Which entity assumes responsibility for control of air traffic when ATCT RADAR is out of service and CENRAP is not available?

When the ATCT (Air Traffic Control Tower) radar is out of service and CENRAP (Centralized Radar Approach) is unavailable, the responsibility for controlling air traffic is assumed by the Aero ARTCC (Air Route Traffic Control Center). This is because the Aero ARTCC is designed to provide radar control services for en-route traffic and is equipped to handle such situations when the local control capabilities are compromised.

The role of the Aero ARTCC includes managing the flow of air traffic over large geographic areas, coordinating with different sectors, and ensuring safe separation between aircraft. This capability is crucial in maintaining air traffic safety and efficiency during instances when localized control systems fail.

The other entities mentioned, such as specific ATCTs like Jackson or Monroe, are typically responsible for their immediate airspace but do not have the jurisdiction to assume control over broader en-route traffic when central systems are down. Similarly, FAA Headquarters does not directly manage air traffic control; instead, it oversees the regulations and policies governing the operation of air traffic control facilities. Hence, the Aero ARTCC is the appropriate entity to take responsibility in this scenario.