from the Moscow Institute of Electromechanics and Automation (MIEA) have completed the development of algorithms for the automatic control system (ACS) as part of the integrated control system (ICS) of the SJ-100 aircraft for automatic and director flight control, as well as engine thrust control. This was reported in the press service of Yakovlev.

‘The created algorithms fully correspond to those implemented on modern passenger aircraft and allow performing such tasks as director control at takeoff and fully automatic control at all other stages of flight. The peculiarity of the new development is in the algorithms of automatic landing according to Cat IIIB category. It assumes automatic control at the stages of levelling and landing, as well as maintaining the direction of the aircraft along the centreline of the runway,’ the report says.

During director, semi-automatic control, the control system generates a mismatch signal relative to the specified trajectory, and this signal is fed to the multifunctional indicator, and the pilot, focusing on the position of the director control slats and moving the side handle, fully controls the rudders, seeking to maintain a stabilised position of the aircraft in pitch, yaw and roll.

To test the SJ-100 aircraft’s on-board equipment, a semi-natural test stand Electronic Bird is used, which was created by GosNIIAS specialists under a contract with Irkut Corporation in 2022. Previously, a similar stand was developed for the SSJ100 aircraft. Its use significantly speeds up the process of development and testing of algorithms and software for automatic control systems, allows testing new equipment, simulating system failures and practising crew actions in abnormal situations. The developed algorithms of the autopilot and thrust automaton were tested on such a stand.

GosNIIAS and PJSC Yakovlev developed and integrated the SJ-100 Electronic Bird test bed

As part of the SJ-100 certification, Yakovlev engineers are conducting statistical modelling of automatic landings using mathematical models for Cat IIIA and Cat IIIB ICAO categories. The research involves performing more than 2 million landings with a random distribution of initial conditions.

‘We have successfully conducted preliminary tests of the UAS, implemented as part of the ICS, on the E-Bird integration testbed with the participation of engineers and test pilots. The next stage is to install the system on the aircraft and conduct flight refinement and certification tests,’ the Yakovlev press service quoted Kirill Kuznetsov, chief designer of the SJ-100, as saying.

To complete the certification programme and start commercial operation, the SJ-100 aircraft should perform about 200 test flights in 2025. The head of the Ministry of Industry and Trade Anton Alikhanov told about it in an interview with Rossiya-24 TV channel in September 2024. The type certificate for the import-substituted Superjet is expected to be obtained in December 2025.