How should a pilot establish contact with an EFAS station?

To establish contact with an EFAS (Enroute Flight Advisory Service) station, a pilot should call Flight Watch on 122.0. This frequency is specifically designated for providing flight weather advisories to pilots in flight, which is a primary function of the EFAS stations. Contacting Flight Watch on this frequency allows the pilot to receive critical updates about weather conditions, NOTAMs (Notices to Airmen), and other pertinent information for their routing.

The other options correspond to different communication functions. For example, 119.0 is typically used for flight service stations, while 121.5 is the international emergency frequency and is reserved for emergency communications. 123.0 is also commonly used for non-movement areas or for inter-aircraft communication, not for EFAS. By choosing 122.0, pilots ensure they are reaching the right service intended for their enroute safety and situational awareness.