
The L-15B variant has a larger nose, which houses an indigenous passive electronically scanned array multi-function radar with a range of around 75 km (46.6 miles). It reportedly would give the L-15B high performance in strike and air combat missions.
Other distinct differences are identification friend or foe antennas at the front of the canopy, likened to those found on F-16 and F-18 fighters, and a radar warning receiver on the vertical stabilizer. It is also rumored by Chinese media that the L-15B has replaced the Arinc 429 data bus standard in favor of the Chinese HB6096-SZ-01 standard, which is said to be simpler, stable and less subjected to interference.
Nanchang-based Hongdu Aviation has increased weapon hard points on the L-15B from seven to nine, with a maximum payload of 3.5 metric tons. A sample weapon configuration could be PL-12 radar-guided beyond visual range missiles, LT-2 laser guided bombs and a centerline cannon pod.