Practice question

What primary operational capability distinguishes Secondary Surveillance Radar (SSR) Mode S Enhanced Surveillance (EHS) from conventional Mode A/C radar?

  1. Mode S provides primary skin-paint reflection tracking without requiring an aircraft transponder
  2. Mode S automatically downlinks Downlinked Aircraft Parameters (DAPs), including selected altitude, true airspeed, magnetic heading, roll angle, and ground speed
  3. Mode S operates exclusively on infrared satellite uplinks
  4. Mode S eliminates the requirement for controllers to monitor vertical separation

Answer: B — Mode S automatically downlinks Downlinked Aircraft Parameters (DAPs), including selected altitude, true airspeed, magnetic heading, roll angle, and ground speed

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