Which action is necessary when an aircraft is 'CLEARED TO HOLD'?

When an aircraft is 'CLEARED TO HOLD,' it means that the pilot has received instructions to enter a holding pattern at a specified point. This clearance includes details about the location (such as a waypoint or fix) and the specific holding instructions, including the turn direction and altitude if applicable. Holding patterns are established to manage air traffic and provide space for aircraft to wait for further instructions, often due to traffic congestion or runway unavailability.

The requirement to follow the instructions and hold at a specified point ensures safety and order in busy airspace, allowing air traffic control to manage multiple aircraft efficiently. This is a critical procedure within air traffic control operations, enabling flights to maintain safe separation while pending further clearance for landing or other instructions.

Other options may imply less accurate or inappropriate actions in response to a holding clearance, neglecting the specific protocols established for managing aircraft in this situation.