Which component, if lost, would pose the most risk to safety of flight?

• A. Transponder
• B. GPS
• C. Autopilot
• D. Radar

Answer: (D)

Radar is central to maintaining real-time situational awareness because it provides both weather detection and traffic surveillance that you and air traffic control rely on to keep separation and avoid hazards. If radar is unavailable, you lose the primary means to see where other aircraft are in the vicinity and to steer clear of storm cells, which dramatically increases the risk of a mid-air collision or weather-related problems.

Other systems enhance safety but have workable alternatives: GPS can be supplemented by traditional navigation aids, autopilot reduces pilot workload but can be hand-flown if needed, and a transponder helps ATC identify you and TCAS warn of nearby traffic, but none offer the same immediate, two-way visibility of traffic and weather that radar provides. Therefore, losing radar presents the greatest safety risk.