What is the only type of aircraft that can present a single-arc IFF reply on a scope?

What is the only type of aircraft that can present a single-arc IFF reply on a scope?

• A. Civilian
• B. Commercial
• C. Unmanned
• D. Military

Answer: (D)

Interrogating an IFF transponder is how radar systems quickly confirm friend or foe. Military IFF, especially in its secure modes, is designed to provide distinctive identification on the radar display. The single-arc reply is a display cue associated with those military IFF responses, setting them apart from other transponder replies. Civilian and commercial transponders (standard A/C/S responses) produce normal blips and do not generate that single-arc signature on the scope. So, the only type of aircraft that can present a single-arc IFF reply on a scope is military.

Interrogating an IFF transponder is how radar systems quickly confirm friend or foe. Military IFF, especially in its secure modes, is designed to provide distinctive identification on the radar display. The single-arc reply is a display cue associated with those military IFF responses, setting them apart from other transponder replies. Civilian and commercial transponders (standard A/C/S responses) produce normal blips and do not generate that single-arc signature on the scope. So, the only type of aircraft that can present a single-arc IFF reply on a scope is military.