Domanda 357, Air Law - ATPL - Airline Transport Pilot license

121.5 MHz. If no contact has been established, and if practicable, repeat this call on the frequency 243 MHz.
243 MHz. If no contact has been established, and if practicable, repeat this call on the frequency125.5 MHz.
121.5 MHz. If no contact has been established, and if practicable, repeat this call on the frequency282.8 MHz.
121.5 MHz. If no contact has been established, and if practicable, repeat this call on the frequency125.5 MHz.