What is the latest time the first radio contact between the tanker and receiver should occur?

The recommended practice for establishing the first radio contact between the tanker and receiver is to do so 15 minutes prior to the Air Refueling Control Time (ARCT). This timing allows both aircraft to ensure that they are on the correct course, height, and speed for a successful rendezvous. It provides an opportunity for both parties to verify their readiness and to make any necessary adjustments before the actual refueling operation begins.

Having this communication ahead of the ARCT helps in coordinating the final details of the operation, reducing the potential for miscommunication during a critical and time-sensitive maneuver. This proactive approach is essential for safety and ensures both aircraft are prepared for the rendezvous.