Something strange always happens.
1.Why there is always a DUPE alarm when there should not happen ? But why therer is not a DUPE alarm when should have ?
2.When I working this morning ,there is an aircraft took off without an FDR ,then I try to make an radar tag for it ,but the system said "the FDR is already exists" ,but it did not !!!
3.Sometimes the system may lost the radar tag information only leave a 2nd radar surveillance information on radar or there is another same 2nd radar surveillance information flys along with a normal radar tag !!