Scale: 1/72
Wingspan: 9"
Length: 11.75"
Code: CS3TR

Upgraded avionics, AN/APS-137 inverse synthetic aperture radar, Joint Tactical Information Distribution System, AGM-84 Harpoon launch capability, first flight 13 September 1984, 119 converted from S-3As. Starting in 1991, some of these were upgraded to the S-3B with a number of new sensors, avionics, and weapons systems, including the capability to launch the AGM-84 Harpoon anti-ship missile.

The S-3B can also be fitted with "buddy stores" external fuel tanks that allow the Viking to refuel other aircraft. 16 S-3As were converted to ES-3 Shadows for carrier-based electronic intelligence (ELINT) duties. One aircraft, designated US-3A, was also converted for utility and limited cargo duty. Plans were also made to develop the KS-3A carrier-based tanker aircraft to replace the retired KA-6 but this program was ultimately cancelled after the conversion of just one early development S-3A.