Before penetrating another controller's airspace, what action is required?

• A. Wait until entering the area is complete
• B. Enter immediately
• C. Coordinate with the other controller
• D. Ask the pilot

Answer: (C)

When you plan to enter airspace controlled by another facility, you must coordinate with that controller before you penetrate their sector. This ensures they’re aware of your position, intended route, altitude, and when you’ll be handing off to their control. Coordinating allows the receiving controller to manage traffic, provide appropriate instructions, and maintain safe, orderly separation from other aircraft. Without this coordination, there can be confusion about who is responsible for the aircraft and where it should be cleared, increasing the risk of conflicts.

Saying you’ll just enter or that the pilot should handle it isn’t correct because the authority and responsibility for sequencing and separation lie with the controllers, not the pilot. Waiting until after entry or attempting to proceed without telling the other controller can lead to loss of coordination and unsafe situations.