What is the minimum visibility requirement for an IFR flight?

For IFR (Instrument Flight Rules) flight operations, visibility requirements can vary significantly based on the type of airspace and the specific approach procedures being used. Unlike VFR (Visual Flight Rules) operations, where specific visibility minimums like a certain number of miles are universally applicable, IFR operations are more nuanced.

In controlled airspace, the visibility and cloud clearance requirements can differ; for example, in Class B airspace, pilots must remain clear of clouds with specific visibility requirements, while in Class C and D airspace, other regulations apply. Additionally, when executing approaches, the minimum visibility required could depend on whether the approach has specific published minimums that are influenced by factors like weather, aircraft type, and operation being performed.

Thus, saying that there is no specific visibility requirement and that it depends on airspace and approach reflects the regulatory nuances that IFR flights must adhere to, making it the correct answer. This understanding is crucial because it emphasizes the importance of being aware of the specific regulations that govern different flight situations, ensuring compliance with aviation safety standards.