Under what condition can ATC omit time, fix, altitude, and contact information?

The correct condition under which Air Traffic Control (ATC) can omit time, fix, altitude, and contact information is when compliance is expected upon request. This means that if ATC has a reasonable assurance that the pilot will follow the instructions provided without needing additional contextual information, they can streamline communication by omitting some details.

This approach is often utilized to enhance efficiency, especially in situations where the controller believes that the pilot is capable of managing their flight safely without the full scope of information. It relies on the assumption that pilots who are experienced or familiar with specific procedures or airspace can effectively operate under these conditions.

The other options do not accurately reflect the protocols concerning the omission of such critical information. High-traffic situations might necessitate more communication, not less, to ensure safety. A first-time flyer typically requires more guidance, not less, to assist them in navigating through potentially complex airspace. Lastly, whether a facility is well-known doesn't automatically justify omitting vital flight information, as it can vary significantly by situation.