What is NOT a reason for issuing control instructions without communication?

Issuing control instructions without communication typically occurs under specific conditions where it is necessary to ensure safety, efficiency, and coordination in traffic management. The reasoning behind the correct answer relates to the purpose and implications of using such a method.

When addressing the expedited flow of busy traffic, controllers may employ procedures that allow for streamlined operations. This can include issuing control instructions without direct communication to facilitate ongoing movement effectively. However, one must consider that when safety or coordination is compromised—such as in cases where not all affected controllers have coordinated, a separation requirement remains in effect, or there has been a failure to agree on altitude changes—the need for clear communication and acknowledgment becomes paramount.

In essence, expediting busy traffic is a goal of air traffic management and does not inherently justify bypassing communication protocols when critical safety or coordination issues are at play. Effective communication remains vital, particularly in complex or busy airspace environments. Therefore, the act of issuing control instructions without adequate communication cannot be justified solely on the basis of expediting operations when other critical factors require attention and coordination among controllers.