Mode C
A transponder mode that reports pressure altitude to ATC and TCAS in addition to the discrete code, enabling automatic altitude readout. Mode C (or S) is required in much controlled and high-altitude airspace.
Related terms
A transponder mode that reports pressure altitude to ATC and TCAS in addition to the discrete code, enabling automatic altitude readout. Mode C (or S) is required in much controlled and high-altitude airspace.