AMA 2013-2014 CL Competition Regulations, 2. General: The use of 2.4 GHz (utilizing spread spectrum, 47 CFR Part 15) radio control to accomplish functions other than providing aerodynamic control of the model’s elevation on Control Line models is allowed, but only to the extent and in the manner specifically allowed by the rules of the individual event. All control functions must be under the direct control of the pilot and only the pilot.