5th December 2017: Sukhoi T-50-2 prototype (called Т-50ЛЛ = T-50LL Flying Laboratory) piloted by Syergyey Bogdan had performed first test flight with installed one new-generation engine "product 30", intended to replace first stage engine product 117 (AL-41F1). Engine will be produced by ОДК Объединенная двигателестроительная корпорация (United Engine Building Corporation) which integrated all main Russian engine's producers: Moskov Machine Production Enterprise, Klimov, UMPO, Kuznyetsov, Saturn, Aviadvigatyeli, Star, NPP Motor, Perm Engine Plant, Metallist-Samara.

December 2017: Т-50ЛЛ (T-50LL Flying Laboratory) with engine 30.
Prototype T-50-2 is very fatigue now, with parts "borrowed" from other prototypes and traces of reworking.

2020: Prototype T-50-2 is very fatigue now, with parts "borrowed" from other prototypes and traces of reworking.