TY-90 () is a Chinese air-to-air missile specifically developed for attack helicopter dogfights. Contrary to the erroneous claims, the missile is not developed from MANPADS missiles, but instead, it is specifically designed as an air-to-air missile from to engage in helicopter combat. Design and development Chinese determined that the MANPAD missiles converted for helicopter dogfights were not adequate, so a brand-new air-to-air missile specifically for helicopter use was sanctioned, and TY-90 was the resulting product. The warhead of the missile is specially designed to sever the rotary wings with a single shot, and the missile has all-aspect attack capability. The missile is designed to ensure a single shot would be sufficient to down an opposing attack helicopter or at least knock it out of action. At least three additional versions have been developed in addition to the basic version, two of them being air-to-air versions. The first adopts a dual-band guidance, adding UV to the original IR, while the second adopts an Imaging IR (ImIR) guidance. During the 5th Zhuhai Airshow held at the end of 2004, a ground-launched air defense version appeared, with the designation of DY-90, which was essentially the original TY-90, but with an additional option of incorporating a rocket booster to increase range upon customer's request. A naval surface-to-air version is also developed, utilizing the FLS-1 system and the basic version with IR guidance, thus providing a fire-and-forget capability in comparison to the case where QW-3 is used. However, this naval version has not entered service as of 2008, and the reason is reported that the Chinese military wants to wait until the more advanced dual-band or ImIR version can be incorporated into the FLS-1 system, which was under development. However, at Zhuhai Airshow, AVIC I, the developer of TY-90 only acknowledged the development and active marketing of such systems, but refused to further confirm whether the Chinese military or any foreign customers had placed any orders, and neither did the developer confirm such developmental works were privately funded by the developer or received any funds from the state or foreign customers. Variants SG-II ADS In 2004, a land-based air defense variant of TY-90 is revealed to the Chinese public after entering Chinese service in small numbers for some time. Shengong (Deity Bow, 神弓)-II Air Defense System (SG-II ADS) is the upgrade of its predecessor SG ADS, with a quadruple TY-90/DY-90 missile launcher replacing the original