First flight 18 June 1991 from Palmdale to Edwards AFB. Operational with 6520th TS / 6510th TW (to 420th TS / 412th TW on 02 October 1992). First aircraft with complete avionics. Used for radar, navigation, offensive and defensive systems testing: February 1993 tested Northrop ZSR-63 defensive avionics suite; November 1993 tested Hughes AN/APQ-181 LPI (Low-Probability-of-Intercept) radar. Named Spirit of New York on 10 October 1997, but remained at Edwards for testing. It spent most of 2002 being upgraded to Block 30 standard.