The U.S. Army awarded General Atomics Aeronautical Systems Inc. a $47.5 million contract modification that pays for engineering changes to the Army’s improved Gray Eagle unmanned aircraft.

The Gray Eagle is GA-ASI’s Predator aircraft adapted for Army use.

Work will take place over three years and take place in Poway, the Pentagon reported on Sept. 22.

The change applies to 19 aircraft, four lots of ground-support equipment and one lot of unique initial spares.

The Army Contracting Command of Redstone Arsenal, Ala., awarded the deal.