The J-11A Flanker-B+ is a Chinese licensed copy of the Su-27SK from Russia (Unlike the J-11B which wasn't). So do the PLAAF still use the J-11A (If so, with AL-31s or WS-10s?)
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2$\begingroup$ The J-11A was not a licensed copy, it was a joint assembly project. China tried to sell internationally but the engine performance leaves much to be desired. The J-11B is an illegal copy of the -11A, in keeping with China's bad habits of stealing IP from other countries. $\endgroup$– Juan JimenezMar 27 at 18:07
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$\begingroup$ @JuanJimenez J-11 was a licensed copy of Su-27SK that was divided into two parts. Part A was to assemble locally with Russian parts, which last from 1996 to 2007 (first deliver of parts in 1996, first flight in 1998). Part B was to use locally made parts and started as soon as technical materials was received. The first B model took flight in 2003 and is in production till this day. If B were an illegal copy why would Russia have supplied engines and other parts for it for 20+ years? $\endgroup$– user3528438Aug 29 at 2:25
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$\begingroup$ @user3528438 It's what happens when you get caught making illegal copies. You ask for forgiveness after the fact and pay a license fee. Had China had the ability to produce good engines that would probably not have happened. $\endgroup$– Juan JimenezAug 29 at 13:05
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$\begingroup$ @JuanJimenez If it's all that simple then I'll start making illegal copies of everything myself. $\endgroup$– user3528438Aug 29 at 14:48
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$\begingroup$ @user3528438 Knock yourself out, but make sure you lawyer up first. $\endgroup$– Juan JimenezAug 29 at 15:36
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The PLAAF still uses the J-11A. Some J-11As received some new missile approach warning systems and some upgrades to the fire-control system back in 2015 but since the J-11A is just a Su-27 assembled in China, even the upgraded J-11As probably still use the AL-31 engine.
Edit: The first 100 J-11s built use the AL-31, but the rest use the WS-10A.
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1$\begingroup$ Oh, ok. So are they still unable to carry the PL-8 and PL-12 Air-to-Air missiles? $\endgroup$ Mar 28 at 14:20
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1$\begingroup$ So they were changed to carry PL-10s but not PL-8s or PL-12s? $\endgroup$ Mar 29 at 1:26
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1$\begingroup$ So do the Chinese still use the AA-11 Archer AAM or has it been totally replaced by the PL-10? $\endgroup$ Mar 31 at 1:39
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1$\begingroup$ Okay, so they literally still use the old cockpit of the Su-27SK? If so that's interesting. $\endgroup$ Apr 4 at 14:55
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1$\begingroup$ The J-11As were literally just Su-27SKs sold to China as kits. Given that the J-11B is a reverse-engineered version of the J-11A / Su-27SK, it wouldn't be that surprising if China reused the Su-27SK cockpit. $\endgroup$ Apr 4 at 17:32