Alliant Techsystems has been awarded a modification contract to a previously awarded firm-fixed-price, indefinite-delivery, indefinite-quantity contract to exercise an option for AN/AAR-47 missile warning system weapons replaceable assemblies.

Under the $32.4m contract, Alliant will provide 1,700 assemblies that include 600 A(V)2 and B(V)2 integrated optical sensor convertors, 200 A(V)2 and B(V)2 computer processors and 100 A(V)2/B(V)2 control indicators.

The systems will be installed on US Navy, Marine Corps, Air Force and other services, as well as various foreign military helicopters, rotorcraft, and low/slow fixed wing aircraft.

Work will be performed at the company’s facilities in the US, Japan and Israel and is expected to be completed in January 2014.

The US Naval Air Systems Command will be the contracting activity.