First of all, the pilot has obtained these frequencies from the data in the preparation stage before the flight, and he has to carry these frequencies throughout the flight. Control is divided into many seats: ground, tower, departure, route, approach, approach and so on.
Before taking off, you must find the frequency on the airport map and dial:
Pilot: Jinan ground, China Southern Airlines 835, good morning.
Jinan ground: China Southern Airlines 835, go ahead.
……
Every time the frequency changes, the previous seat will tell the pilot the frequency of the next seat, for example:
Pilot: Jinan Tower, China Southern Airlines 835, requesting takeoff.
Tower: China Southern Airlines can take off at 8: 35. Please contact the departure office after take-off. Turn at eight o'clock
The pilot repeated: you can take off, take off in contact, turn at 2: 08, and China Southern Airlines is 835.
The upper left corner of the orly airport instrument approach chart is the frequency.
Just like a walkie-talkie, you can only receive or send on one frequency. All planes on this frequency can hear it, but the call is usually one-to-one. If there are too many frequencies, the plane will be very chaotic, so the big airport is divided into several seats and several frequencies.
Emergency situation:
Pilot: SOS, SOS, SF 153, Blablablabla…… ...
Control: All stations, stop transmission and call for help.
……
(Pilot: Mayday Mayday, SF 153. ...
Control: all units stop reciting, there is an emergency. )
All civil aviation pilots in China must be fluent in Chinese and English.