Which transponder mode is acceptable in Turkish controlled airspace?

Which transponder mode is acceptable in Turkish controlled airspace?

• A. Mode A/C or Mode S
• B. Mode A only
• C. Mode C only
• D. Mode S only

Answer: (A)

Altitude reporting to ATC is what Turkish controlled airspace relies on for safe separation and identification. A transponder that only transmits a simple identity code (Mode A) doesn’t provide altitude information, so it isn’t suitable for controlled airspace. Transponders that do provide altitude data—Mode A with altitude reporting via Mode C (often referred to as Mode A/C) or Mode S—meet the requirement. Mode S also offers additional data and capabilities beyond altitude, but both options give the necessary altitude information. That’s why the acceptable choice is Mode A/C or Mode S.

Altitude reporting to ATC is what Turkish controlled airspace relies on for safe separation and identification. A transponder that only transmits a simple identity code (Mode A) doesn’t provide altitude information, so it isn’t suitable for controlled airspace. Transponders that do provide altitude data—Mode A with altitude reporting via Mode C (often referred to as Mode A/C) or Mode S—meet the requirement. Mode S also offers additional data and capabilities beyond altitude, but both options give the necessary altitude information. That’s why the acceptable choice is Mode A/C or Mode S.