Sales of Neptune helicopters in the United States

Equipment: By the end of 1987, there were more than 300 military S-6 1 in various services and arms of the United States, and more than 600 were used in other countries.

Funding: SH-3/S-6 1 unit price1$10,000 (ex-factory price 1984) produced by Mitsubishi Heavy Industries of Japan.

By the middle of 1980, Sikorsky Aircraft Company had manufactured more than 750 S-6/kloc-0 military and civilian helicopters of various models, and more than 350 helicopters were manufactured by other countries according to licenses. The United States stopped producing S-6 1 series helicopters in June, 1980, and the S-6 1 helicopters patented by Italian Agusta Company, British westland Helicopter Company and Japanese Mitsubishi Heavy Industries Company also stopped production in the late 1980s. Japan produced 185 S-6 1 helicopter.