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.[3][11]