When an aircraft crosses the boundary in a climb/descent, what should ZAE initiate?

When managing an aircraft that is crossing a boundary in a climb or descent, it is essential to initially initiate the handoff to the next controlling entity. This ensures that the aircraft is properly transferred to the appropriate air traffic control (ATC) facility responsible for that airspace.

Following the initiation of the handoff, it's important to issue an APPREQ for the climb or descent. This request serves to inform the receiving controller of the aircraft's intended vertical movement and confirms whether the climb or descent can be approved based on traffic and airspace conditions. This procedure is crucial because it helps maintain safety and efficiency in the management of air traffic, allowing the next controller to be aware of any potential conflicts or restrictions.

In contrast, notifying the pilot of boundary restrictions or clearing the aircraft for descent immediately might not align with standard procedural protocols, as these actions should only occur after proper coordination has taken place and the appropriate approvals have been obtained. Additionally, providing traffic advisories could be part of the process post-handoff, but it is not the first step in response to an aircraft crossing a boundary.