JO 7110.65 5-4-1

To provide continuous radar service to an aircraft and facilitate a safe, orderly, and expeditious flow of traffic, it is often necessary to transfer radar identification of an aircraft from one controller to another. This section describes the terms, methods, and responsibilities associated with this task. Interfacility and intrafacility transfers of radar identification must be accomplished in all areas of radar surveillance except where it is not operationally feasible. Where such constraints exist, they must be:

Covered in letters of agreement which clearly state that control will not be based upon a radar handoff, or

Coordinated by the transferring and receiving controllers for a specified period of time. REFERENCE-

FAA Order JO 7110.65, Para 4-3-8 , Coordination with Receiving Facility.