Alliant Techsystems (ATK) has received a $21 million production contract from the Naval Air Systems Command, Patuxent River, Md., for additional AN/AAR-47 Missile Warning Systems and sensor upgrade kits.

The contract represents the fourth production option to ATK's existing sensor upgrade contract first awarded in 1998. The kits and systems will be delivered to the U.S. Navy, U.S. Air Force, and U.S. allies for integration into various aircraft.

"The AN/AAR-47 system is a battle-proven missile warning system that quickly can become an air crew's best friend in combat," said Dave Wise, president of ATK Missile Systems.

"ATK sensors are ideally suited for identifying the distinctive plume of surface to air missiles. While primarily deployed on military aircraft, the AN/AAR-47 system is equally capable of providing protection for America's commercial aircraft fleet."

ATK Missile Systems, Woodland Hills, Calif., will conduct work under the contract at its facility in Clearwater, Fla.

The AN/AAR-47 system is an electro-optical missile warning system for low, slow-flying aircraft. It detects missile launches, from a variety of missile sources, as well as laser-guided and laser-aided threats.

The system immediately provides a signal to dispense appropriate countermeasures and displays identified threats to the pilot in the cockpit. The improved sensor technology awarded under this contract greatly increases the probability of detection while significantly reducing the false alarm rate.