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Very strange, compared to a KJ-500, the radar seems to be installed facing the wrong way. Now one of the arrays directly points into the vertical tail which is a very strange design choice to make.
I think the reversed facing might be a result of evolving tactics in the face of increasingly dangerous threat environments AWACS are now operating under, as well as potentially different intended primary mission profiles.
The original forward facing tri-array design made sense when BVRAAM engagement ranges barely stretched into triple digit KMs and stealth aircraft were still very rare. The forward facing array was also optimised to support primarily offensive air combat operations where your tac air combat packages are pushing into enemy territory and your AWACS’ want to keep up with them to provide continued support without risking being outrun too much that they could no longer effectively provide their support services.
A rearward facing array OTOH allows the AWACs to maintain optimal radar performance when approaching the engagement zone at an oblique angle instead of directly towards it. That gives it more time before it needs to perform a course correction to avoid getting too close, and also makes it quicker for the AWACS to turn tail and run if danger approaches. This sort of flying is most suitable for defensive minded operations where your tac air assets are trying to hold a line to prevent opfor from crossing.
Additionally, the rearward facing also allows for optimal radar performance when the AWACS is moving away from the engagement zone as fast as possible, whereas the 6 o’clock position would be the angle of both worst radar performance on a traditional front facing array, as well as the most common angle from which opfor VLO assets and missiles are most likely to approach from when trying to kill the AWACS.
My guess is that the PLA was seeing front facing tri-array AWACS getting killed far too often for their liking in mock combat exercises and wanted to directly address that issue.