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The controller instructs you to "SQUAWK CHARLIE". What does that mean?.The controller...
  • A
    wants you to switch off your transponder.
  • B
    is informing you that he/she can only determine your bearing within 10 degrees.
  • C
    is requesting transmission of your pressure altitude from your transponder.
  • D
    is unable to see your aircraft on his/her primary radar.

The instruction to set the transponder code for the first time is expressed with a very simple phrase, the word squawk followed by the appropriate code shall be transmitted.

Please find SSR transponder related phraseology below:
Phraseology Meaning
Squawk "1234" Set the transponder code "1234"
Reset squawk "1234" Reset the previously issued code "1234"
Squawk IDENT Turn on the function IDENT
Squawk standby (STBY) Operate your transponder in the standby mode
Confirm squawk Confirm your squawk, read your squawk
Stop squawk Turn off the transponder
Squawk Alpha/Charlie/Sierra Change the transponder mode to Alpha/Charlie/sierra
Squawk VFR Squawk 7000 in most European countries
Squawk 1200 in North America
Squawk Mayday Set the emergency code 7700 on your transponder
Alpha/Charlie/Sierra:
Mode A: Only transmits position information.
Mode C: Transmits postion and altitude information (minimum requirement for TCAS RA)
Mode S: The transponder sends information to the TCAS systems of other aircrafts.
  • In this case, "SQUAWK CHARLIE" => used to request transmission of pressure-altitude.

ICAO Doc 4444
12.4.3 Secondary surveillance radar (SSR) and ADS-B phraseologies

12.4.3.11 To request transmission of pressure-altitude
a) SQUAWK CHARLIE;
b) TRANSMIT ADS-B ALTITUDE.

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