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:
|Set the transponder code "1234"
|Reset squawk "1234"
|Reset the previously issued code "1234"
|Turn on the function IDENT
|Squawk standby (STBY)
|Operate your transponder in the standby mode
|Confirm your squawk, read your squawk
|Turn off the transponder
|Change the transponder mode to Alpha/Charlie/sierra
|Squawk 7000 in most European countries
Squawk 1200 in North America
|Set the emergency code 7700 on your transponder
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
188.8.131.52 To request transmission of pressure-altitude
b) TRANSMIT ADS-B ALTITUDE.
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