Update on the aircraft that overflew Dong Yin Island. This aircraft, likely a Y-12 took off from a civilian airfield and entered blind spot of radar installed on Dong Yin Island. The aircraft was intermittently tracked by radar but was manually marked by radar operator as "noise" and thus removed from tracking, and thus the command to man anti-aircraft guns was never given.
Dong Yin's air defence is carried out by ROCA which are armed with T82 20mm anti-aircraft guns and Stinger missiles, guided by PSTAR radar. These radars are turned on three times a day keep them warm but are not otherwise turned on and searching. Upon detecting possible threat ROCAF is meant to notify ROCA and have the air defence go into 3 minute battle ready status. But since this aircraft was misidentified as noise the notification never came. ROCAF also have visual spotters but due to bad visibility on the day they did not notice the aircraft until it overflew them and the engine noise gave it away.
Dong Yin's air defence is carried out by ROCA which are armed with T82 20mm anti-aircraft guns and Stinger missiles, guided by PSTAR radar. These radars are turned on three times a day keep them warm but are not otherwise turned on and searching. Upon detecting possible threat ROCAF is meant to notify ROCA and have the air defence go into 3 minute battle ready status. But since this aircraft was misidentified as noise the notification never came. ROCAF also have visual spotters but due to bad visibility on the day they did not notice the aircraft until it overflew them and the engine noise gave it away.