When must students request a block altitude with the next sector?

Requesting a block altitude with the next sector is necessary after a handoff has been initiated. This is critical for maintaining coordination and ensuring that both sectors are aware of the intended altitude parameters for the aircraft. During this phase, the control responsibilities are transitioning, and it becomes essential for the controller to confirm with the next sector what the aircraft's block altitude will be. This helps in the effective management of air traffic and promotes safety and efficiency in communication between sectors.

The nature of air traffic control requires that alterations or confirmations of flight data occur when the aircraft is in the process of being handed off, allowing the incoming controller to prepare for receiving the aircraft at the specified altitude while ensuring there are no conflicts or issues with other traffic.