What steps must be taken if an aircraft attempts another approach or requests to hold?

When an aircraft attempts another approach or requests to hold, it is crucial to post a new strip. This step ensures that all relevant information about the aircraft's revised intentions is updated and clearly indicated on the radar display. The new strip reflects current flight details, including the new approach sequence or hold instructions, which is essential for maintaining situational awareness and for effective air traffic management.

Posting a new strip also helps in preventing any potential miscommunication or confusion that could arise from relying on outdated information. Each strip serves as a visual representation of a flight's status, and when an aircraft's intentions change, updating this documentation is vital to ensure accuracy and safety.

In situations where an aircraft is making changes, monitoring without action, contacting for information, or continuing with the existing strip may not provide the necessary clarity or safety oversight required in air traffic control, which is why posting a new strip is the most appropriate response.