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IFR knowledge

4.82.8 How ATC will verify the transmission of a 7500 Transponder Code.

1. Controller Verifies 7500
  • Controller will attempt to verify by radio
  • that the code selection is intentional
  • “ ... (CALL SIGN) ... CONFIRM SQUAWKING SEVEN FIVE ZERO ZERO"
2. Reply
  • If  reply is "Affirmative" or if No Reply received,
  • this indicates the aircraft is subjected to unlawful interference.