Sikorsky, owned by United Technologies, beat a rival bid by Italy's AgustaWestland, owned by Finmeccanica .

Defence Minister Vecdi Gonul said the decade-long project could eventually become far larger.

"At first stage, 109 helicopters will be supplied, but this can increase up to 600 helicopters during the 10-year term of the project," Gonul said.

"The project will be worth around $3.5 billion. The schedule of supply will be determined in the coming period," he added.

He said Turkish aerospace firm TUSAS will produce several parts for the helicopters.

The helicopters, which would be used by Turkish armed forces and the police, are part of a drive to modernise the country's defences.

Shares in Sikorsky's parent United Technology rose 0.2 percent to $86.11 in early trading in New York.