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Looks that air station in ETC has become the “recycling center” for Su-30MKK/Mk2s from various units around the country while those units themselves are receiving new aircraft like J-16.
I've heard rumors that J-11BG is not a comprehensive upgrade but just an antenna upgrade (Not even a full radar upgrade), which means it still uses the old backend paired with a new antenna like the APG-63(V)2 and possibly a software update to allow it to probably carry the PL-15 (?, as no evidence of it has emerged). Engines are upgraded but I doubt it's on purpose as it is more likely that the original AL-31F were worn out and were just replaced by WS-10As to simplify logistics neither was the avionic suite overhauled.J-11BG upgrade is such an important but overlooked part of PLAAF fighter modernisation. It's not as glamorous as 6th gens and new 5th gen variants but this is bringing over a hundred previously BVR weak (in the modern era, actually BVR incapable) J-11B into Su-35S BVR level.
Giving the J-11B a modern, third gen AESA and PL-15 integration was always needed. Surprised it took them this long to get to it. We are at around 450 5th gens produced for PLAAF and PLANAF. Overcapacity has its upsides![]()