OK I finally decided to join a discusion
Aero L-59 is just L-39 with Lotarev DV-2 engine and improved fuselage so called "Super albatros". Currently serving with Egyptian and Tunisian airfoces. Since they are both jet trainers they don't have any RWR system.
I guess you mean Aero L-159 ALCA which is meant to be a light, low cost CAS aircraft and therefore it comes with "full package" a-a, a-g radar amd RWR