Type 500 training mine was jointly developed by Fengxi Machinery Factory (汾西机器厂) and the First Division of the People’s Liberation Army Naval Air Force. This training mine is very similar to the Training-1 training bottom mine except that Type 500 training mine can be planted by aircraft. It is used to train pilots to drop mines into the ocean. Like the Training-1 training bottom mine, this mine can also be rapidly converted into live round by adopting warheads on regular mines.
References
Type 500 training mine Wikipedia(Text) CC BY-SA