If a pilot deviates from an ATC clearance due to a TCAS advisory, what is the expected action afterward?

Answer: C — Expeditiously return to the ATC clearance in effect prior to the advisory.

When a pilot deviates from an ATC clearance due to a TCAS (Traffic Collision Avoidance System) advisory, the expected action afterward is to expeditiously return to the ATC clearance in effect prior to the advisory. This is important because, while TCAS provides vital information for avoiding potential collisions, ATC clearance ensures the safe and orderly flow of air traffic. Following a TCAS advisory, the pilot's immediate priority is to ensure safety by complying with the avoidance maneuver prompted by TCAS, but they must also strive to resume their previously assigned route and altitude as soon as it is safe to do so. This helps maintain the integrity of the air traffic system and minimizes disruption to other aircraft. Once the situation demands deviation, notifying ATC of the action taken may be necessary after returning to the cleared path, but the primary and immediate obligation is to align back with the ATC instructions as soon as possible while ensuring the safety of the flight. By doing so, the pilot not only enhances safety during their own flight but also minimizes any potential disruption to others in the controlled airspace.