The most significant improvement of Type 722 II LCAC over the original Type 722 is in its propulsion system. In 1983, an indigenous Type 409 gas-turbine engine based on the WJ-6 (WJ = Wo-Jiang 涡浆) turboprop aero-engine was successfully developed, and it was decided to adopt it for the Type 722 II LCAC. Because this was the very first time a gas-turbine engine was adopted for LCAC, many tests were needed, which protracted the time. It was not until three years later in 1986 when all land-based tests for the Type 409 gas-turbine engine were completed, and then installed on the boat in the following year. Finally, in 1989, the first Type 722 II LCAC was completed and entered the service in the same year. The Type 722 II LCAC received NATO reporting name Jinsha II class LCAC.
