US P-8A Poseidon Conducts Surveillance Over the Black Sea

On August 27, while NATO maritime patrol aircraft from the United States, Norway, the United Kingdom, and France were engaged in tracking Russian nuclear attack submarines in the Norwegian Sea, the US Navy deployed a P-8A Poseidon over the Black Sea from Sigonella Air Base in Sicily, Italy.

Routine Surveillance Missions in a Heightened Conflict

This type of mission is not unusual, especially since the onset of the Ukraine conflict. There have been instances where interceptions of intelligence aircraft, particularly American and British, by Russian fighters (such as the Su-27, Su-30, and Su-35S) have resulted in incidents or intimidation maneuvers.

For example, in October 2022, a Russian Su-27 fired an air-to-air missile near a Royal Air Force RC-135 Rivet Joint. However, during this particular flight, the P-8A Poseidon experienced no such incidents as it traversed the Black Sea from Varna, Bulgaria, to a point 50 nautical miles off the coast of Sochi, Russia, passing near Crimea.

Unique Aspects of the P-8A’s Mission

While the US Navy’s maritime patrol aircraft was intercepted by at least one Russian fighter, likely a Su-30 from a naval aviation unit based in Crimea, the distinctive feature of this mission was the sensors utilized by the aircraft.

Images from the interception, shared by the Telegram channel “@bomber_fighter,” associated with the Russian Aerospace Forces, revealed that the P-8A Poseidon was equipped with an AN/APS-154 Advanced Airborne Sensor (AAS) mounted beneath its forward fuselage. This marks the first observed instance of this sensor being deployed over the Black Sea.

Technical Specifications of the AN/APS-154 AAS

The AAS is integrated onto the P-8A Poseidon using a hydraulically operated mechanism known as the Special Mission Pod Deployment Mechanism (SMPDM).

The meeting between a Russian Sukhoi fighter jet and U.S. Navy Boeing P-8A Poseidon maritime patrol aircraft/ASW plane over the Black Sea. Video reportedly from today.

The P-8A is equipped with the AN/APS-154 Advanced Airborne Sensor multifunctional AESA radar, deployed under… pic.twitter.com/F6xo80Hyq4

— Status-6 (Military & Conflict News) (@Archer83Able) August 27, 2025

Capabilities and Applications of the AN/APS-154 AAS

Developed by Raytheon since 2009 to replace the AN/APS-149 Littoral Surveillance Radar System (LSRS) used on older P-3C Orion aircraft, the AN/APS-154 AAS features an Active Electronically Scanned Array (AESA) radar, Synthetic Aperture Radar (SAR), and Ground Moving Target Indicator (GMTI) capabilities for both terrestrial and maritime targets. It is also possible that it possesses electronic warfare capabilities.

The exact performance metrics of the AN/APS-154 AAS remain classified; however, it is known to provide 360-degree coverage over several hundred kilometers and can map terrain with high precision using its SAR. Depending on the mission profile, it is likely that the P-8A Poseidon aimed not only to identify vessels at sea but also to gather intelligence on the Russian fleet in the Black Sea, which has relocated to Novorossiysk following consistent targeting by Ukrainian forces on the Sevastopol base.

Photo: Capture d’écran