As of now, 8 prototype aircraft are being assembled simultaneously and four of them are already in late or final stages. 6 will be used for flight testing while 2 will be used for ground testing. 2 prototypes will be two-seater variants...
https://www.indomiliter.com/disepakati-sisa-pembayaran-proyek-kf-21-boramae-kfx-ifx-indonesia-cicil-selama-lima-tahun/
MoD were suppose to be communicating with MoF to came out with this kind of deal, right?
Not necessarily related to TNI AU, but okay...
KF21 is surprisingly bigger than F35, but why has less internal fuel?
"The KF-21 is also equipped with functions such as automatic posture recovery, automatic terrain tracking, automatic terrain collision avoidance, and automatic steering."
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