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357 - ATPL - Interception. An aircraft which is intercepted by another aircraft shall immediately attempt to establish radio-communication with the intercepting aircraft or with the appropriate intercept control unit, by making a general call on the frequency

Question 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.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license