SEATTLE -- A Dutch arms dealer was sentenced to 10 years in prison yesterday and fined $250,000 for trying to buy Navy torpedoes and a classified manual so he could sell them to China.

Johannes Nootenboom, a Dutch national, was convicted in U.S. District Court May 11 of trying to buy a classified manual for the Navy's Mark 48 torpedo and of conspiring with another Dutch national to sell the manuals and torpedoes to China without an export license.

Nootenboom, 46, was arrested Feb. 19 at Seattle-Tacoma Airport after he tried to pay an undercover Customs Service agent $10,000 for a copy of the manual.

Nootenboom told the undercover agent he would pay $2.4 million for four torpedoes, which he planned to smuggle out of the country, according to court documents.

The second Dutchman, Henk Smits, was indicted by a federal grand jury in April on the conspiracy charge and is believed to be somewhere in the Netherlands.

In Miami, two residents of Great Britain were indicted on charges that they tried to supply the Soviet Union with a computer capable of determining whether military weapons will strike their targets.

The computer, called a Sentry Test Head and valued at $43,000 in the United States, was seized by U.S. Customs agents in June at Miami International Airport.