What role does an ARTCC play regarding previously approved ALTRVs?

An ARTCC (Air Route Traffic Control Center) plays a crucial role in managing air traffic, particularly concerning previously approved ALTRVs (Alternate Routes for air traffic). When dealing with ALTRVs, the ARTCC is responsible for notifying approach control facilities about the approved alternate routes. This communication ensures that the approach control facilities are aware of any changes or authorizations related to an aircraft's routing, allowing them to effectively manage and direct incoming traffic.

This system helps to maintain safety and efficiency in the airspace system by ensuring all relevant facilities are updated with the latest information regarding aircraft movements, especially when deviations from normal flight paths occur due to various operational needs. Notifying approach control is essential as it aids in coordinating the safe landing and sequencing of aircraft arriving at airports.

The other options do not accurately represent the primary functions of the ARTCC in relation to ALTRVs. Processing departure requests and notifying flight plans do not involve the specific responsibilities associated with ALTRV management, and issuing weather reports fall outside the ARTCC's role in directly handling air traffic routing procedures.