Type 80 23mm AAA gun in its predecessor, resulting in the new SG-II ADS. Like its predecessor, SG-II ADS is also a towed system and uses all other subsystems of its predecessor with the exception of the gun. Because TY/DY-90 is a fire and forget weapon, no modification is needed for the fire control system of the original SG ADS. Hunter air defense system During the 5th Zhuhai Airshow held at the end of 2004, a mobile land-based air defense variant of TY-90 was revealed, dubbed as LS ADS, short for Lie-Shou (猎手, meaning Hunter) Air Defense System. Eight TY-90 in two groups of four are mounted in the back of a Dongfeng EQ2050, and the fire control system consists of electro-optics including laser, IR & TV, mounted between the two quadruple launchers. The LS ADS is developed by Norinco, with Dongfeng Motor Corporation as the subcontractor to develop the chassis (vehicle). LS ADS is capable of being air transported, including being slung under helicopters. The system is operated by a team of two, one driver and one weaponry system officer. The system can also be integrated into a larger air defense network. A small number subsequently entered PLA service for evaluation purposes. Type 92 Yitian The TY-90 has mounted on the WZ-551 armored personnel carrier as an air defense vehicle for mechanized forces. In 2005, this mobile land-based air defense system was revealed to the Chinese public, called Yi-Tian () Air Defense System, or YT ADS. The weaponry includes eight TY-90 missiles, QJC-88 12.7 mm heavy machine gun, and 2 sets of 4 smoke grenade dischargers. WZ-551 is the chassis of the Yi-Tian air defense system, giving the system amphibious capability and added protection. Additionally, a light solid-state 3-D passive phased array radar is added to the fire control system, just above the original electro-optical fire control system, providing the ADS with a greater surveillance range. The radar can be folded down for traveling and transportation. Specifications: Maximum target altitude: 4 km Minimum target altitude: 15 meter Maximum target range: 6 km Minimum target range: 300 meter Maximum target speed: > 400 meter / second Maximum radar searching range: >20 km Maximum radar tracking range: 10 – 12 km System reaction time: 6 – 8 seconds Specifications (TY-90) For air-to-air version: length: 1.9 meter diameter: 0.09 metre weight: 20 kg warhead: 3 kg Maximum g-force: 20 g guidance: infrared