7500
Hijack
7600
RT Fail
7700
Emergency
0000
SSR data unreliable
0002
Transponder ground test
0010
Birmingham listening out
0020
Air ambulance (generic)
0027
FIR join
0024
Calibrator
0032
Police helicopter (generic)
0033
Para dropping
0036
Pipeline/powerline inspection (generic)
0037
Royal helicopter
0035
Selected helicopter flight (?)
7000
Conspicuity Code
7001
Military low level and climbout
7002
Danger areas general
7003
Red arrows display / transit
7004
Aerobatics and display
7005
High energy manoeuvres
7006
Autonomous operations within TRA
7010
Aerodrome traffic pattern
0030
FIR lost
0031
FIR found