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When an aircraft carries a serviceable Mode C transponder, the pilot shall continuously operate this mode…

  • A
    regardless of ATC instructions for another mode.
  • B
    only when directed by ATC.
  • C
    unless otherwise directed by ATC.
  • D
    only when the aircraft is flying within controlled airspace.

ICAO Doc 8168
Chapter 1. OPERATION OF TRANSPONDERS

1.1.3 When the aircraft carries serviceable Mode C equipment, the pilot shall continuously operate this mode, unless otherwise directed by ATC.

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