What standard practice must pilots follow when entering controlled airspace?

When entering controlled airspace, pilots must communicate with Air Traffic Control (ATC) for approvals. This standard practice is essential because controlled airspace is designated to ensure the safe and orderly flow of air traffic. ATC provides instructions and clearances that help pilots avoid conflicts with other aircraft and maintain safe separation. Proper communication with ATC enables pilots to receive vital information, such as traffic advisories, updates on weather, and any restrictions in the area. This interaction is critical to maintaining safety in the busy environments typically associated with controlled airspace.

In contrast, flying at high speeds, maintaining visual contact with landmarks, or avoiding navigation instruments do not align with the requirements for safely operating in controlled airspace. High speeds may not necessarily be safe or allowed, visual contact with landmarks isn’t typically practical or reliable in all conditions, and not utilizing navigation instruments can lead to disorientation and potential hazards.