It would also mean the Chinese would have access to NATO systems since the Turks would want the systems to be integrated.
Unlikely, NATO and the US would never allow that. Remember America got awfully sniffy at the idea of PLAAF Su27s holding joint exercises with F16s. They don't even allow Turkish engineers full access to the equipment they sold to Turkey (all those black boxes) never mind Chinese ones.
I think that may be a factor in why China won this bid, and I think its pretty much guaranteed that the PLA would not allow anything too sensitive to be releases that might jeopardise the effectiveness of their own HQ9s. In addition, if we follow the trend set by previous Chinese weapons sales, it would also strongly hint that a HQ9 follow on system has either been developed or is not too far from it if they are making HQ9s available for export.
Going back integrating the HQ9s into the existing and planned future Turkish AD network, the HQ9 win points to two possibilities.
1) The HQ9 is only just the first step, and Turkey is planning to move away from a western based AD network to an indiginous one with possibily major Chinese components. If that is the case, we could expect maybe additional major wins for other Chinese systems ranging from radars, underground fiber optic networks, C&C centres and maybe even stuff like AWACS and fighters.
Politically, this is actually not as unlikely as it may appear because there is growing dissatisfaction in Turkey about the foot dragging over its EU membership application and many US foreign policy moves in recent years. Without the unifying external threat of the USSR, and full EU membership looking increasingly like a false promise, there just isn't a great deal to bind Turkey to NATO's orbit these days.
In this context, it would not be out of the question for Turkey to want to pursue a more independent foreign policy and start getting closer to the rising economic and military power, especially when it looks like the US and EU are stagnating or even on the decline. At the very least, the threat of Turkey re-aligning itself would turn on the heat in Washington and Brussels, and America might feel obliged to put pressure on the EU to move forwards with Turkish membership least Turkey gets pulled into the orbit of their rival.
2) That the HQ9 deal involves significantly more ToT than mere local assembly from knock down kits. This could solve both Turkish integration issues and also PLA security concerns if the HQ9 variant on offer was less an off-the-shelf dumbed down version of the PLA's HQ9s, but more of a brand new system that uses the HQ9 technology but which is tailor made for Turkey along similar lines as the JF17 for Pakistan. The close relations between Turkey and Pakistan, and the great experience Pakistan has had cooperating with China on the JF17 may have also been a factor which influenced this Turkish decision.
Turkey would have full access to all the technology, source codes and the actual systems themselves with no black boxes. Not only would this give Turkey full confidence in the security and reliability of the systems, but it would also allow full customisation and integration with anything else Turkey has similar access to.
China would also benefit from this arrangement in that by allowing Turkey to make the system fully their own, it also gives Turkey a huge incentive to protect the secrets of the weapons system because those secrets are also Turkey's own secrets. And even if NATO got access to the HQ9s (if the systems sold to Turkey could still be called that), they would only know how to effective jam and counter those Turkish systems.
