What is the transponder requirement for flights operating in TMZ zones?

What is the transponder requirement for flights operating in TMZ zones?

• A. Mode S transponder required only for IFR
• B. No transponder requirement
• C. Only VFR flights need transponder
• D. SSR transponder capable of A and C or S

Answer: (D)

Transponder use in Transponder Mandatory Zones is about enabling ATC to identify and monitor aircraft within the zone. The aircraft must have an SSR transponder that can respond with Mode A and Mode C information, or Mode S. Mode A provides identification, Mode C adds altitude, and Mode S offers more precise identification and data. This combination lets ATC know who is in the TMZ and how high they are, for both IFR and VFR flights. So the required setup is an SSR transponder capable of A and C, or S. The other options fail because TMZ applies to all flights and requires a functioning transponder; simply having no transponder or having one limited to IFR or VFR only is not correct.

Transponder use in Transponder Mandatory Zones is about enabling ATC to identify and monitor aircraft within the zone. The aircraft must have an SSR transponder that can respond with Mode A and Mode C information, or Mode S. Mode A provides identification, Mode C adds altitude, and Mode S offers more precise identification and data. This combination lets ATC know who is in the TMZ and how high they are, for both IFR and VFR flights. So the required setup is an SSR transponder capable of A and C, or S. The other options fail because TMZ applies to all flights and requires a functioning transponder; simply having no transponder or having one limited to IFR or VFR only is not correct.