Sikorsky Aircraft Corp. has agreed to a $3.5 million settlement with federal authorities last week over allegations that the helicopter maker violated federal law in inflating the costs of spare helicopter parts it sold to the Army.

The Stratford-based manufacturer of Black Hawk helicopters and spare parts for the U.S. military and other nations allegedly violated the False Claims Act over the pricing of spare parts. The repair work involving the spare parts was mainly performed at the Corpus Christi Army Depot in Texas.