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When in contact with Lille Approach on 118.550 MHz, a pilot receives an odd transmission: "One two three four, Lille Approach". What is the reason for this transmission?
  • A
    Lille Approach is asking all stations to change frequency to 123.400 MHz.
  • B
    Lille Approach has just conducted a test transmission.
  • C
    Lille Approach is receiving a call from another station called “One two three four”.
  • D
    Lille Approach has just provided a time check to all stations.

ICAO Doc 9432 - Manual of Radiotelephony
2.8.4 Test procedures

2.8.4.4 When it is necessary for a ground station to make test signals, either for the adjustment of a transmitter before making a call or for the adjustment of a receiver, such signals shall not continue for more than 10 seconds and shall be composed of spoken numbers (ONE, TWO, THREE, etc.) followed by the radio call sign of the station transmitting the test signals.

Note: This question is referring to a test made for maintenance reasons rather than a readability check. It is made between controllers and technicians and shall not be answered by pilots.

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