Not much is known about this trainer Jastreb, except that it first flew with the Yugoslav Air Force as 23507 and from 1992 with the Serbia and Montenegro Air Force. It ended up in the storage area of the Muzej Vazduhoplovstva Beograd where it was first noted in Jun-1997. Behind it are J-21 24208 and IJ-21 24418, the fins on the left are front to rear NJ-21 23506, and J-21s 24130 and 24122, the ones to the right are J-21s 24214 and the nose of 24142.

Jastrebs rotting away behind the Aeronautical Museum. The two-seat NJ-21 or TJ-1 model is similar to the earlier G-2 Galeb trainer.