What must a pilot do if they deviate from ATC instructions?

When a pilot deviates from ATC instructions, the most critical action is to report the deviation to ATC as soon as possible. This is essential for maintaining safety and efficient air traffic management. ATC relies on accurate and timely information to manage the airspace and ensure the safety of all aircraft. By notifying ATC of a deviation, the pilot allows air traffic controllers to adjust their plans accordingly, which helps prevent potential conflicts with other aircraft and maintains situational awareness for all parties involved.

This immediate communication is a fundamental aspect of the pilot-controller relationship, emphasizing the importance of collaboration in maintaining the safety of flights. It also reflects adherence to regulatory requirements and standard operating procedures within aviation. The responsibility to keep ATC informed underlines the importance of vigilance and transparency in aviation operations.