What time standard do air traffic controllers use?

What time standard do air traffic controllers use?

• A. Local Time
• B. Solar Time
• C. Coordinated Universal Time
• D. Greenwich Mean Time

Answer: (C)

Air traffic control relies on a single, globally shared time reference so everyone stays in sync no matter where they are. The standard used is Coordinated Universal Time, often called UTC or Zulu time in aviation communications. UTC is based on atomic time and does not change with daylight saving or local time zones, so flight plans, weather data, and controller instructions can be timestamped unambiguously across the world. Greenwich Mean Time is an older term that’s similar in concept, but aviation formally uses UTC as the standard. Local time and solar time would introduce confusion due to time zone differences and sun-based variations.

Air traffic control relies on a single, globally shared time reference so everyone stays in sync no matter where they are. The standard used is Coordinated Universal Time, often called UTC or Zulu time in aviation communications. UTC is based on atomic time and does not change with daylight saving or local time zones, so flight plans, weather data, and controller instructions can be timestamped unambiguously across the world. Greenwich Mean Time is an older term that’s similar in concept, but aviation formally uses UTC as the standard. Local time and solar time would introduce confusion due to time zone differences and sun-based variations.