High Quality Content by WIKIPEDIA articles! A heavily-upgraded version of the Al-31F is being developed for the Su-35BM prototype and possibly to power the early flights of PAK-FA. This engine has been named the AL-41F1A. It is important to note that the AL-41F1A is not considered a part of the same AL-41 line as was planned for the Mikoyan Project 1.44 because it uses the core of the AL-31F, whereas the AL-41F utilizes an entirely new core. The designation appears to be present because the engine approaches the projected specifications of the new AL-41F class. It is also notable that the engine is capable of mounting 3D thrust vectoring nozzles for extra manoeuvrability.

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