ATAK-2 and AW-249 are almost completely different helicopters. Engine, transmission, flight avionics and interfaces, CMS and weapon systems etc. are completely different. Moreover, the design philosophy of helicopters are also different. While the Italians will focus on the logic of gaining an economical platform as much as possible with an MTOW below 17,000lb, SSB side focused on more heavy platform that will be directly in the class of AH-64 and KA-52 heavy armored attack helicopters, which will have over 24.000lb MTOW.
The other issue on the SSB side is about industrial ownership.
The ATAK-1 program was a project progressing in Italian AW partnership. This partnership agreement allowed the use of Turkish avionics on the platform, and customizations and improvments at the disposal of the SSB. In addition, the export rights of this platform were also on the Turkish side. However, it was basically a more advanced variant derived from the AW-129, although it had a lot of customization.
The ATAK-2 program, on the other hand, is a platform where experience and abilities gained from ATAK-1 are used, but its industrial rights are entirely owned by the SSB, so indigenous project.
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Regarding the TS-1400, it is currently in the EASA certification process. TEI TS1400 is currently preparing for civil aviation and so fitted to a utility helicopter, aka GOKBEY. There is a certification process we call CS-E. You have to keep everything under control, from the diameter of the dust particles that will enter the engine, to the amount of ice that will form inside, to the amount of Nitrogen-Oxide that the engine will oscillate. For this reason, all of these subsystems go through a detailed and rigorous testing process. All of these processes continue according to certain standards and it takes a certain process to complete them.
TEI plans to sell this engine in significant quantities worldwide. Therefore, the preparation continues not only for the military field, but more predominantly for the civilian field.
For military purposes, IMO the engine is already ready. However, how long it will take to integrate this engine into the T-129, different dates can be speculated on this issue. If there is an urgent need, which is clear, Pakistan army could start to receive these variants in less than two years.