Harbin/Qingdao still brings benefits to the ASW role. Remember, part of their refits means they get the same standard modern bow sonar, TAS and VDS like everyone else. But compared to the 054A, they also get the sprint of gas turbines, which I suspect should be domestic by now, the original GE and Ukrainian gas turbines would and should have been replaced by domestic by now. They also have the advantage of having two helicopters, and 16 YJ-83 slant canisters, which you can replace some with YU-11 ASROC.
Recently they are spotted with the new circular SATCOMs, which means more electronic upgrades. As someone said, ships are more like network nodes now, regardless whether they are new or old hulls. The more nodes, the better.
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113 spotted in the SCS involved in ASW activity. This was taken a few months ago.
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Due to the limits of sonar ranges, in a sonar network, its better to have more nodes. This makes the light of the mass production of the 054A and 056A making sense.
There are more upgrades to these ships than people would look at the obvious, such as the radars and the short range SAMs. One not too talked about is that the ships has the Type 517 Yagis from the 052C/D. The Type 052 never had these before in its original configuration, they have the Type 518 L-band radar for long ranged search. The Type 517 did appear on the Type 051 Ludas, the 052 never had the original versions, and instead inherited the evolved 517s from the 052C/D. They can act as radar picket ships and use these radars to hunt for LO targets.
Another significant improvement is the installation of the Type 364 Sea Gull on the rear mast. Compared to the Type 364s installed on the Type 054A, the rear mast on the 052 is higher, which provides an extended radar horizon to spot for low flying threats. This radar is a big boost to the ship's defensive situational awareness.
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Not the least, both Harbin/Qingdao are fitted with the full Type 726 electronic warfare suite that's the same standard as the 052C/D. This includes the 726-1 ESM, 726-2 ESM which is used for directional finding, 726-3 ECM and the 726-4 DLS. So its soft kill defenses are as good as any 052C/D.
This configuration still makes the ships useful for now despite their age.
May I suggest to the moderators if they can move all related posts to the new PLAN MLU thread so we can continue there.