How should a controller inform an aircraft expecting an altitude change?

When a controller is informing an aircraft expecting an altitude change, it is essential to communicate when the aircraft should anticipate receiving either the clearance for that change or a request for an altitude adjustment from another air traffic control facility. This proactive communication helps the pilot manage their expectations regarding altitude and ensures safe coordination between the aircraft and the air traffic control system.

By advising when to expect such a clearance, the controller effectively aids in the overall situational awareness of the pilot, allowing them to plan and prepare appropriately for the change in altitude, which is crucial for maintaining safe vertical separation from other aircraft.

This choice reflects a best practice in air traffic control, where clarity and anticipation are vital for safe and efficient operations. It underscores the collaborative nature of aviation communication, where both the controller and pilot play essential roles in ensuring safety in the airspace.