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On which of the following frequencies can a pilot expect to be contacted by ATS in case of an emergency? Assume that communication attempts on the frequency in use have been without success.
  • A
    121.5 MHz
  • B
    122.5 MHz
  • C
    234.0 MHz
  • D
    243.0 kHz
  • 121.5 MHz: International Aeronautical Emergency Frequency. This frequency should always be used first. If such frequency does not help, the pilot should use the emergency frequency 243 MHz (NATO Combined Distress and Emergency Frequency).

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