Aero successfully conducted L-39NG basic weapons tests | AERO Vodochody AEROSPACE a.s.

https://www.aero.cz/en/media/news/aero-testing/ 

During one of a series of tests that the new L-39NG jet aircraft from Aero successfully passed, engineers and pilots tested the use of weapons. They fired 230 missiles and dropped nearly 70 bombs to test engine effects, emergency load shedding, and accuracy.