ATK wins contract to produce MK90 propellant grain

US aerospace and defence company ATK has received an $80m (£47.9m) order from General Dynamics Armament and Technical Products for production of the MK90 propellant grain, which provides propulsion for the MK66 rocket motor, a key element of the Hydra 70 rocket system.

The Hydra 70 rocket system is used on a variety of fixed-wing and rotary-wing platforms, including the AH-64 Apache, the UH-60 Black Hawk and the A-10, and has been used extensively in both Iraq and Afghanistan.