On April 1, 2001, the EP-3 (BuNo "156511"), assigned to Fleet Air Reconnaissance Squadron One (VQ-1, "World Watchers"), had taken off as Mission PR32 from Kadena Air Base in Okinawa, Japan. At about 9:15 a.m. local time, toward the end of the EP-3's six-hour ELINT mission, it was flying at and , on a heading of 110°, about away from the island. Two Chinese J-8s from Hainan's Lingshui airfield approached. One of the J-8s ("81192"), piloted by Lt. Cdr. Wang Wei, made two close passes to the EP-3. On the third pass, it collided with the larger aircraft. The J-8 broke into two pieces; the EP-3's radome detached completely and its No. 1 (outer left) propeller was severely damaged. Airspeed and altitude data were lost, the aircraft depressurized, and an antenna became wrapped around the tailplane. The J-8's tail fin struck the EP-3's left aileron, forcing it fully upright, and causing the U.S. aircraft to roll to the left at three to four times its normal maximum rate.