The U.S. Department of Commerce said it would impose preliminary anti-dumping duties of 79.82% on Bombardier Inc.'s 100- to 150-seat civilian aircraft imported from Canada.
The latest action followed the department's decision last week to slap countervailing duties of 219.63% on imports of the same Bombardier aircraft. The punitive duties were triggered by a complaint from Boeing Co. that Bombardier dumped aircraft in the U.S. at low prices and received unfair subsidies from the Canadian and U.K. governments.
"The United States is committed to free, fair and reciprocal trade with Canada, but this is not our idea of a properly functioning trading relationship," Commerce Secretary Wilbur Ross said, adding that the government will continue to verify the accuracy of its latest decision.
The department said it will announce its final decision on the anti-dumping duties on Dec. 19.
In a statement, Canadian Foreign Affairs Minister Chrystia Freeland said she was "extremely disappointed" by the latest penalties that "unfairly target" Canada's aerospace sector.