smaller antenna, giving slightly reduced capabilities. APG-66J – configured for the Japanese F-4EJ upgrade program. APG-66NT – installed on US Navy T-39N aircraft for instruction of Student Naval Flight Officers. APG-66NZ – installed under the Project KAHU on New Zealands A-4 Skyhawk aircraft. APG-66SR APG-66SS APG-66T – multi-target track while scan variant. APQ-164 – designed for the US Air Force B-1 Lancer bomber, with a passive electronically scanned array. References Aircraft radars Military radars of the United States Northrop Grumman radars Radars of the United States Air Force Equipment of the United States Coast Guard Military electronics of the United States