TY JOUR TI Impact of Certification of the MC-21-310 Aircraft with the PD-14 Engine on the Project and Its Economic Significance KW MC-21 KW PD-14 KW import substitution KW certification KW civil aircraft industry KW cost KW serial production KW economic efficiency JO Journal of Applied Research AU Rodionova, Y.I. AU Krasnikova, K.D. AU Anvarova, D.R. PY 2026 IS PB ITBO University