At the core of this system is IRST21, a long-wave infrared search-and-track sensor designed to passively detect airborne targets well beyond visual range. The system improves reaction time and survivability by allowing Naval Aviators to track threats without relying on radar emissions, making it an essential capability in contested airspace.
The IOC declaration follows successful Initial Operational Test and Evaluation (IOT&E) conducted by Air Test and Evaluation Squadron (VX) 9. Throughout the past year, the F/A-18 and EA-18G Program Office (PMA-265) collaborated with military, civilian, and industry personnel from VX-31 and VX-23 to leverage a combination of operational and developmental testing facilities, ensuring the system’s performance in real-world conditions.
Rear Adm. John Lemmon, Program Executive Officer for Tactical Aircraft Programs, highlighted the importance of IRST21 in delivering advanced warfighting capabilities to the fleet. He stated that the passive infrared system enhances aircrew survivability, particularly in radar-denied or heavy electronic warfare environments, where traditional radar-based sensors might be disrupted.
Capt. Michael Burks, PMA-265 Program Manager, credited the hard work and resilience of a collaborative team of government and industry professionals for successfully bringing IRST21 to operational status. He emphasised that the sensor acts as a complementary system to the AN/APG-79 fire control radar, supplementing air-to-air detection and guiding beyond-visual-range missiles.
The IRST21 Block II system represents the second phase of an evolutionary acquisition approach. Block I, introduced in 2011, integrated an existing IRST system onto the F/A-18 fuel tank, and in 2019, the fleet began operating it during an early deployment. Block II features an improved sensor, upgraded processor, and enhanced software, with the first operational deployment planned for 2025.
A full-rate production decision is expected in spring 2025, allowing the U.S. Navy to begin equipping its carrier-based F/A-18E/F Super Hornet squadrons with IRST Block II. Hank Tucker, Vice President of Mission Systems at Lockheed Martin, stated that passive sensing technologies like IRST21 are transforming air combat operations, keeping pilots ahead of evolving threats.