APR-39

The AN/APR-39 threat warning system is a radar warning receiver that also can be the control computer for an overall electronics warfare suite. In various versions, it is deployed on transport, special operations, electronic warfare and attack helicopters, as well as some tilt-rotor and fixed-wing aircraft. Developed for the U.S. Army, it is used by a number of countries; the latest version is the AN/APR-39A(V)2.

It can interface with the AN/AVR-2 and AN/AAR-47 laser warning receivers, AN/ALQ-136 pulse radar jammer ,and AN/ALQ-162 continuous wave radar jammer. It can use the AN/ALE-47 expendable dispenser and towed decoy controller, although the ALE-47 is the suite controller on a number of higher-performance aircraft.