How should the transponder operate when the aircraft is on the ground?
When switched-on, on the ground, the transponder will respond only to selective addressing. This is important at aerodromes where Advanced Surface Movement Guidance and Control Systems (A-SMGCS), based on Mode S multilateration, are being used. Flight crew should make themselves aware of any detailed on-the-ground Mode S transponder operating instructions promulgated by such aerodromes. See also www.eurocontrol.
