Northrop Grumman Company’s ALQ-251 radio frequency countermeasure (RFCM) system has been delivered to U.S. Particular Operations Command (USSOCOM) as a part of an AC-130J plane improve. The ALQ-251 will present superior situational consciousness and safety in opposition to digital warfare methods and radar-guided weapons in contested and congested electromagnetic spectrum environments. The Sierra Nevada Company is the integrator for the AC-130J and MC-130J RFCM program.

The Sierra Nevada Company was in July 2020 awarded a USD700 million contract by U.S. Particular Operations Command for the procurement and integration of ALQ-251 radio frequency countermeasure methods onto AC-130J Ghostrider and MC-130J Commando II plane. In a 1 March assertion, the corporate mentioned that the primary AC-130J plane upgraded by way of the engineering and manufacturing improvement programme part could be used to help developmental and operational testing.


The RFCM system, which offers risk detection, precision geolocation, and lively countermeasure capabilities, is a part of the defensive countermeasures suite that gives the situational consciousness and risk response processing required for SOF missions. Northrop Grumman has made little public on the AN/ALQ-251 system apart from to say that it’s based mostly on a modular, open methods structure and combines radar warning, risk identification, and lively countermeasure capabilities.

Northrop Grumman’s open methods EW structure affords the bandwidth wanted to detect and defeat essentially the most subtle RF threats, together with agile air protection methods. Shared throughout the corporate’s household of EW methods, which incorporates capabilities for fighters, airlifters and rotary wing plane, this pioneering know-how can defend just about any platform or mission. Northrop Grumman is offering the ALQ-251 radio frequency countermeasures system for the Particular Operations Command AC/MC-130J tactical airlifters. The operators of those giant plane will profit from the power to maneuver safely in extremely contested spectrum environments.

SNC has accomplished the primary AC-130J Ghostrider RFCM embodiment for U.S. Particular Operations Command. (Photograph by Sierra Nevada Company)