Which class represents all uncontrolled airspace with no ATC authority, where ATS provides flight information services?

Which class represents all uncontrolled airspace with no ATC authority, where ATS provides flight information services?

• A. Class B
• B. Class C
• C. Class E
• D. Class G

Answer: (D)

Uncontrolled airspace with no ATC authority is Class G. In this space, ATC does not provide traffic control or separation services; pilots manage their own separation using see-and-avoid, weather, and aeronautical information. ATS can still offer flight information services, such as weather updates and notices to airmen, to help pilots operate safely, but they do not issue clearances or control traffic. The other classes are controlled—ATC has authority to issue clearances and provide separation for IFR (and often some VFR) traffic—so they don’t match the description of having no ATC authority.

Uncontrolled airspace with no ATC authority is Class G. In this space, ATC does not provide traffic control or separation services; pilots manage their own separation using see-and-avoid, weather, and aeronautical information. ATS can still offer flight information services, such as weather updates and notices to airmen, to help pilots operate safely, but they do not issue clearances or control traffic. The other classes are controlled—ATC has authority to issue clearances and provide separation for IFR (and often some VFR) traffic—so they don’t match the description of having no ATC authority.