Jacobs Engineering Group Inc. on Tuesday said it won a nearly $35 million contract addition for aerospace testing and facilities operations and maintenance at the NASA Ames Research Center in Northern California.

The funding will allow additional testing as well as for maintenance and repairs on wind tunnels and other facilities at the Ames center at Moffett Field.

The total value of the contract, which extends to July 31, is $124 million.

Jacobs has been providing these contract services to NASA Ames since 1998.

Jacobs shares were down $4.29, or 7 percent, to $58.01 in morning trading on the New York Stock Exchange.