U.S. Expands F-35 Fighter Detection and Electronic Warfare Capability with APG-85 Radar.

The United States is moving to secure 67 production AN/APG-85 radars for F-35 fighters as the program works to align sensor availability with the pace of Block 4 aircraft production. The new radar is a central element of the modernization package, supporting detection, tracking, targeting and situational awareness in increasingly contested airspace.

Naval Air Systems Command awarded Northrop Grumman up to $123.8 million for long-lead material supporting the 67 radars for U.S. Air Force, Navy and Marine Corps F-35s. The contract does not cover the full cost of completed radar sets. Instead, it secures components that require lengthy manufacturing or procurement lead times, reducing the risk that radar production becomes a bottleneck for future aircraft deliveries.

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The AN/APG-85 radar is designed to give the F-35 longer-range detection, faster target tracking, improved synthetic aperture radar imaging and expanded electronic-attack capability, strengthening its ability to find, classify and engage advanced air and ground threats before they can respond effectively. (Picture source: U.S. Department of War/Defense)

The APG-85 is intended to replace the AN/APG-81 on U.S. F-35s configured for the newer radar. Detailed performance figures remain classified, but the sensor forms part of the wider Block 4 modernization effort intended to improve the fighter’s ability to detect, track, and engage advanced airborne and ground-based threats.

Radar availability has already affected F-35 production. Some aircraft have been accepted in interim configurations with ballast installed instead of their planned APG-85 radar, allowing deliveries to continue while those fighters await installation and testing of the new sensor.

That gap matters more for the F-35 because the aircraft depends heavily on sensor fusion. Its combat value comes not from stealth alone, but from combining radar, electro-optical sensors, electronic warfare systems, and external information into a single tactical picture for the pilot. A fighter delivered without its planned radar can therefore enter the inventory without the full combat capability expected from its intended Block 4 configuration.

The APG-85 transition is also closely linked to the wider Technology Refresh 3, or TR-3, modernization effort. TR-3 introduces a new integrated core processor, improved memory and updated cockpit systems designed to provide the computing capacity required for later Block 4 software, weapons and sensor upgrades.

Army Recognition has previously reported that the transition to Block 4 is placing simultaneous pressure on several parts of the F-35 industrial and sustainment system. Radar availability, computing hardware, software integration and weapons certification all need to progress at roughly the same pace if newly produced aircraft are to reach operational squadrons in their intended configuration.

This makes the latest APG-85 contract an industrial as well as a technical milestone. Ordering long-lead components years before final delivery lets suppliers secure specialized material, electronic components, and production capacity before complete radar sets are assembled.

For the three U.S. services operating the F-35, the main challenge is increasingly one of synchronization. Aircraft production can continue, but the operational value of Block 4 depends on sensors, computing hardware, software, and compatible weapons becoming available at the same time.

The planned 67-radar production effort therefore aims to reduce the gap between F-35 manufacturing and sensor availability, limiting the number of aircraft that require later retrofit before reaching their intended mission configuration.

As the U.S. F-35 fleet continues to expand, maintaining that alignment will become increasingly important. The APG-85 is not simply another component in the production chain; it is one of the systems that will determine whether future Block 4 aircraft arrive at operational units ready to deliver the level of detection, targeting, and survivability expected from the next stage of the F-35 program.

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Written by Alain Servaes – Chief Editor, Army Recognition Group
Alain Servaes is a former infantry non-commissioned officer and the founder of Army Recognition. With over 20 years in defense journalism, he provides expert analysis on military equipment, NATO operations, and the global defense industry.