What actions are taken when an aircraft deviates from its assigned altitude?

When an aircraft deviates from its assigned altitude, several actions are taken by both the pilot and air traffic control (ATC) to ensure safety and prevent potential conflicts with other aircraft. The pilot's initial action should be to recognize the deviation and immediately take corrective action to return to the assigned altitude. The pilot should also notify ATC as soon as possible about the deviation, providing the magnitude and direction of the altitude change. This notification allows ATC to assess the situation and take appropriate measures to maintain separation from other aircraft. Upon receiving notification of an altitude deviatio....